halstrup walcher PUC28 Differential Pressure Monitors For Clean Room Instruction Manual

PUC28 Differential Pressure Monitors For Clean Room

Instruction Manual PUC 28 Process monitoring device for clean rooms

Document 7100.004424B 12/2019

halstrup – walcher GmbH
Stegener Straße 10 D-79199 Kirchzarten
Tel.: +49 (0) 76 61/39 63-0 Fax: +49 (0) 76 61/39 63-99
E-Mail: info@halstrup-walcher.com Internet: www.halstrup-walcher.com

Instruction Manual PUC 28
Table of Contents:
1 Validity and purpose of the instruction manual………………………………………………………….. 4 2 Safety precautions……………………………………………………………………………………………….. 5
2.1 Appropriate use ………………………………………………………………………………………………. 5 2.2 Shipping, assembly, electrical connections and start-up………………………………………… 5 2.3 Troubleshooting, maintenance, repairs, disposal ………………………………………………….. 5 2.4 Symbols ………………………………………………………………………………………………………… 6 3 Device description ……………………………………………………………………………………………….. 7 3.1 General functional description …………………………………………………………………………… 7 3.2 Cyclic zero-point calibration………………………………………………………………………………. 8 3.3 Display of measured values………………………………………………………………………………. 8 3.4 Display and controls ………………………………………………………………………………………… 9 3.5 Manual zero-point calibration…………………………………………………………………………….10 3.6 Re-Calibration ………………………………………………………………………………………………..10 3.7 Connections …………………………………………………………………………………………………..10 4 Assembly……………………………………………………………………………………………………………12 5 Setting the parameters …………………………………………………………………………………………13 5.1 Abbreviations used ………………………………………………………………………………………….14 5.2 Basic settings [ SETTINGS ]……………………………………………………………………………..15
5.2.1 Language [ SETTINGS / LANGUAGE ] ………………………………………………………….15 5.2.2 Changing the password [ SETTINGS / NEW PASSWD ]…………………………………..15 5.2.3 Measurement range of the internal pressure sensor [ SETTINGS / MEAS. RANGE ]……………………………………………………………………………………………………………………….15 5.2.4 External sensors (IN1 and IN2) [ SETTINGS / CONF. EXTERN ] ………………………16 5.2.5 Display [ SETTINGS / DISPLAY ]………………………………………………………………….16 5.2.6 Signal [ SETTINGS / SIGNAL ] …………………………………………………………………….17 5.2.7 Acoustic signalling device [ SETTINGS / SOUND ] ………………………………………….17 5.2.8 Decimal places display [ SETTINGS / DECIMAL PL. ] ……………………………………..17 5.2.9 Delete Re-Calibration [ SETTINGS / UNDO TEACH ] ………………………………………18 5.2.10 Reset the device [ SETTINGS / RESET ] ……………………………………………………..18 5.2.11 Recall the delivery state [ SETTINGS / DELIVERY ST. ]…………………………………18 5.3 Scaling and limits [ VALUES ]……………………………………………………………………………18 5.3.1 Scaling [ VALUES / SCALE ]………………………………………………………………………..19 5.3.2 Limits [ VALUES / WARNING ]……………………………………………………………………..19 5.4 Filter setting [ FILTER ]…………………………………………………………………………………….21 5.5 Relays [ RELAY ]…………………………………………………………………………………………….22
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Instruction Manual PUC 28 5.5.1 Switching conditions and relay test [ RELAY / COND. TEST ]……………………………22 5.5.2 Relay activation and deactivation delays [ RELAY / TIME REL. ] ……………………….23 5.5.3 Alarm acknowledgement [ RELAY / ACKNOWLEDGE ]……………………………………24 5.6 Re-Calibration [ TEACH ] ……………………………………………………………………………….24 6 RS232 Interface…………………………………………………………………………………………………..26 6.1 List of RS232 commands …………………………………………………………………………………26 6.1.1 Commands for Configuration………………………………………………………………………..26 6.1.2 Commands for reading the measured values and the status values……………………29 6.1.3 Other commands………………………………………………………………………………………..30 6.2 Error codes…………………………………………………………………………………………………….32 6.3 Assignment of the RS232 connector ………………………………………………………………….33 6.4 Interface configuration ……………………………………………………………………………………..34 6.5 Configuration software……………………………………………………………………………………..34 7 Profibus DP interface……………………………………………………………………………………………38 7.1 Profibus DP address ……………………………………………………………………………………….38 7.2 Terminating resistors ……………………………………………………………………………………….38 7.3 Modules…………………………………………………………………………………………………………39 7.4 Setting the parameters of the PUC 28 as a Profibus slave …………………………………….41 7.5 Assignment of the Profibus connector ………………………………………………………………..42 8 Adjusting the PUC 28 [ TEACH ] ……………………………………………………………………………43 8.1 Adjusting the internal pressure transmitter…………………………………………………………..43 8.2 Adjusting the analogue inputs and outputs ………………………………………………………….44 9 Care instructions for PUC 28 …………………………………………………………………………………44 10 Technical data …………………………………………………………………………………………………..45 11 Troubleshooting…………………………………………………………………………………………………46 12 Dimension drawing …………………………………………………………………………………………….47 13 Menu tree …………………………………………………………………………………………………………48 14 Ranges of values and default settings …………………………………………………………………..51
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Instruction Manual PUC 28
1 Validity and purpose of the instruction manual
This instruction manual applies to the PUC 28 starting with software version 3.6. The instruction manual explains the operation and handling of the process monitoring device. Improper use of this device or failure to follow these instructions may cause injury to people or equipment damage. Every person who uses this device must therefore read the manual and understand the possible risks. The instruction manual, and in particular the safety precautions contained therein, must be followed carefully. Contact the manufacturer if you do not understand any part of this instruction manual. Handle this instruction manual with care:
It must be readily available throughout the lifecycle of the device. It must be provided to any individuals who assume responsibility for operating the
device at a later date. It must include any supplementary materials provided by the manufacturer. The manufacturer reserves the right to continue developing this device model without documenting such development in each individual case. The manufacturer will be happy to determine whether this manual is up-to-date.
Conformity
This device is state of the art. It complies with the legal requirements of EC directives. This is shown by the CE mark.
© 2010
The manufacturer owns the copyright to this instruction manual. It contains technical data, instructions and drawings detailing the device’s features and how to use it. It must not be copied either wholly or in part or made available to third parties.
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Instruction Manual PUC 28
2 Safety precautions
2.1 Appropriate use
The PUC 28 is used to test pressure, temperature and humidity.
Always observe the operating requirements — particularly the permissible supply voltage — indicated on the rating plate and in the “Technical data” section of this manual.
The device may only be handled as indicated in this manual. Modifications to the device are prohibited. The manufacturer is not liable for damages caused by improper use or failure to follow these instructions. Violations of this type render all warranty claims null and void.
2.2 Shipping, assembly, electrical connections and start-up
Do not close the pressure ports during shipping. Changes in barometric pressure may damage devices with low measurement ranges.
Assembly and the electrical connections should only be handled by professionals. They should be given proper training and be authorized by the operator of the facility.
The instrument may only be operated by appropriately trained individuals who have been authorized by the operator of the facility.
The functional test must not be performed using compressed air or breath because otherwise devices with low measurement ranges could be damaged.
Measurement errors may occur if the instrument is not kept protected from sunlight. Specific safety precautions are given in individual sections of this manual.
The first step is to create a recess in the wall (approx. 232 x 132 mm) at the site of installation using the hole template provided. See section entitled “Assembly” for additional assembly steps.
The instrument must be grounded at the ground terminal.
2.3 Troubleshooting, maintenance, repairs, disposal
The individual responsible for the electrical connections must be notified immediately if the device is damaged or if malfunctions occur that cannot be corrected as indicated in the section entitled “Troubleshooting”.
This individual must take the instrument out of service until the malfunction has been corrected and ensure that it cannot be used unintentionally.
Always unplug the power cord before opening the device!
This instrument requires no maintenance. Only the manufacturer may perform repairs that require the housing to be opened.
The electronic components of the device contain environmentally hazardous materials and materials that can be reused. The device must therefore be sent to a recycling plant when you no longer wish to use it. Compliance with the environmental codes of your particular country is mandatory.
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Instruction Manual PUC 28

2.4 Symbols
This instruction manual uses the following symbols to emphasize references to the operation and hazards when using the system:
WARNING! This warns you of a potential hazard that could lead to bodily injury up to and including death if the corresponding instructions are not followed.
CAUTION! This warns you of a potential hazard that could lead to significant property damage if corresponding instructions are not followed.

INFORMATION! This indicates that the corresponding information is important for operating the device properly.

[ ]

MENU PATH: In section 5 (entitled “Setting the parameters”), the menu paths are shown using brackets (e.g., [ VALUES / WARNING ]).

