PPI Zenex Pro Advanced Universal Self Tune PID Temperature Controller User Manual
- June 11, 2024
- PPI
Table of Contents
Zenex Pro Advanced Universal Self Tune PID Temperature Controller
Zenex Pro Zenex Pro
User Manual
Advanced Universal Self-Tune PID Temperature Controller with Programmable Timer
User Manual
Zenex Pro
CONTENTS
1. FRONT PANEL LAYOUT 2. BASIC OPERATION 3. SET UP MODE : ACCESS & OPERATION
4. PAGE-10 : I / O CONFIGURATION PARAMETERS 5. PAGE-12 : OP2 FUNCTION
PARAMETERS 6. PAGE-13: OP3 FUNCTION PARAMETERS 7. PAGE-14 : PID CONTROL
PARAMETERS 8. PAGE-15 : SOAK TIMER PARAMETERS 9. PAGE-11 : SUPERVISORY
PARAMETERS 10. MECHANICAL INSTALLATION 11. ELECTRICAL CONNECTIONS
User Manual
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Section 1 FRONT PANEL LAYOUT
User Manual
The controller front panel comprises of digital readouts, LED indicators and tactile keys as shown in Figure 1.1 below.
Figure 1.1
Output-1 Status Indicator
OP1
Output-2 Status Indicator
OP2
Output-3 Status Indicator
OP3
Serial Comm. Indicator Lower Readout COM
PAGE Key
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SOK TMR WLO
Upper Readout Soak Timer Status Indicator Lower Readout – Soak Time Water Low Indicator
L1
ENTER Key
DOWN Key
UP Key
READOUTS
The Upper Readout is a 4 digit, 7-segment bright green LED display and usually
displays the Measured Temperature Value. In Program Mode, the Upper Readout
displays parameter values/options.
The Lower Readout is a 4 digit, 7-segment bright green LED display and usually
displays SP (Control Setpoint) Value. In Program Mode, the Lower Readout
displays parameter names (prompts).
INDICATORS
There are 8 front panel red LED indicators. These indicator show various
statuses. The Table 1.1 below lists each LED indicator (identified by the
front panel legend) and the associated status it indicates.
Table 1.1
Indicator
OP1
Status
· Indicates Output-1 ON/OFF status if the Control Output is Relay or SSR
drive. · Remains OFF if the Control Output is DC Linear.
OP2
· Indicates Output-2 status if OP2 function is Auxiliary / Blower Control. · Flashes Alarm-1 status if OP2 function is Alarm.
OP3
· Indicates Output-3 status if OP3 function is Auxiliary Control. · Flashes Alarm-2 status if OP3 function is Alarm.
COM
Serial Communication Status. Flashes when data is being exchanged with Master Device.
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Indicator
Status
SOK
Flashes while the Soak Timer is counting down.
Glows steadily while the Soak Timer is outside the Timer Start Band or Hold
Band.
TMR WLO
L1
Glows while the Lower Readout shows the Balance Soak Time. Water Level Status. Flashes if water level is LOW. Unused.
KEYS The Table 1.2 lists the four front panel keys and the associated function.
Symbol
Key PAGE DOWN
UP ENTER
Table 1.2
Function
Press to enter or exit set-up mode.
Press to decrease the parameter value. Pressing once decreases the value by
one count; keeping pressed speeds up the change.
Press to increase the parameter value. Pressing once increases the value by
one count; keeping pressed speeds up the change.
Press to store the set parameter value and to scroll to the next parameter on
the PAGE.
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Section 2 BASIC OPERATIONS
POWER-UP Upon power-up the controller executes the following sequence of
operations.
· Checks for Sensor Fault. If the connected sensor type is RTD Pt100 and the
selected sensor type is any of thermocouples or vice-a-versa; the controller
displays sensor fault massage (S.FLt) on upper readout. The user is advised to
take necessary corrective action and press Enter key to acknowledge the fault.
· All displays and indicators are lit on for approximately 3 seconds to check
any display segment failure.
· Displays controller model name on the Upper Readout and the firmware version
on the Lower Readout, for approximately 1 second. This helps user to verify
features and refer to the correct documents versions.
MAIN DISPLAY MODE
After the Power-up display sequence, the Upper Readout starts showing the
Measured Temperature Value and the Lower Readout displays the SP (Control
Setpoint). This is the MAIN Display Mode that shall be used most often.
If the controller is configured to operate in PID Control Mode; the Lower
Readout can be toggled to indicate either SP or % Output Power using the ENTER
Key. The default Lower Readout upon Power-up is SP. While indicating % Power,
the left most digit indicates P and remaining digits indicate power value.