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Instruction Manual PUC 28
3 Device description
3.1 General functional description The PUC 28 is a microprocessor-controlled process monitoring device designed for use in clean rooms. It has one internal differential pressure sensor and two analogue inputs (0 … 10 V and 0 (4) … 20 mA each) for connecting external sensors. One temperature and one humidity sensor or two additional pressure sensors may be connected to these two ports. The signal of the internal pressure sensor can be provided by way of the OUT output as a current or voltage value (0 … 10 V and 0 (4) … 20 mA). The pressure which has to be measured has to be led to the two pressure input ports at the rear side. The three process values (e.g., pressure, temperature and humidity) are shown on the integrated display. At the same time, the limits, which can be set as parameters, are monitored and an acoustic alarm is triggered if a value moves outside its limits. In addition, two relay contacts (changeover contacts) represent these alarm states (in some variants of the PUC 28 these relay contacts are not present). These contacts may be used, for example, to drive external signal devices (strobe light or horn) or to feed the alarm signal to a central building control system. As an option, confirming the alarm by way of the push of a key can be set as a parameter.
Fig. 1: Block diagram of the PUC 28
The PUC 28 can be supplied with a Profibus DP interface for connection to the central building control system. In this case, the PUC 28 is integrated into the Profibus as a slave. It is possible to read all values of the PUC via the Profibus or to use the PUC as a display and an evaluation device in that the process signals (Pressure/IN 1/IN 2) are not provided by way of the internal pressure sensor or the analogue inputs but rather via the Profibus. The parameters of the PUC 28 are set in a menu-driven manner using the four integrated keys (see section 5 entitled “Setting the parameters”) or using the Profibus.
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Instruction Manual PUC 28
The PUC 28 has an internal overpressure safeguard that protects the precision pressure measurement capsule from damage.
Optionally a connection of the PUC 28 via a serial RS232C interface is also possible, this allows configuring the PUC 28 (alternatively to the configuration with the help of the integrated keys in the front plate) as well as reading the measured values and triggering certain actions (e.g. zero-point calibration) with the help of a PC. A PC configuration software also addresses these functions, which might serve as a remote station to the PUC 28 with RS232 interface.
3.2 Cyclic zero-point calibration
External influences such as temperature, position or ambient pressure can shift the device’s zero point, i.e., the value displayed when the pressure ports are open. Calibration is the process by which the device automatically registers this shift and figures it into the currently displayed pressure. During this process, “CALIBRATION” appears in the top line of the display. Calibration is always performed after power is applied to the PUC 28. As the PUC 28 must frequently adjust to the ambient temperature after power is applied (e.g., a new installation), calibration is performed every 15 minutes in the following hour. After this, a cyclic calibration is performed every hour. If the PUC 28 is in the parameter mode, calibration is postponed until after the parameters are set.
During the zero-point calibration procedure, the PUC 28 does not react to the press of a key. In this case, please wait a few seconds until the end of the calibration procedure (e.g., confirmation of an alarm).
If the PUC 28 has an RS232 or Profibus DP interface, the cyclic calibration can be replaced by a calibration command as an alternative. This ensures that no measured values are lost during critical process phases because of a calibration procedure.
3.3 Display of measured values
The display is capable of showing three measured values:
1st line – pressure (measured by the internal pressure sensor) 2nd line – value of the signal present at the input IN1
(dependent on the sensor connected: temperature or pressure) 3rd line – value of the signal present at the input IN2
(dependent on the sensor connected: relative humidity or pressure)
If the signal wanders outside the set limits (alarm), the corresponding line alternates between displaying the measured value and a blinking arrow. The arrow pointing upward indicates that the upper limit has been exceeded. An arrow pointing downward indicates that the signal has dropped below the lower limit.
If the inputs IN1 and/or IN2 are not used, the corresponding lines can be blanked on the display (see section 5 entitled “Setting the parameters”). The internally measured pressure can also be blanked. In this case additionally no zero-point calibration takes place.
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Instruction Manual PUC 28
Fig. 2: Alternating display of the temperature and humidity showing that the values have dropped below the limits.
3.4 Display and controls
Pressure Temperature (optional) Humidity (optional)
Enter Scroll right Scroll up Menu
Fig. 3: Front of the PUC 28
The process monitoring device has an LCD display that can show three measured values. The integrated keys are used to confirm alarms and for the menu-driven setting of the parameters for the PUC 28. Functions are dynamically assigned to the keys.
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Instruction Manual PUC 28

3.5 Manual zero-point calibration
Additionally to the cyclic zero-point calibration (see section 3.2 entitled “Cyclic zero-point calibration”) the zero-point calibration can also be initiated at any time manually, as long as the device is in display mode. To start the calibration, press “Enter”. Thereon the question “Calibrate ?” with the selections “No” and “Yes” appears. By default, “No” is selected. Now with the keys “Scroll up” or “Scroll right” change to “Yes” and confirm with “Enter”. Then the zeropoint calibration will be started.

3.6 Re-Calibration
The device variant PUC 28/K has an additional pair of pressure input ports available at the front side, which can be used to re-calibrate the device if required. This function can only be called out of the main menu, therefore it is password protected (see section 5 entitled “Setting the parameters”). The positive range (0…100Pa resp. 0…250Pa) and the negative range (0…-100 Pa resp. 0…-250Pa) might be re-calibrated independently from each other. In case the positive range shall be re-calibrated, a reference pressure of +100Pa resp. +250Pa has to be applied from outside; in case the negative range shall be re- calibrated, a reference pressure of -100Pa resp. -250Pa has to be applied from outside.

3.7 Connections

Terminal 1
2
3 4 5 6 7 8 9 10 11 12 13 14

Connection description OUT I
OUT –
OUT U OUT EARTH IN2 I IN2 U IN2 IN2 + IN1 I IN1 U IN1 IN1 + GND VCC

Description Analogue current output (internal pressure sensor) Chassis ground for the analogue output (internal pressure sensor) Analogue voltage output (internal pressure sensor) Cable shield (internal pressure sensor) Analogue current input (humidity or pressure) Analogue voltage input (humidity or pressure) Chassis ground connection for IN2 +24VDC supply for IN2 Analogue current input (temperature or pressure) Analogue voltage input (temperature or pressure) Chassis ground connection for IN1 +24VDC power supply for IN1 PUC 28 chassis ground PUC 28 supply voltage (+24 V DC)

Table 1: Terminal assignment, control line connector

Use the “IN1 +” and “IN1 I” or the “IN2 +” and “IN2 I” connections if hooking up a sensor with a two-wire configuration. “IN1 +” (resp. “IN2 +”) is the supply of the sensor; “IN1 I” (resp. “IN2 I”) is the sensing input and the minus-pole of the sensor at the same time.

If the cable at the analog OUT connection is longer than 3 meters, a shielded cable must be used. The shield must be connected to the OUT EARTH connection.

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Instruction Manual PUC 28

Terminal 1 2 3 4 5 6 7

Connection description EARTH RL1_NO RL1_Common RL1_NC RL2_NO RL2_Common RL2_NC

Description Ground connection Normally open contact Common Normally closed contact Normally open contact Common Normally closed contact

Relay 1 Relay 2

Table 2: Terminal assignment, relay connector (in some variants of the PUC 28 the relay contacts and therefore also the relay connector are not present)

Pressure input port at rear side (input for measurement) +P – P

Description
Positive pressure Negative pressure

Pressure input port at front side (input for re-calibration) +P – P

Description
Positive pressure Negative pressure

(The input for re-calibration is only available at the device variants “PUC 28/K”.)

Table 3: Assignment of the pressure input ports

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Instruction Manual PUC 28

Terminal assignment of the RS232 interface:

For the RS232 interface there are two possibilities:

9-pole D-SUB-jack (female) (top view from outside):

5-pole M12-jack (female, A-encoded) (top view from outside):

Fig. 4: RS232 interface (9-pole D-SUB-jack, female or 5-pole M12-jack, female)
Terminal assignment: see section 6.3 entitled “Assignment of the RS232 connector”

Terminal assignment of the Profibus DP interface:

For the Profibus DP interface there are two possibilities:

9-pole D-SUB-jack (female) (top view from outside):

5-pole M12-jack (female, B-encoded) (top view from outside):

Fig. 5: Profibus DP interface (9-pole D-SUB-jack, female or 5-pole M12-jack, female)
Terminal assignment: see section 7.5 entitled “Assignment of the Profibus connector”
The PUC 28 variants with 9-pole D-SUB-jack differs to that effect, that the jack is either directly integrated in the housing or that it is located at the end of a flying leads cable which is lead out of the housing between both terminal connectors. PUC 28 variants with M12-jack are only available with flying leads cable.
4 Assembly
The first step is to create a recess in the wall (approx. 116 x 220 mm) at the site of installation using the enclosed hole template and to copy the drilling template. Afterwards all connections to the PUC 28 have to be established, then mount the PUC 28 in the recess of the wall.
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Instruction Manual PUC 28

5 Setting the parameters

Setting the PUC 28 parameters is menu-driven. The main menu is called using the “Menu” key. This is followed by a request to enter the password. As delivered, the password is set to “0000”. The password may be changed in the menu item “New password”. You may exit the menu at any time using the Menu key. If no key is pressed for about 2 minutes, the PUC 28 automatically returns to the display mode. If you exit the menu and call it again within 2 minutes, the password is not requested again. In the following sections, the individual menu items are explained in detail in the context of the menu tree (also see section 12 entitled “Menu tree”).
The function of the keys changes depending upon the active menu item.

Key Name

Function

Effect

Menu

Call or exit the menu for setting the parameters

Scroll up

Navigate Set a parameter Navigate

Selecting a submenu (moving the arrow) Increasing the number at the cursor or changing properties
Selection

Scroll right

Set a parameter

Scroll the cursor to the right (e.g., selection of the number of a parameter to be changed)

Enter

Menu selection Set a parameter

Open the marked submenu Confirm the value of a parameter

Table 4: Functions of the keys

In the following sections on menu description, it is assumed that the password has already been entered and confirmed and the main menu has already been displayed.

Example: Changing the password from 0000 to 2600

current display

Key(s)

Remark

7,2 Pa 21,8 °C 75,6 %rH
PASSWORD 0000

Call the menu to set parameters
The default setting of the password is 0000 and can now be confirmed using “Enter”

VALUES

2 x

Scroll up twice to mark the submenu [ SETTINGS ]

SETTINGS

Open the marked “Settings” submenu using “Enter”

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Instruction Manual PUC 28

LANGUAGE

Scroll once up to mark the next submenu item [ SETTINGS / NEW PASSWD ]

NEW PASSWD

Open the “New password” submenu item using “Enter”

NEW PASSWD 0000

2 x

NEW PASSWD 2000

Increase the number to 2 by scrolling up twice
Move to the next digit by scrolling right

x

NEW PASSWD

2000

6 x

NEW PASSWD 2600

Increase the number to 6 by scrolling up six times
Confirm using “Enter”

NEW PASSWD
7,2 Pa 21,8 °C 75,6 %rH

Exit setting parameters using “Menu” and return to display mode
Caution: The new password is now needed to call the menu!

5.1 Abbreviations used

In showing the menu on the display, the following abbreviations are used:

German D 1 1-T 1-D 2 2-F 2-D OUT-D HYST U I-0 I-4

English P 1 1-T 1-P 2 2-H 2-P OUT-P HYST U I-0 I-4

Description
Pressure
Input “IN1” Input “IN1” used for measuring temperature Input “IN1” used for measuring pressure Input “IN2” Input “IN2” used for measuring humidity Input “IN2” used for measuring pressure Pressure output signal
Hysteresis
Voltage signal 0 … 10 V
Current signal 0 … 20 mA
Current signal 4 … 20 mA

Table 5: Menu abbreviations used in the display

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Instruction Manual PUC 28 5.2 Basic settings [ SETTINGS ] This menu branch contains the basic settings of the PUC 28.

5.2.1 Language [ SETTINGS / LANGUAGE ]

This submenu is used to select the display language.

Parameter description Language

Range of values D – German GB – English

Table 6: Display language choices

Default setting German

5.2.2 Changing the password [ SETTINGS / NEW PASSWD ]

This submenu is used to change the password for enabling the parameter menu.

Parameter description Password

Range of values Consists of 4 digits 0000 … 9999

Table 7: Password parameter

Default setting 0000

5.2.3 Measurement range of the internal pressure sensor [ SETTINGS / MEAS. RANGE ]

This parameter can specify the measurement range of the internal pressure sensor. The parameter is a function of the installed pressure sensor and is already set at the factory.

Parameter description Measurement range

Range of values Default setting

100 Pa 250 Pa

A function of the installed sensor

Table 8: Measurement range parameter

Setting the measurement range affects scaling, the limits and the characteristic curve of the internal pressure sensor. For this reason, the default setting should not normally be changed.

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Instruction Manual PUC 28

5.2.4 External sensors (IN1 and IN2) [ SETTINGS / CONF. EXTERN ]

External sensors may be connected to the inputs IN1 and IN2. The parameter informs the PUC 28 as to which sensor is connected to the corresponding input.

Parameter description External sensors

Range of values
IN1 ­ Temperature; IN2 ­ Humidity IN1 ­ Temperature; IN2 ­ Pressure IN1 ­ Pressure; IN2 ­ Humidity IN1 ­ Pressure; IN2 ­ Pressure

Table 9: Possible settings for the external sensors

Default settings
IN1 ­ Temperature IN2 ­ Humidity

The units of the values shown in the display are adjusted automatically (temperature in °C, humidity in %rH, pressure in Pa). The units of a pressure display can be subsequently changed to hPa or mbar in the following “Display” submenu.

5.2.5 Display [ SETTINGS / DISPLAY ]

In the default setting, the display shows three values:

Pressure Temperature Humidity

There are three submenus for these parameters. The display of each individual value can be blanked in these submenus (blanking of the entire line). This makes sense if no sensor is connected to the corresponding input or the internal pressure sensor is not used. If the value represents a pressure, the units can be selected (Pa, hPa or mbar). The range of values for the corresponding channel depends on the setting in the menu branch “CONF. EXTERN” that was used to specify which sensor is connected to the corresponding input.

Channel * INT. PRESS. IN1-P IN2-P
IN1-T IN2-H

Parameter description Units of pressure for the display of the internal or externally connected sensors Whether the display is blanked or not

Table 10: Display settings

Range of values Pa hPa mbar OFF – no display ON OFF

Default setting Pa
ON

• The channels are displayed according to the selection made under “CONF. EXTERN”.

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Instruction Manual PUC 28

5.2.6 Signal [ SETTINGS / SIGNAL ] This submenu is used to specify the type for the analogue pressure output signal and the analogue input signals IN1 and IN2 to the connected sensor.

Input/output OUT-P IN-1 IN-2

Parameter description Signal type (current signal or voltage signal)

Range of values U 0 … 10 V I-0 0 … 20 mA I-4 4 … 20 mA

Default setting I-4

11: Display settings

Table

5.2.7 Acoustic signalling device [ SETTINGS / SOUND ] The internal acoustic signalling device generates, in the event of alarm, an intermittent signal and a brief signal every time a key press is registered. The alarm signal can be confirmed by pressing any key (even if the parameter “Alarm acknowledgement” in the relay menu is not set). The pulse duration and separation of the intermittent alarm signal are set using the “LENGTH” parameter. The set length also determines the alternating interval between showing the alarm and the measured values on the display (in the case of measured values that have gone outside their limits, see section 3.3 entitled “Display of measured values”). The internal acoustic signalling device can be activated or deactivated.

Submenu ON or OFF
LENGTH

Parameter description Activation or deactivation, respectively, of the acoustic signalling device Pulse duration and pulse separation

Range of values ON – activated OFF – deactivated
0.1 … 5 s

Table 12: Parameter description for the acoustic signalling device

Default setting ON
0.5 s

5.2.8 Decimal places display [ SETTINGS / DECIMAL PL. ]

It can be specified separately for the internally measured pressure and the two inputs IN1 and IN2 whether the measured value should be shown on the display with or without a decimal place.

Parameters INT. PRESS. IN1-T IN1-P IN2-H IN2-P

Range of values ON – Shown with decimal places OFF – Shown without decimal places

Table 13: Decimal places display parameter description

Werkseinstellung ON

If the units of mbar or hPa have been set for a pressure value, this value can only be displayed with a decimal place.
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Instruction Manual PUC 28
5.2.9 Delete Re-Calibration [ SETTINGS / UNDO TEACH ] Any re-calibration (positive as well as negative range) carried out after the delivery will be called off (concerns only the variants PUC 28/K). 5.2.10 Reset the device [ SETTINGS / RESET ] The PUC 28 will be resetted completely (this is equvalent switching off and on again the power supply of the device). The Profibus interface (for devices with Profibus DP interface) is also initialized. The menu settings stay unchanged.
Resetting the device might for example be useful if a new address is being set with the help of the both rotary switches. After the reset the new address is active. 5.2.11 Recall the delivery state [ SETTINGS / DELIVERY ST. ] According the acual configured measurement range (±100 Pa or ±250 Pa) all menu settings are reset to the delivery state and being saved. Subsequently the PUC 28 will be resetted completely (this is equvalent switching off and on again the power supply of the device). The Profibus interface (for devices with Profibus DP interface) will also be initialized. 5.3 Scaling and limits [ VALUES ] The PUC 28 is adjusted for the sensors used and the limits set for the alarm signals in the “VALUES” menu.
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Instruction Manual PUC 28

5.3.1 Scaling [ VALUES / SCALE ] The measurement ranges of the connected sensors are set for the PUC 28 in this menu branch. “VALUE BOT” represents the measured value at 0(4) mA or 0 V. For “VALUE TOP”, the measured value for the analogue signal (20 mA or 10 V) must be entered.
The output signal can be adjusted in the same manner for the pressure measured using the internal sensor.

Please make sure that the VALUE TOP is larger than the VALUE BOT. If both new values are positive, the upper value must be set first. If both new values are negative, the lower value must be set first (always assuming that the old values have been according the delivery state). In case it is tried to enter a value for the upper value which is equal or lower than the actual lower value, the entered value is set to the actual lower value, increased by 0.1 Pa (°C, %rH). In case it is tried to enter a value for the lower value which is equal or higher than the actual upper value, the entered value is set to the actual upper value, decreased by 0.1 Pa (°C, %rH). The calculated value will then be shown in the display for further editing, the value won’t be stored yet.

Input / sensor

Value

OUT-P

VALUE TOP VALUE BOT

IN 1-T IN 1-P IN 2-H IN 2-P

VALUE TOP VALUE BOT VALUE TOP VALUE BOT VALUE TOP VALUE BOT VALUE TOP VALUE BOT

Table 14: Scaling parameter description

Range of values -120 … +120 Pa * -300 … +300 Pa * -120 … +120 Pa -300 … +300 Pa ** -800 … +800 °C -800 … +800 °C -300 … +300 Pa -300 … +300 Pa
0 … 800 %rH 0 … 800 %rH -300 … +300 Pa -300 … +300 Pa

Default setting
+100 Pa * / +250 Pa
-100 Pa * / -250 Pa *
60 °C 5 °C +100 Pa / +250 Pa -100 Pa * / -250 Pa ** 75 %rH 0 %rH +100 Pa

• / +250 Pa * -100 Pa / -250 Pa **

• Value applies to a PUC 28 with an internal ±100 Pa sensor ** Value applies to a PUC 28 with an internal ±250 Pa sensor

5.3.2 Limits [ VALUES / WARNING ] The PUC 28 monitors the measured values and can trigger an alarm if the limit is dropped below or exceeded. The upper and lower limits and hysteresis can be set for each measured value in this menu branch. The hysteresis is identical for both limits and ensures that, in the case of measured values fluctuating around the limit, an alarm is not triggered again and again (see Fig. 13).