Adjusting SP (Control Setpoint) The SP value can be directly adjusted on the
Lower Readout while the controller is in the MAIN Display Mode and the Lower
readout is showing SP value. If permitted at Supervisory Level, step through
the following sequence for adjusting the SP value:
1. While the Lower Readout shows SP value, press and release UP or DOWN key
once. The Lower Readout starts flashing.
2. Use UP/DOWN keys to adjust the SP value.
3. Press and release ENTER key. The Lower Readout stops flashing and the new
set value is registered and stored.
Tune / Optimize Indication
The controller self detects the events such as new installation, significant
change in SP, etc. for auto tuning itself to the process under control. Also,
the controller can be issued `Optimize’ command by the user for optimization
of the PID constant values.
While the controller is Tuning/Optimizing, the Lower Readout flashes the
message (Busy). The user is advised not to disturb the process or alter any
parameter values while the “Busy” message is being flashed. The “Busy” message
automatically disappears upon completion of Tuning/Optimization.
Timer (Soak) Mode Indication
While Soak Timer is in progress, the front panel indicator SOK’ flashes if the timer is counting down or glows steadily if the timer is in wait / hold state. The Lower Readout can be toggled to display either Control Setpoint (SP) or Balance Soak Time or % Output Power, using ENTER key. While the Lower Readout shows balance soak time the indicatorTMR’ glows.
The Balance Soak time is in either Minutes : Seconds’ orHours : Minutes’ or
Hours’, depending upon the time units selected for the Soak Timer. If the selected time units areHours’, then (a) If the balance time is greater than
100 Hours, the time is shown in Hours’. (b) If the balance time is less than 100 Hours, the time is shown inHours : Minutes’.
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PV Error Indications The process value is said to be in error if it exceeds
the minimum / maximum range specified for the selected Input sensor type or if
the sensor is disconnected (Open or Broken).
The PV Error type is indicated (flashing) on the Upper Readout. For different
errors and the causes refer Table 2.1 below.
Message
Table 2.1 PV Error Type
Over-range PV above Max. Range
Under-range PV below Min. Range
Open Sensor / RTD broken
CONTROL/ALARM STATUS UNDER PV ERROR CONDITIONS
a) The tuning, if in progress, is aborted.
b) The Soak Timer, if in progress, enters in Pause (halt) state.
c) All the control outputs are switched off.
d) For Alarm activation, the under-range condition is treated as minimum PV,
whereas the over-range and open conditions are treated as maximum PV. Thus,
Process High, positive Deviation Band and Window Band alarms activate under
Overrange/Open error. Similarly, Process Low, negative Deviation Band and
Window Band alarms activate under Underrange error.
OPERATOR PAGE AND PARAMETERS The controller provides a separate page that
contains parameters that require frequent settings by the operator. The page
is called Operator Page and the parameters are called Operator Parameters. The
availability of operator parameters is controlled at supervisory level and
these parameters are not affected by the master lock status.
Accessing Operator Page & Adjusting Parameters
Step through the following sequence to open the operator page and to adjust
the operator parameter values.
1. Press and release PAGE key. The Lower Readout shows PAGE and Upper Readout
shows 0.
2. Press ENTER key. The Lower Readout shows prompt for the first available
operator parameter and the Upper Readout shows value for the parameter.
3. Use UP/DOWN keys to adjust the value and then press ENTER key to store the
set value and scroll to next parameter.
The controller automatically reverts to MAIN Display Mode upon scrolling
through the last operator parameter. Alternatively, use PAGE key to return to
MAIN Display Mode.
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The Operator Parameters are described in Table 2.2. Note that the parameters presented on operator page depend upon the functions selected / enabled. The operator parameter list mainly includes : a) Soak Start / Abort Command, if Soak Time feature is enabled. b) The Control Setpoint (SP). c) Alarm-1 Setpoint or Blower Setpoint or Auxiliary Control Setpoint for OP2 depending upon the function selected. d) Alarm-2 Setpoint or Auxiliary Control Setpoint for OP3 depending upon the function selected. e) Lock for Setpoint Editing on Lower Readout.
PAGE 0 : OPERATOR PAGE Table 2.2
Parameter Description
TIMER START COMMAND Set to Yes to start Soak Timer. Not available if timer
already running.
Settings
No Yes
TIMER ABORT COMMAND Set to Yes to abort a running timer.
TIME DURATION The set time value for the soak timer in the selected time
units.