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Instruction Manual PUC 28

Fig. 13: Switching points of the relay considering hysteresis

Example: With an upper limit of 100 and a hysteresis of 10, the alarm is triggered at 105 and reset again at 95.
Please make sure that the VALUE TOP is larger than the VALUE BOT. If both new values are positive, the upper value must be set first. If both new values are negative, the lower value must be set first (always assuming that the old values have been according the delivery state). In case it is tried to enter a value for the upper value which is equal or lower than the actual lower value, the entered value is set to the actual lower value, increased by 0.1 Pa (°C, %rH). In case it is tried to enter a value for the lower value which is equal or higher than the actual upper value, the entered value is set to the actual upper value, decreased by 0.1 Pa (°C, %rH). The calculated value will then be shown in the display for further editing, the value won’t be stored yet.

Input / sensor Internal pressure
IN 1-T IN 1-P IN 2-H IN 2-P

Value
VALUE TOP
VALUE BOT
HYST VALUE TOP VALUE BOT HYST VALUE TOP VALUE BOT HYST VALUE TOP VALUE BOT HYST VALUE TOP VALUE BOT HYST

Range of values -120 … +120 Pa * -300 … +300 Pa * -120 … +120 Pa -300 … +300 Pa **
0 … 50 Pa -800 … +800 °C -800 … +800 °C
0 … 100 °C -300 … +300 Pa -300 … +300 Pa
0 … 125 Pa 0 … 800 %rH 0 … 800 %rH 0 … 50 %rH -300 … +300 Pa -300 … +300 Pa 0 … 125 Pa

Default setting
+100 Pa * / +250 Pa
-100 Pa * / -250 Pa *
0 Pa 60 °C 5 °C 0 °C +100 Pa / +250 Pa -100 Pa * / -250 Pa 0 Pa 75 %rH 0 %rH 0 %rH +100 Pa * / +250 Pa * -100 Pa / -250 Pa 0 Pa

Table 15: Limits parameter description

• Value applies to a PUC 28 with an internal ±100 Pa sensor ** Value applies to a PUC 28 with an internal ±250 Pa sensor

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Instruction Manual PUC 28
5.4 Filter setting [ FILTER ] In various applications, brief pressure surges or other undesirable short signal fluctuations may occur. For this case, the PUC 28 has a low-pass filter for smoothing the measured values (see Fig. 14). The filter time, which can be set, is dependent on the expected signal fluctuations and the desired degree of smoothing.

Fig. 14: Effect of the low-pass filter on the measured value display

Input / sensor Internal pressure IN 1 IN 2

Range of values 0.025 … 40 s 0.125 … 40 s 0.125 … 40 s

Default setting 0.5 s
0.125 s 0.125 s

Table 16: Filter settings parameter description

The filter has the function of smoothing any fluctuating measured values. For the activation and deactivation delays of the relays, please use the corresponding possible settings (see section 5.5.2 entitled “Relay activation and deactivation delays”).

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Instruction Manual PUC 28

5.5 Relays [ RELAY ] The PUC 28 has two relays (in some variants of the PUC 28 these relay contacts are not present). Relay 1 is triggered when the upper limits have been exceeded; relay 2 is triggered when values fall below the lower limits. In the quiescent state, contacts 3/4 and 6/7 are closed at the relay connector. If the signal drops below the limit, contacts 5/6 close and if the signal exceeds the limit, contacts 2/3 close.

5.5.1 Switching conditions and relay test [ RELAY / COND. TEST ] In this menu item, you specify which measured values are included in controlling the relays (internal pressure, IN1 and IN2 input signal). This setting always applies to both the upper and the lower limits of the corresponding signal.

Parameters Condition

Range of values

Code
0 1 2 3 4 5 6 7

Internal pressure sensor
x x x x

IN1 IN2

Default setting 7 – All limits are included in the
relay control system

x x x x
x x x x

Table 17: Switching conditions parameter description

While setting the switching conditions, both relays are energized for test purposes (until the final pressing of the Enter key).

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Instruction Manual PUC 28

5.5.2 Relay activation and deactivation delays [ RELAY / TIME REL. ]

A separate activation delay and deactivation delay can be set for each of the two relays. Please keep in mind that the activation delay of the relay is the same as the deactivation delay.

Parameter Time 1 Time 2

Applies to Relay 1 Relay 2

Range of values 0 … 240 s 0 … 240 s

Default setting 5 s 5 s

Table 18: Activation and deactivation delay parameter description

Example: With an activation and deactivation delay of 5 s, there are three possible alarm sequences shown in the following figure.
1. The duration of the alarm state is shorter than the activation and deactivation delay: The acoustic alarm is triggered immediately once the limit is passed (alarm state). As the response delay is shorter than the duration of when the limit is passed, the corresponding relay does not switch. The acoustic alarm is switched off immediately when the alarm state no longer exists.
2. The duration of the alarm state is longer than the activation and deactivation delay and the alarm is not confirmed: The acoustic alarm is triggered immediately once the limit is passed (alarm state). After the response delay of 5 s, the appropriate relay switches. Once the cause of the alarm is no longer present, the acoustic alarm is switched off immediately. The relay switches off after the deactivation delay of 5 s.
3. The duration of the alarm state is longer than the activation and deactivation delay but the alarm is confirmed: The acoustic alarm is triggered immediately once the limit is passed (alarm state). After the response delay of 5 s, the appropriate relay switches. The acknowledgement deactivates the acoustic alarm and the relay immediately.

Fig. 15: The three possible alarm sequences with an activation and deactivation delay of 5 s
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Instruction Manual PUC 28
For using the functions described above, also keep in mind the switching conditions of the relays and the adjustable alarm confirmation described in this section.

5.5.3 Alarm acknowledgement [ RELAY / ACKNOWLEDGE ]

In the alarm state (exceeding the upper limits or dropping below the lower limits), relay 1 or relay 2 is activated. Under consideration of the activation and deactivation delays, the relays remain energized as long as the alarm state persists. If this behaviour is not desired (e.g., because a loud horn is connected to the relay outputs), the alarm acknowledgement can be activated.

If “Acknowledge” is activated, the alarm is confirmed by pressing one of the four keys. This not only switches off the internally generated acoustic alarm but also deactivates both relays. That means that exactly those limit violations will be acknowledged which are active at the time of the acknowledgement. The alarm (acoustic alarm and relay activation) is triggered again if an additionally limit is violated or an existing limit violation is acknowledged and triggered again.

Parameter Acknowledge

Range of values ON OFF

Default setting OFF

Table 19: Relay acknowledgement parameter description

5.6 Re-Calibration [ TEACH ] The PUC 28/K has the feature to re-calibrate the pressure measurement without the need of removing the device out of its environment. For that purpose, on the front side of the device two pressure input ports are located which are marked with “+” and “-“.
In case after a certain time of operation a re-calibration should be instructed, at first one of the two menu items “TEACH” has to be called, depending if the positive or the negative range should be re-calibrated. In each case the maximum pressure is being calibrated, thus +100Pa resp. +250Pa for the positive range or -100Pa resp. -250Pa for the negative range.
After selecting this menu item by pressing “Enter”, a confirmation message with the selections “no” and “yes” appears. At first, “no” is selected. With the keys “Scroll up” or “Scroll right” select “yes” and confirm with “Enter”.
The pressure measurement now switches to the input at the front side. Now the calibration pressure has to be applied from outside. Keep watch that the applied pressure is not too high (±120Pa for the 100Pa device; ±300Pa for the 250Pa device). Otherwise the device might be damaged.
As soon as the pressure applies stable (no more transient oscillations), again press “Enter” (alternatively the re-calibration might be cancelled by pressing “Menu”). In the upper line of the display now the setting value of the calibration pressure appears, in the middle line the message “meas. active”. At the end of the measurement in the upper line the result of the calibration appears (“done” or “error”). Additionally it is prompted to remove the hoses from the calibration input. The calibration measurement counts valid if the calibration value differs at max. ±30% of the factory calibration (this also applies for repeated calibrations, the factory calibration always stays remanent in the device).
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Instruction Manual PUC 28 After removing the hoses from the front side, a valid calibration result might be either taken over (press “Enter”) or discarded (press “Menu”). An invalid result is always being discarded. After pressing “Enter” the pressure measurement switches back to the input at the rear side, in the display the menu “values” appears. By pressing “Menu”, the normal display mode is being reached. After taking over the calibration result, the calculation of the pressure value immediately considers the new determined calibration value.
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Instruction Manual PUC 28
6 RS232 Interface
This section only applies to devices equipped with RS232 interface. The serial RS232C interface allows configuring the PUC 28 (alternatively to the configuration with the help of the integrated keys in the front plate) as well as reading the measured values and triggering certain actions (e.g. zero-point calibration) with the help of a PC.
The serial interface has the following settings: 9600 Baud 8 data bits 1 stop bit no parity
6.1 List of RS232 commands
For the configuration of the PUC 28 and the reading of measured values the following commands are available:
6.1.1 Commands for Configuration
All parameters can be written and read. For each parameter the command for read and write is the same, only the character “>” is placed before the command to write, while a “?” is placed before the command to read.
Both when writing and reading a parameter, the PUC 28 sends back the same parameter name with the actual value as answer:
Example for writing: >WarnPdown -22.5 WarnPdown -22.5
(The bottom warning value for the internal pressure is being set to -22.5Pa.)
Example for reading: ?WarnPdown WarnPdown -22.5
(The bottom warning value for the internal pressure is actually -22.5Pa.)
For sending parameter values the following rules apply: – The spelling of the parameter names is case-sensitive. – A blank has to be between parameter name and value. – Positive values have to begin directly with a numeral, a “+” is not allowed. – In case of decimal places, these have to follow a point (no comma!). Integers can be without a “.0”, but it can be present optionally. – Pressure values are always being sent in Pa, even if the display in the front plate shows the values in another unit. – Sending a value has to be finished by a (ASCII character no. 13).
Under consideration of the same rules also the PUC 28 sends the answer telegrams.
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Instruction Manual PUC 28

A value which has been sent is effective immediately, but it is not saved permanently automatically. For this, the command “SaveSet” has to be used.
In case the PUC 28 doesn’t accept the value which has been sent, the answer contains an error code (see section 6.2).

Now a listing of all commands for configuration:

No. Name

Format Unit Description

1 ScalPdown

float

Pa

Scaling of int. pressure, bottom value (for

analogue output)

2 ScalPup

float

Pa

Scaling of int. pressure, top value (for analogue

output)

3 ScalIN1Tdown float

°C

Scaling of IN1, bottom value (input IN1 as

temperature)

4 ScalIN1Tup float

°C

Scaling of IN1, top value (input IN1 as

temperature)

5 ScalIN1Pdown float

Pa

Scaling of IN1, bottom value (input IN1 as

pressure)

6 ScalIN1Pup float

Pa

Scaling of IN1, top value (input IN1 as pressure)

7 ScalIN2Hdown float

%rH Scaling of IN2, bottom value (input IN2 as

humidity)

8 ScalIN2Hup float

%rH Scaling of IN2, top value (input IN2 as humidity)

9 ScalIN2Pdown float

Pa

Scaling of IN2, bottom value (input IN2 as

pressure)

10 ScalIN2Pup float

Pa

Scaling of IN2, top value (input IN2 as pressure)

11 WarnPdown

float

Pa

Warning of int. pressure, bottom value

12 WarnPup

float

Pa

Warning of int. pressure, top value

13 WarnPHyst

float

Pa

Warning of int. pressure, hysteresis

14 WarnIN1Tdown float

°C

Warning of IN1, bottom value (input IN1 as

temperature)

15 WarnIN1Tup float

°C

Warning of IN1, top value (input IN1 as

temperature)

16 WarnIN1THyst float

°C

Warning of IN1, hysteresis (input IN1 as

temperature)

17 WarnIN1Pdown float

Pa

Warning of IN1, bottom value (input IN1 as

pressure)

18 WarnIN1Pup float

Pa

Warning of IN1, top value (input IN1 as

pressure)

19 WarnIN1PHyst float

Pa

Warning of IN1, hysteresis (input IN1 as

pressure)

20 WarnIN2Hdown float

%rH Warning of IN2, bottom value (input IN2 as

humidity)

21 WarnIN2Hup float

%rH Warning of IN2, top value (input IN2 as

humidity)

22 WarnIN2HHyst float

%rH Warning of IN2, hysteresis (input IN2 as

humidity)

23 WarnIN2Pdown float

Pa

Warning of IN2, bottom value (input IN2 as

pressure)

24 WarnIN2Pup float

Pa

Warning of IN2, top value (input IN2 as

pressure)

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Instruction Manual PUC 28

No. Name

Format

25 WarnIN2PHyst float

26 FilterP 27 FilterIN1 28 FilterIN2 29 Lang

integer integer integer integer

30 Password 31 MeasRange

integer integer

32 ExtPress

integer

33 UnitP 34 UnitIN1 35 UnitIN2 36 SignalP 37 SignalIN1 38 SignalIN2 39 Sound 40 SoundTime 41 DecPlP 42 DecPlIN1T 43 DecPlIN1P 44 DecPlIN2H 45 DecPlIN2P 46 RelAssign

integer integer integer integer integer integer integer integer integer integer integer integer integer integer

Unit Pa msec msec msec
msec

Description
Warning of IN2, hysteresis (input IN2 as pressure) Filter time internal pressure Filter time IN1 Filter time IN2 Language 0 = german; 1 = english Password (4-digit) measurement range 0 = ±250Pa; 1 = ±100Pa Configuration for external pressure 0 = no external pressure sensors 1 = only at IN-2 2 = only at IN-1 3 = at both analogue inputs Display of internal pressure 0 = Pa; 1 = hPa; 2 = mbar; 3 = off Display of IN-1 0 = °C or Pa; 1 = hPa; 2 = mbar; 3 = off Display of IN-2 0 = %rH or Pa; 1 = hPa; 2 = mbar; 3 = off Signal at analogue output 0 = 0 – 20mA; 1 = 4 – 20mA; 2 = 0 – 10V Signal at IN-1 0 = 0 – 20mA; 1 = 4 – 20mA; 2 = 0 – 10V Signal at IN-2 0 = 0 – 20mA; 1 = 4 – 20mA; 2 = 0 – 10V Warning sound 0 = off; 1 = on Length of warning sound decimal places of internal pressure 0 = off; 1 = on decimal places of IN1 as temperature 0 = off; 1 = on decimal places of IN1 as pressure 0 = off; 1 = on decimal places of IN2 as humidity 0 = off; 1 = on decimal places of IN2 as pressure 0 = off; 1 = on Relay-Channel-Assignment 0 = never switched on 1 = when IN2 is exceeded/dropped 2 = when IN1 is exceeded/dropped 3 = when IN1 + IN2 is exceeded/dropped 4 = when int. pressure is exceeded/dropped 5 = when int. pressure + IN2 is exceeded/
dropped 6 = when int. pressure + IN1 is exceeded/
dropped 7 = when int. pressure + IN1 + IN2 is exceeded/
dropped

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Instruction Manual PUC 28

Nr. Name 47 RelTime1 48 RelTime2 49 RelAck
50 DeviceAdr

Format Unit Description

integer sec Response time for relay 1 (for exceedings)

integer sec Response time for relay 2 (for lower deviations)

integer

Relay acknowledgement

0 = off; 1 = on

integer

Device address (only read access; is configured

with BCD switches at the device)

6.1.2 Commands for reading the measured values and the status values

With the help of these commands the actual measured values as well as other status values can be read out. For the transfer of the messages, the same rules apply as for the commands for configuration.

Nr. Name 1 ?IP 2 ?IN1 3 ?IN2 4 ?ST
5 ?WARN

Format float float float byte
byte

Einheit Pa/hPa/mbar °C/Pa/hPa/mbar %rH/Pa/hPa/mbar

Bedeutung
internal pressure 1) Signal at IN-1 1) Signal at IN-2 1)
Status Bit 0 = 0 Zero-point calibration is currently
not in progress Bit 0 = 1 Zero-point calibration is currently
in progress 2)
Warning Status Bit 0: signal dropped below lower warning
value of IN-2 or signal is below bottom measurement limit Bit 1: signal dropped below lower warning value of IN-1 or signal is below bottom measurement limit Bit 2: internal pressure dropped below lower warning value 3) Bit 3: internal pressure is below bottom measurement limit Bit 4: signal exceeded upper warning value of IN-2 or signal is above upper measurement limit Bit 5: signal exceeded upper warning value of IN-1 or signal is above upper measurement limit Bit 6: internal pressure exceeded upper warning value 4) Bit 7: internal pressure is above upper measurement limit

1. The transfer is carried out with the actually configured unit with the full internal accuracy. If
   the measured value is outside the measurement range, the answer contains an error code
   (see section 6.2). 2) During a zero-point calibration the received measured values are not valid. 3) Consider bit 3 additionally. 4) Consider bit 7 additionally.

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Instruction Manual PUC 28

6.1.3 Other commands

Some actions can be activated directly with the help of certain commands. Here’s a listing of these commands:

Nr. Name 1 RecallWE
2 SaveSet 3 MZ 4 >CMD

Format Antwort PUC 28 Vx.x
OK OK byte CMD

5 ?CMD 6 Reset 7 >TCalibPlus
8 >TCalibMinus
9 >TCalibOK
10 >TCalibFinished 11 RecallCalib

CMD PUC 28 Vx.x OK
OK
TCalibOK OK OK

Bedeutung
Configuration according delivery state (the old measurement range keeps preserved) and reset PUC 28 1)
Saving the actual configuration in EEPROM
start zero-point calibration cycle (ZPCC) now
Control word Bit 0 = 0 ZPCC automatically:
Zero-point calibration is being started automatically by the PUC 28 every 15 min in the first hour following power-up and afterwards every hour Bit 0 = 1 ZPCC is being started by an RS232 command ( no automatic calibration) Bit 1 = 0 Don’t start ZPCC now Bit 1 = 1 Start ZPCC now (The rising edge specifies the starting time, the bit has to be reset again during or after the ZPCC.)
Reading of the control word Reset the PUC 28 1) re-calibrate the positive range 2) (switching to the input at the front side) re-calibrate the negative range 2) (switching to the input at the front side) start measurement for re- calibration 2) (-100Pa or 100Pa resp. -250Pa or 250Pa must apply stable)
terminates re-calibration (switching to the input at the back side) delete re- calibration 3)

1. After power-up as well as after a reset the PUC 28 comes up with the message “PUC 28 Vx.x” (or “PUC 28/K Vx.x” for the PUC 28/K), where x.x represents the actual software release. The time until this message appears might be up to 5 sec.