No
Yes
00.05 to 60.00 M:S or
00.05 to 99.55 H:M or
1 to 999 Hours
OP2 Function : Alarm-1 Parameter Description
ALARM-1 SETPOINT Process High / Process Low Alarm-1 Setpoint.
ALARM-1 DEVIATION BAND Positive (+) or Negative (-) Alarm-1deviation band.
ALARM-1 WINDOW BAND Symmetrical Alarm-1 window band.
Settings
Min. to Max. Range for the
Input Type
-1999 to 9999 or -199.9 to 999.9
3 to 999 or 0.3 to 99.9
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OP2 Function : Auxiliary Control
Parameter Description
AUXILIARY CONTROL SETPOINT Positive (+) or Negative (-) offset to Control
Setpoint (SP) for defining Auxiliary Setpoint.
Settings
(Min. Range – SP) to
(Max. Range – SP) for selected Input
OP2 Function : Blower / Compressor Control
Parameter Description
Settings
BLOWER / COMPRESSOR SETPOINT
Positive (+) offset to Control Setpoint (SP) for defining Blower / Compressor
Setpoint.
0 to 250 or 0.0 to 25.0
OP3 Function : Alarm-2 Parameter Description
ALARM-2 SETPOINT Process High / Process Low Alarm-2 Setpoint.
Settings
Min. to Max. Range for the
Input Type
ALARM-2 DEVIATION BAND Positive (+) or Negative (-) Alarm-2 deviation band.
-199 to 999 or -199.9 to 999.9
ALARM-2 WINDOW BAND Symmetrical Alarm-2 window band.
3 to 999 or 0.3 to 999.9
OP3 Function : Auxiliary Control Parameter Description
Settings
AUXILIARY CONTROL SETPOINT
Positive (+) or Negative (-) offset to Control Setpoint (SP) for defining
Auxiliary Setpoint.
(Min. Range – SP) to
(Max. Range – SP) for selected Input
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Control Setpoint (SP) Locking Parameter Description
SETPOINT LOCKING Set to Yes to lock the SP editing on the Lower Readout.
Settings
No Yes
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Section 3 SET-UP MODE : ACCESS AND OPERATION
The various parameters are arranged in different groups, called PAGES,
depending upon the functions they represent. Each group is assigned a unique
numeric value, called PAGE NUMBER, for its access.
The parameters are always presented in a fixed format: The Lower Readout
displays the parameter prompt (Identification Name) and the Upper Readout
displays the set value. The parameters appear in the same sequence as listed
in their respective sections.
SET-UP MODE
The Set-up Mode allows the user to view and modify the parameter values.
Follow the steps below for setting the parameter values:
1. Press and release PAGE key. The Lower Readout shows PAGE and the Upper
Readout shows page number 0. Refer Figure 3.1.
2. Use UP / DOWN keys to set the desired PAGE NUMBER.
3. Press and release ENTER key. The Lower Readout shows the prompt for the
first parameter listed in the set PAGE and the Upper Readout shows its current
value. (If the entered PAGE NUMBER is invalid (contains no parameter list or
any associated function), the controller reverts to the MAIN Display Mode.
4. Press and release the ENTER key until the prompt for the required
parameter appears on the Lower Readout. (The last parameter in the list rolls
back to the first parameter).
5. Use UP / DOWN keys to adjust the parameter value. (The display flashes if
UP key is pressed after reaching the maximum value or DOWN key is pressed
after reaching the minimum value).
6. Press and release the ENTER key. The new value gets stored in the
controller’s non-volatile memory and the next parameter in the list is
displayed.
The Figure 3.1 illustrates the example of altering the value for the parameter
`Input Type’.
Figure 3.1
or
or
Main Display Mode
Default Page
Page Number
First Parameter on Page-10
New Parameter value
Next Parameter on Page-10
Press PAGE key to enter Set-up Mode
Use UP/DOWN key to set the Page Number
Press ENTER key to open the Page
Use UP/DOWN
Press ENTER
keys to change key to store the value &
the value move to next parameter
Notes
1. Each page contains a fixed list of parameters that are presented in a pre-
determined sequence. Note however that availability of a few parameters,
called Conditional Parameters, depend upon the settings for some other
parameters. For example, the parameter Control Hysteresis’ for Output-1 is available only if, the set value for the parameterControl Action’ is `On-
Off’.
2. To exit the set-up mode and return to the MAIN Display Mode, press and
release PAGE key.
3. If no key is pressed for approximately 30 seconds, the set-up mode times
out and reverts to the MAIN Display Mode.