2. The commands for re-calibration are only available at the device variants “PUC 28/K”.

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Instruction Manual PUC 28 The re-calibration is being started with the command “TCalibPlus” (in case the positive range shall be re-calibrated) or “TCalibMinus” (in case the negative range shall be recalibrated). When receiving a re-calibration command, first the PUC 28/K switches to the input at the front side and shows the value of the pressure to be calibrated in the display, combined with a request to apply this pressure. In case the positive range shall be re-calibrated (command >TCalibPlus), a reference pressure of +100Pa resp. +250Pa has to be applied from outside; in case the negative range shall be re-calibrated (command >TCalibMinus), a reference pressure of -100Pa resp. -250Pa has to be applied from outside. As soon as the pressure applies stable (no more transient oscillations), the command “>TCalibOK” has to be sent. This actually triggers the pressure measurement. During this time the message “meas. active” appears in the display. The duration of the pressure measurement is about 5 sec. The reference pressure has to be applied stable until the RS232 response is being received, which incorporates the command (TCalibOK) and the new determined calibration value (resp. an error message). Additionally it is prompted to remove the hoses from the calibration input. When the hoses are removed from the calibration input, the command “>TCalibFinished” has to be sent. The PUC 28/K then switches back the pressure measurement to the back side and returns to the display mode. 3) Any re- calibration (positive as well as negative range) carried out after the delivery will be called off (concerns only the variants PUC 28/K).
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Instruction Manual PUC 28

6.2 Error codes

After sending a command the following error messages are possible:

No.

Error message

Description

1

Err_CmdNotExist An unknown command has been sent to the

PUC 28.

2

Err_ValRange

The transfered parameter value is outside it’s

valid limits. This might happen also (among

other things), if a top value is smaller or equal

the associated bottom value.

The error will also be generated after a re-

calibration of a PUC 28/K, if the calibration

value differs more than ±30% of the factory

calibration.

3

Err_NotActive

– It was tried to read a measured value of a

channel which is currently switched off.

– It was tried to cancel a re-calibration,

although no re-calibration is running

(concerns only the variants PUC 28/K).

4

Err_Underflow

The measured value is below the bottom

measurement limit.

5

Err_Overflow

The measured value is above the upper

measurement limit.

6

Err_ZPCC_active Currently a re-calibration is not possible

because of a running zero-point calibration.

Possibly suppress any zero-point calibration before re-calibration with the command “>CMD 1” (concerns only the variants PUC 28/K).

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Instruction Manual PUC 28

6.3 Assignment of the RS232 connector

The assignment of the RS 232 connection corresponds to the assignment specified by the EIA (Electronic Industries Alliance):

9-pole D-SUB-jack (female) (top view from outside):

5-pole M12-jack (female, A-encoded) (top view from outside):

The RS232 interface of the PUC 28 is available in the following variants:

1. PUC 28 variants with 9-pole D-SUB-jack (female) directly integrated in the housing (only for wall thicknesses up to 5mm):

Pin No. 2 3 5

Signal TxD RxD GND

Description Sending line Receiving line Ground

2. PUC 28 variants with 9-pole D-SUB-jack (female) at a flying leads cable:

Pin No. 2 3 5

Signal TxD RxD GND

Description Sending line Receiving line Ground

3. PUC 28 variants with 5-pole M12-jack (female, A-encoded) at a flying leads cable:

Stift Nr. 2 3 4

Signal TxD GND RxD

Bedeutung Sending line Ground Receiving line

Table 20: Pin assignment of the RS232 connector

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Instruction Manual PUC 28 6.4 Interface configuration Under Windows XP set up the serial interface configuration (COM port) as follows. The process is similar for older Windows systems. To find the interface configuration: Go to START SETTINGS CONTROL PANEL. There click on SYSTEM and select the HARDWARE tab. Subsequent click on DEVICE MANAGER, there select PORTS. Now double-click on the COM port which is used, therafter select the PORT SETTINGS tab.
6.5 Configuration software For a comfortable configuration and maintaince/logging of the measured values the PC software “PUC 24 / PUC 28 Start-Up Tool” exists. The software is available for downloading from the Internet site www.halstrup-walcher.de under the path “Downloads / Software”.
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Instruction Manual PUC 28 When a measurement is currently running, the program presents itself in the following way:
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Instruction Manual PUC 28
Short description of the program features:
Tab “Scaling Values”: The scaling values for the analogue output of the internal pressure as well as for the both analogue inputs can be configured here.
Tab “Warning Values”: The warning values for the internal pressure as well as for the both analogue inputs can be configured here.
The scaling and warning values of a pressure might be entered in different units (hPa, kPa, mbar, mmH2O, mmHg, Psi, inH2O, inHg). For this purpuse, double-click on the corresponding input field. The following window appears:
In this window enter the desired value in the desired unit and click “Paste”. The value will be internally calculated in Pa and entered as scaling or warning value.
Should the configuration be in Pa, click only one time into the corresp. input field (instead of double-click) and enter directly the value.
Tab “Other settings”: All other settings can be configured here.
Tab “Measuring Values”: Here all measured values are displayed graphically and in a list, besides there’s a possibility to save the values in a CSV- compatible file. Additionally a zero-point calibration, a reset as well as a re-calibration (separately for the positive and the negative measurement range) can be activated directly. (The re-calibration is only available at the device variants “PUC 28/K”.)
Tab “Settings”: The actual configuration parameters can be saved in a file (*.puc) respectively being loaded from there. This is (among other things) helpful for the archival storage of configuration sets as well as for copying a configuration between 2 devices. The “.puc” files use the Windows INI format, therefore the “.puc” files can be easily edited with external programs or with any common text editor.
Menu item “Extras ComPort”: Here the COM port which is used can be set. The other port settings must not be changed (9600 Baud, 8 data bits, 1 stop bit, no parity).
Menu item “Language”: Here the language can be set which is used within the configuration software. This setting is independent of the language which is used inside the PUC 28 itself.
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Instruction Manual PUC 28
The settings for “ComPort” and “Language” are being saved in the file “PUC ToolConfig.ini” after each change. When starting the software the next time, the settings of this file will be used. Button “Load from PUC 28”: All configuration parameters are being load and the fields in the tabs “Scaling Values”, “Warning Values” and “Other Settings” are being filled. Button “Send to PUC 28”: All configuration parameters of the tabs “Scaling Values”, “Warning Values” and “Other Settings” are being sent to the PUC 28 and there being saved in the EEPROM. Button “Delivery State 100Pa and load”: The measurement range ±100Pa is being set, the PUC 28 configures itself according the delivery state for this measurement range and resets itself. Afterwards these configuration parameters are being load. Button “Delivery State 250Pa and load”: The measurement range ±250Pa is being set, the PUC 28 configures itself according the delivery state for this measurement range and resets itself. Afterwards these configuration parameters are being load. Button “Abort transmission”: A loading or sending activity is being aborted ahead of time. Button “Close”: The program is being closed.
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Instruction Manual PUC 28

7 Profibus DP interface
This section only applies to devices equipped with Profibus DP interface. For configuring the PUC 28 as a slave in a Profibus system, the GSD files “HaWa09BF.GSD” (for PUC 28 with internal ±100 Pa sensor) and “HaWa0BCD.GSD” (for PUC 28 with internal ±250 Pa sensor) are supplied. As an alternative, the GSD files files are available for downloading from the Internet site www .halstrup-walcher.de under the path “Downloads / Software”.

7.1 Profibus DP address
The slave address is configured using the two rotary “DP ADDRESS” switches on the back of the PUC 28. Each switch has 10 positions. The tens position of the address is set using the left switch, the units position using the right switch. Consequently, addresses between 00 and 99 can be used. After assigning a new address, the supply voltage of the PUC must be briefly interrupted (Reset), or choose “Reset” in the Menu [ SETTINGS ]. The currently valid address can be checked in the menu [ BUS ].

7.2 Terminating resistors

The device has bus terminating resistors that can be connected using the two DIP switches on the back of the PUC 28.

Both switches set to “ON” Both switches set to “OFF”

– resistors connected – resistors disconnected

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Instruction Manual PUC 28

7.3 Modules

There are nine modules available for configuring the PUC 28 as a Profibus slave (combining the input and output data). Any combination of modules is permitted. The only thing to keep in mind is that module 33 (“command byte”) must be a component of the configuration.

No. Conf. Description
1 0xD0 1 word input; consistent over the entire length; signed int “Measured value, internal pressure” (in 1/10 Pa)
2 0xD0 1 word input; consistent over the entire length; signed int “Measured value, temp/pressure IN-1” (in 1/10°C or 1/10 Pa)
3 0xD0 1 word input; consistent over the entire length; signed int “Measured value, humidity/pressure IN-2” (in 1/10%rH or 1/10 Pa)
4 0x10 1 byte input; consistent over byte/word “Warning States”

Bit

Description

0 1 2 3

Value lower than the low
limit

IN 2 IN 1
Internal pressure (if at least one bit =1)

4

IN 2

5

Upper limit

IN 1

6 7

exceeded

Internal pressure (if at least one bit =1)

Bit = 1 outside the limits Bit = 0 within the limits

If a measured value is outside the limits, it may also be outside the valid measurement range. The transferred value could therefore be invalid.

5 0x10 1 byte input; consistent over byte/word

“Status”

Bit

Description

0

Zero-point calibration cycle (ZPCC)

1

2

3

4

No Meaning

5

6

7

Byte.0 = 0 ZPCC is not being performed at this time Byte.0 = 1 ZPCC is being performed at this time
( the measured value supplied are invalid)

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Instruction Manual PUC 28

33 0x10 1 byte output; consistent over byte/word “Control word”

Bit

Description

0

ZPCC by the DP master

1

Start ZPCC now

2

3

4 5

No meaning

6 7

Byte.0 = 0 ZPCC automatically: Zero-point calibration is being started automatically by the PUC 28 every 15 min in the first hour following power-up and afterwards every hour
Byte.0 = 1 ZPCC is started by the Profibus master (no automatic calibration)
Byte.1 = 0 Don’t start ZPCC now Byte.1 = 1 Start ZPCC now (The rising edge specifies the
starting time, the bit has to be reset again during or after the ZPCC.)
34 0xE0 1 word output; consistent over the entire length; signed int “Set pressure, line 1” (in 1/10 Pa)
35 0xE0 1 word output; consistent over the entire length; signed int “Set temperature/pressure, line 2” (in 1/10°C or 1/10 Pa)
36 0xE0 1 word output; consistent over the entire length; signed int “Set humidity /pressure, line 3” (in 1/10%rH or 1/10 Pa)

Table 21: Configurable slave modules of the PUC 28

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Instruction Manual PUC 28

7.4 Setting the parameters of the PUC 28 as a Profibus slave

The following parameters of the PUC 28 Profibus slave are sent automatically to the PUC after the Profibus connection has been established by the master. No menu settings are necessary for this. After the Profibus connection has ended, the device returns automatically to the state of a pure measurement device. However, the Profibus parameters are stored in the device.

Parameter Sound (ein/aus) Relay assignment Time for relay x (sec.) Measurement range Relay acknowledgement Voltage or current External pressure
Display Language Decimal places Sound length (in 50 msec)
Scaling (upper) …
Scaling (lower) …
Warning (upper) …
Warning (lower) …
Hyst. …
Filter duration (x) (msec)

Description
Activate or deactivate the acoustic signalling device see section 5.5.1 entitled “Switching conditions and
relay test [ RELAY / COND. TEST ]” Response time for the relay in seconds
100Pa or 250Pa; see section 5.2.3 entitled “Measurement range of the internal pressure
sensor [ SETTINGS / MEAS. RANGE ]” Switch relay acknowledgement on or off
Select between voltage (0-10 V) or current (0-20 mA, 4-20 mA) for the analogue channels
External pressure at the IN ports
Specify the pressure units and whether to blank the individual lines or not
Select the language (D or GB)
Activate or deactivate
Set the pulse duration and separation of the acoustic signalling device (n x 50 msec) (Ex. “40” 2 seconds) Set the upper scale value (each with a factor of 10) Example for IN2 (humidity) ([1/10]%rH): “1000” 100.0 %rH Set the lower scale value (each with a factor of 10) Example for IN2 (humidity) ([1/10]%rH): “10” 1.0 %rH Set the upper limit (each with a factor of 10) Example for internal pressure ([1/10]Pa): “1000” 100.0 Pa Set the lower limit (each with a factor of 10) Example for internal pressure ([1/10]Pa): “-1000” -100.0 Pa Set hysteresis (each with a factor of 10) Example for IN1 (temperature) ([1/10]°C): “100” 10.0 °C
Filter time in msec, see section 5.4 entitled “Filter setting”

Table 22: Parameters of the slave PUC 28

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Instruction Manual PUC 28

7.5 Assignment of the Profibus connector

The assignment of the Profibus DP connection corresponds to the assignment specified by the PNO (Profibus User Organization):

9-pole D-SUB-jack (female) (top view from outside):

5-pole M12-jack (female, B-encoded) (top view from outside):

The Profibus DP interface of the PUC 28 is available in the following variants:

1. PUC 28 variants with 9-pole D-SUB-jack (female) directly integrated in the housing (only for wall thicknesses up to 5mm):

Pin No. 3 4 5 6 8 Housing

Signal RxD/TxD-P CNTR-P DGND VP RxD/TxD-N Shield

Description Receive/transmit data, positive, B line Repeater control signal (flow control); RTS signal DGND (reference potential to VP) Positive supply voltage (P5V) Receive/transmit data, negative, A line Shield or protective ground

2. PUC 28 variants with 9-pole D-SUB-jack (female) at a flying leads cable:

Pin No. 3 8 Housing

Signal RxD/TxD-P RxD/TxD-N Shield

Description Receive/transmit data, positive, B line Receive/transmit data, negative, A line Shield or protective ground

3. PUC 28 variants with 5-pole M12-jack (female, B-encoded) at a flying leads cable:

Pin No. 2 4 Thread

Signal RxD/TxD-N RxD/TxD-P Shield

Description Receive/transmit data, negative, A line Receive/transmit data, positive, B line Shield or protective ground

Table 23: Pin assignment of the Profibus connector

In the PUC 28 variants with a flying leads cable an original Profibus DP cable is used. Therefore it arises that for these variants the connection of an external terminating resistor is NOT possible (that is: for bus termination the internal terminating resistor has to be used).

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Instruction Manual PUC 28
8 Adjusting the PUC 28 [ TEACH ] Depending on the conditions for using the PUC 28, it may be necessary to adjust the internal pressure transmitter and the analogue inputs and outputs (IN1, IN2 and OUT-P).
When adjusting the pressure sensor and the inputs and outputs, the characteristic curves are affected and the default settings changed. These functions are to be performed with special care. For this reason, this submenu is secured with an additional code.
8.1 Adjusting the internal pressure transmitter After selecting the “TEACH” submenu, the request to enter the code appears (“CODE TEACH”). Please proceed as follows:
1. Press the “Scroll right” key – an “X” appears 2. Confirm using “Enter” and “Scroll up” until “Internal pressure” is activated 3. Press “Enter” – the target pressure to be applied to the pressure ports of the PUC 28
appears in the display 4. After applying the target value, confirm using Enter – after a few seconds, the next
target value appears 5. Continue to repeat this process until no more target values appear 6. Exit the menu using the “Menu” key and briefly interrupt the voltage (hardware reset) or
choose “Reset” in the Menu [ SETTINGS ] If, during this process, an “X” or a “0” appears, a selection can be made using the “Scroll up” key:
X – continue the process (adjust more values) 0 – end adjustment Confirm your selection using the “Enter” key.
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Instruction Manual PUC 28

8.2 Adjusting the analogue inputs and outputs

After selecting the “TEACH” submenu, the request to enter the code appears (“CODE TEACH”). Please proceed as follows:

1. Press the “Scroll right” key – an “X” appears 2. Confirm using “Enter” and “Scroll up” until “SIGNAL” is activated 3. Using the “Scroll right” key, select between the current (“I”) and voltage input (“V”) and
confirm using “Enter” 4. Use “Scroll up” to select the input or output (“OUT-P”, “IN1” or “IN2”) and confirm using
“Enter”

If “IN1” or “IN2” has been selected:

If “OUT-P” has been selected:

5. Apply the target value (current or voltage) shown on the display to the input
6. Confirm using the “Enter” key and continue with 5

5. Using the “Scroll up” and “Scroll right” keys, continue to change the value in the center line until the current or voltage target value specified in the top line appears at the output terminals. The 4-digit value in the center of the display must be selected to be as large as possible while maintaining the target value. That is, it has to be found the highest possible 4-digit value for that the desired current or voltage target value appears at the output terminals (when teaching 0 V and 0 mA, there’s an interval between 0 and a value, from which the output signal begins to rise up).
6. Confirm using the “Enter” key and continue with 5

7. Continue to repeat this process until no more target values appear
8. Exit the menu using the “Menu” key and briefly interrupt the voltage (hardware reset) or choose “Reset” in the Menu [ SETTINGS ]

9 Care instructions for PUC 28
To clean the PUC 28 surface please only use mild dishwashing detergent.
Don’t use any abrasive or acidly detergent, because the surface can be damaged. Don’t use any detergent containing isopropanol, because the Display- Window will be cloudy.

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Instruction Manual PUC 28

10 Technical data

Measurement data measurement range accuracy resolution amplitude drift per temperature overload capability Ambient conditions medium operating temperature storage temperature conformity
Electrical data power consumption supply voltage electrical connections
output signal
input signals (2x)
Relays 2 x changeover contacts (optionally not present)
Table 24: Technical data

-100 to +100 Pa or -250 to +250 Pa 0.5 % of the measurement range + 0.3 Pa 0.1 Pa 0.03 %/K (+10 °C…+50 °C) 200-times

air, all non-aggressive gases +10 °C to +50 °C -10 °C to +70 °C
Declaration of conformity available upon request

7 VA
24 VDC (± 10 %)
PTR: STLZ1550/14-3.81H
PTR: STLZ950/7-5.08H
Binder: 79-4450-20-05
0 … +10 V (RL 2 k) or 0 … 20 mA (RL 500 ) or 4 … 20 mA (RL 500 ) 0 … +10 V (Ri = 470 k) or 0 … 20 mA (Ri = 51 ) or 4 … 20 mA (Ri = 51 )

(signal) (relay) (Profibus DP)

6 A / 230 VAC each

Operating the PUC 28 at room temperature (20°C) ensures the highest possible level of accuracy for pressure measurements.