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MASTER LOCKING The controller facilitates locking all the PAGES (except
Operator PAGE) by applying Master Lock Code. Under Locking, the parameters are
available for view only and cannot be adjusted. The Master Lock, however does
not lock the operator parameters. This feature allows protecting the rather
less frequently used parameters against any inadvertent changes while making
the frequently used operator parameters still available for any editing. For
enabling / disabling the Lock, step through the following sequence: Locking 1.
Press and release PAGE key while the controller is in the MAIN Display Mode.
The Lower Readout shows PAGE and the
Upper Readout shows 0. 2. Use UP / DOWN keys to set the Page Number to 123 on
the Upper Readout.
3. Press and release ENTER key. The controller returns to the MAIN Display
Mode with the Lock enabled. The Figure 3.2 below illustrates the Locking
procedure.
Figure 3.2
or
MAIN Display Mode
Press PAGE key to enter Set-up Mode
Default Page
Use UP/DOWN key to set the `Locking Code’
Locking Code
MAIN Display Mode
Press ENTER key to Lock & Return to
Main Mode
UnLocking Repeat the Locking procedure twice for unlocking.
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Section 4 PAGE 10 : I / O CONFIGURATION PARAMETERS
Table 4.1
Parameter Description
INPUT TYPE Refer Table 4.2 for various available `Input Types’ along with
their respective Ranges and Resolutions.
Settings Default Value
Refer Table 4.2 (Default : Type K)
TEMPERATURE DISPLAY UNITS Select as °C’ (Centigrade) or°F’ (Fahrenheit).
TEMPERATURE RANGE This parameter value must be set in accordance with the
Maximum Temperature Range for which the equipment / machine is designed. Set
this parameter value appropriately as the same is used by the controller to
determine whether or not to Self-Tune / Optimize the controller upon detecting
the “Tune at Setpoint Change” condition.
°C °F (Default : °C)
Min. to Max. specified for the selected Input Type
(Refer Table 4.2) (Default : 1376)
CONTROL OUTPUT TYPE Refer Table 4.3 for the available options.
Refer Table 4.3 (Default : Relay)
CONTROL MODE On-Off The control algorithm tends to maintain the PV at SP by
either switching the output (say, Heater) fully OFF or fully ON. The On and
Off switching is differentiated by the user settable Hysteresis Band’. PID The control algorithm uses a 2nd order equation to compute the% Output
Power’ required to maintain the PV at SP. The constants P, I, D are
automatically set by the controller.
CONTROL LOGIC Direct Cooling Control (Output Power increases with increase in
PV). Reverse Heating Control (Output Power decreases with increase in PV).
HYSTERESIS
(For ON-OFF Control only) Sets a differential (dead) band between the ON and
OFF states. Keep it large enough to avoid frequent switching of the load
without losing the desired control accuracy.
On-Off PID (Default : PID)
Direct Reverse (Default : Reverse)
1 to 999°C or 0.1 to 99.9°C (Default : 2 or 0.2)
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Parameter Description
SETPOINT LOW LIMIT This parameter sets the minimum limit on the Control
Setpoint value.
SETPOINT HIGH LIMIT This parameter sets the maximum limit on the Control
Setpoint value.
Settings Default Value
Min. Range to Setpoint High for the selected Input Type
(Default : -200)
Setpoint Low to Max. Range for the selected Input Type
(Default : 1376)
Option
What it means
Type J Thermocouple
Table 4.2
Range (Min. to Max.)
0 to +960°C / +32 to +1760°F
Resolution (Fixed or settable)
Type K Thermocouple -200 to +1376°C / -328 to +2508°F
Type T Thermocouple -200 to +385°C / -328 to +725°F
Type R Thermocouple Type S Thermocouple Type B Thermocouple
0 to +1770°C / +32 to +3218°F 0 to +1765°C / +32 to +3209°F 0 to +1825°C / +32 to +3092°F
Fixed 1°C / 1°F
Type N Thermocouple
0 to +1300°C / +32 to +2372°F
3-wire, RTD Pt100
-199 to +600°C / -328 to +1112°F
3-wire, RTD Pt100
-199.9 to 600.0°C / -199.9 to 999.9°F
0.1°C / 0.1°F
Option
Table 4.3
What it means
Relay SSR (Solid State Relay)
Remarks
Applicable for OP1 as Relay / SSR
0 to 20 mA current 4 to 20 mA current
Applicable for OP1 as DC Linear Current
0 to 5 Volts 0 to 10 Volts
Applicable for OP1 as DC Linear Voltage
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Section 5 PAGE 12 : OP2 FUNCTION PARAMETERS
Table 5.1
Parameter Description
Settings Default Value
OUTPUT-2 FUNCTION SELECTION
None OP2 module not installed or function not used. Alarm OP2 relay activates
as Alarm status. Auxiliary Control OP2 relay activates as Auxiliary control
status. Blower OP2 relay activates as Blower / Compressor control status.