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Instruction Manual PUC 28

11 Troubleshooting

Problem Display shows nothing

Cause No power

Pressure drops continuously Leak

No Profibus communication No cable connection

Acoustic signal number display flashing
device is not switching despite threshold being exceeded incorrect values for temperature and humidity are being displayed

Alarm triggered a threshold has been exceeded set hysteresis is preventing switching
false connections; wrong signal type set; wrong scaling set

programming through RS232 no correct connection not working

device not responding to button presses and display only shows “CALIBRATION” after pressing the Menubutton, only “PASSWORD” is displayed
When calibrating, “ERROR” is displayed

device is performing automatic auto-zero procedure the device’s settings are protected by a password
Incorrect calibration pressure

Table 25: Troubleshooting

Corrective action Check the terminal connections and supply voltage Firmly slide tubing completely onto ports; adjust diameter Firmly seat connector; check terminating resistor Confirm using any key –
set smaller hysteresis; reduce threshold value by half the set hysteresis check [SETTINGS/SIGNAL]; swap cables for temperature and humidity; adjust scaling [VALUES/SCALE] check connection both on PUC24 and PC; check COMport settings on PC wait for process to finish (takes few seconds)
enter correct password value (factory setting is “0000”) and confirm Check polarity (+/-) of pressure connection; Ensure that correct pressure (100 Pa or 250 Pa) is being applied

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Instruction Manual PUC 28
12 Dimension drawing
47

13 Menu tree

Instruction Manual PUC 28

VALUES FILTER

WARNING ( 5.3.2 Limits)
[CHANNEL:] INT. PRESS. / IN 1T / IN 1-P / IN 2-H / IN 2-P

WARNING
[CHANNEL] [LIMIT:] VALUE TOP / VALUE BOT / HYST

VALUES ( 5.3 Scaling and limits) WARNING
SCALE

SCALE ( 5.3.1 Scaling)
[CHANNEL:] OUT-P / IN 1-T / IN 1-P / IN 2-H / IN 2-P

SCALE
[CHANNEL] [LIMIT:] VALUE TOP / VALUE BOT

FILTER ( 5.4 Filter setting)
[CHANNEL:] INT. PRESS. / IN-1 / IN-2

FILTER [CHANNEL] [VALUE] [CHOICE]

W [CHANNEL][LIMIT] [VALUE] [CHOICE] S [CHANNEL][LIMIT] [VALUE] [CHOICE]

SETTINGS RELAY BUS

see separate menu tree
RELAY ( 5.5 Relays) COND. TEST / TIME 1 / TIME 2 ACKNOWLEDGE

RELAY ( 5.5.1 Switching conditions and relay test)
COND. TEST
[VALUE]

TIME REL. 1 / 2 ( 5.5.2 Relay activation and deactivation delays)
[VALUE] [CHOICE]

ACKNOWLEDGE ( 5.5.3 Alarm acknowledgement)
ON OFF
[CHOICE]

ADDRESS ( 7.1 Profibus DP address)

Enter key Enter key

[VALUE]

Arrow key UP or Arrow key RIGHT

TEACH
(+100Pa/+250Pa) ( 5.6 Re-Calibration)

TEACH
(-100Pa/-250Pa) ( 5.6 Re-Calibration)

TEACH

see separate menu tree

Fig. 16: Main menu

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Instruction Manual PUC 28

LANGUAGE

DELIVERY STATE (100Pa/250Pa) ( 5.2.11)
LANGUAGE ( 5.2.1 Language) D
GB

RESET ( 5.2.10)

UNDO TEACH ( 5.2.9)

DECIMAL PL. ( 5.2.8 Decimal Places)
[CHANNEL:] INT. PRESS. / IN 1-T / IN 1-P / IN 2-H / IN 2-P

DECIMAL PL.

NEW PASSWD

NEW PASSWD ( 5.2.2 Changing the Password) [VALUE] [CHOICE]

DECIMAL PL. [CHANNEL] ON OFF [CHOICE]

MEAS. RANGE

MEAS. RANGE ( 5.2.3 Measurement range of the internal pressure sensor) 100Pa 250Pa
[CHOICE]

Enter key Enter key

CONF. EXTERN

CONF. EXTERN ( 5.2.4 External sensors)
IN-1 = TEMP; IN-2 = HUMID IN-1 = TEMP; IN-2 = PRESS IN-1 = PRESS; IN-2 = HUMID IN-1 = PRESS; IN-2 = PRESS

Arrow key UP or Arrow key RIGHT

DISPLAY SIGNAL SOUND

DISPLAY ( 5.2.5 Display)
[CHANNEL:] INT. PRESS. / IN1-T / IN1P / IN2-H / IN2-P *)

[CHANNEL] Pa hPa mbar OFF [resp.] ON OFF
[CHOICE]

SIGNAL ( 5.2.6 Signal) [CHANNEL:] OUT-P / IN-1 / IN-2
SOUND ( 5.2.7 Acoustic signalling device) ON OR OFF
LENGTH

SOUND ON OFF [CHOICE]

SIGNAL [CHANNEL] I-0 I-4 U [CHOICE] LENGTH [VALUE] [CHOICE]

Fig. 17: “Settings” menu
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Instruction Manual PUC 28

TEACH

CODE – TEACH ( 8 Adjusting the PUC 24)
Enter code

TEACH INT. PRESS. SIGNAL

[Target value:] 0,0 Pa

SIGNAL T(each)

I

U

[CHOICE]

SIGNAL T(each) OUT-P / IN 1 / IN 2 [CHOICE]

OUT-P …

[Target value] [4-digit-value] [CHOICE] [Target value]

IN1 / IN 2 …

[Target value:] – x Pa [Target value:] x Pa [Selection:]

X (further values)

…

O (cancel)

Fig. 18: “TEACH” menu

Enter key Enter key Arrow key UP or Arrow key RIGHT
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Instruction Manual PUC 28

14 Ranges of values and default settings

The following table shows the minimum and maximum values of each range of values and the default settings:

Name
OUT-P, lower OUT-P, upper IN 1-T, lower IN 1-T, upper IN 1-P, lower IN 1-P, upper IN 2-H, lower IN 2-H, upper IN 2-P, lower IN 2-P, upper
Internal pressure, lower Internal pressure, upper Internal pressure, Hyst.
IN 1-T, lower IN 1-T, upper IN 1-T, Hyst. IN 1-P, lower IN 1-P, upper IN 1-P, Hyst. IN 2-H, lower IN 2-H, upper IN 2-H, Hyst. IN 2-P, lower IN 2-P, upper IN 2-P, Hyst.
Internal pressure IN-1 IN-2
Language
Password

Minimum

Maximum

VALUES SCALING

-120 / -300 ) -120 / -300 )
-800 -800 -300 -300
0 0 -300 -300

+120 / +300 ) +120 / +300 )
+800 +800 +300 +300 800 800 +300 +300

VALUES WARNING

-120 / -300 ) -120 / -300 )
0 -800 -800
0 -300 -300
0 0 0 0 -300 -300 0

+120 / +300 ) +120 / +300 )
50 / 125 *) +800 +800 100 +300 +300 125 800 800 50 +300 +300 125

FILTER

0.025

40

0.125

40

0.125

40

LANGUAGE

D / GB

NEW PASSWORD

0000

9999

Default setting
-100 / -250 ) 100 / 250 )
5 60 -100 / -250 ) 100 / 250 ) 0 75 -100 / -250 ) 100 / 250 )
-100 / -250 ) 100 / 250 )
0 5 60 0 -100 / -250 ) 100 / 250 ) 0 0 75 0 -100 / -250 ) 100 / 250 ) 0
0.5 0.125 0.125
D
0000

Units
Pa Pa °C °C Pa Pa %rH %rH Pa Pa
Pa Pa Pa °C °C °C Pa Pa Pa %rH %rH %rH Pa Pa Pa
sec sec sec

Table 26: Range of values, Part 1

• The first value applies for the ±100 Pa version, the second value for the ±250 Pa version.

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Instruction Manual PUC 28

Name
Measurement range
External pressure sensors
Internal pressure IN-1 IN-2
OUT-P IN-1 IN-2
On or off Length
Internal pressure IN 1-T IN 1-P IN 2-H IN 2-P
Relay/channel assignment
Response time Acknowledge
Address

Minimum

Maximum

Default setting

MEASUREMENT RANGE

±100 / ±250*

±100 / ±250*

EXTERNAL PRESSURE SENSORS

None / on IN-1 / on IN-2 / on IN1 and on IN-2

None

DISPLAY

Pa / hPa / mbar / off

Pa

Pa / hPa / mbar / °C / off

°C

Pa / hPa / mbar / %rH / off

%rH

VOLTAGE AND CURRENT SETTINGS

0-10 V / 0-20 mA / 4-20 mA 0-10 V / 0-20 mA / 4-20 mA 0-10 V / 0-20 mA / 4-20 mA

4-20 mA 4-20 mA 4-20 mA

SOUND

On / off

Off

0.1

5.0

2.0

DECIMAL PLACES

On / off

On

On / off

On

On / off

On

On / off

On

On / off

On

RELAYS

0

7

7

0

240

5

On / off

Off

Profibus DP address

0

99

11

Units Pa
sec sec

Table 27: Range of values, Part 2

• The first value applies for the ±100 Pa version, the second value for the ±250 Pa version.

52

References

• Walcher - Experte für Transformatoren & Automatisierungstechnik
• Drive technology and measurement technology | halstrup walcher
• Antriebstechnik und Messtechnik | halstrup walcher

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