None Alarm Control Blower (Default : None)
User Manual
OP2 Function : Alarm-1
Parameter Description
TYPE Process Low The alarm activates for PV less than or equal to Alarm
Setpoint. Process High The alarm activates for PV greater than or equal to
Alarm Setpoint. Deviation Band The alarm activates if the PV deviation from SP
is greater than the set positive or negative Deviation Band’ value. Window Band The alarm activates if the PV deviation from SP is greater than the set Window Band’ value in either direction. End Of Soak The OP2 Relay / SSR is
switched ON for the time duration set for the parameter Alarm Timer’. SETPOINT Available forProcess High’ or `Process Low’ Alarms. Sets the Upper (Process
High) or Lower (Process Low) Alarm Limit.
Settings Default Value
Process Low Process High Deviation Band Window Band End of Soak (Default :
Process Low)
Min. to Max. Range for the selected Input type
(Default : 0)
DEVIATION BAND Available for Deviation Band’ Alarm. Sets a deviation band above (Positive value) or below (Negative value) the SP for alarm activation. WINDOW BAND Available forWindow Band’ Alarm. Sets a symmetrical band above
and below the SP for alarm activation.
-199 to 999 or -199.9 to 999.9
(Default : 0)
3 to 999 or 0.3 to 999.9 (Default : 3)
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Parameter Description
LOGIC Normal The Alarm output (Relay/SSR) remains ON under alarm condition;
OFF otherwise. Useful for Audio / Visual Alarm. Reverse The Alarm output
(Relay / SSR) remains OFF under alarm condition; ON otherwise. Useful for
Tripping the system under control.
INHIBIT No Alarm is not suppressed for start-up condition. Yes The Alarm
activation is inhibited (suppressed) until the PV is found within alarm limits
from the time the controller is switched ON.
ALARM TIMER
Available for End of Soak Alarm. Sets time duration in seconds for which the
alarm shall activate upon end of soak timer.
Settings Default Value
Normal Reverse (Default : Normal)
Yes No (Default : Yes)
5 to 250 Seconds (Default : 10)
OP2 Function : Auxiliary Control Parameter Description
Settings Default Value
OFFSET VALUE
Offset value for the Auxiliary Control Setpoint. Can be set as positive value
or negative value.
Auxiliary Control Setpoint = Control Setpoint (SP) + Offset Value
(Min. Range – SP) to (Max. Range – SP) specified for the selected Input Type
(Default : 0)
HYSTERESIS
Sets a differential (dead) band between the ON and OFF control states.
1 to 999 or 0.1 to 999.9 (Default : 2 or 0.2)
CONTROL LOGIC
Normal The Output
remains
ON
for
PV
below
Setpoint
and
OFF
otherwise.
Reverse The Output
remains
ON
for
PV
above
Setpoint
and
OFF
otherwise.
Normal
Reverse (Default : Normal)
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OP2 Function : Blower / Compressor Control
Parameter Description
Settings Default Value
OFFSET VALUE
Sets a positive (+) offset to the SP to define the `Blower / Compressor
Setpoint’.
Blower / Compressor Setpoint = Control Setpoint (SP) + Offset Value
0 to 250 or 0.0 to 25.0 (Default : 0)
HYSTERESIS Differential (dead) band between the blower ON and OFF states.
1 to 250 or 0.1 to 250.0 (Default : 2 or 0.2)
TIME DELAY
This parameter is mainly used for Compressor Load. The set time delay is
elapsed each time before the compressor is switched ON. Set the value to 0 if
no Time Delay is required.
00.00 to 10.00 Min. Sec (in steps of 5 Seconds)
(Default : 00.00)
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Section 6 PAGE 13 : OP3 FUNCTION PARAMETERS
Table 6.1
Parameter Description
OUTPUT-3 FUNCTION SELECTION
None OP2 module not installed or function not used. Alarm OP2 relay activates
as Alarm status. Auxiliary Control OP2 relay activates as Auxiliary control
status. Water Level Low Alarm OP3 relay activates if water level is Low.
Settings Default Value
None Alarm Control Water Level Low Alarm (Default : None)
OP3 Function : Alarm-2
Parameter Description
TYPE Process Low The alarm activates for PV less than or equal to Alarm
Setpoint. Process High The alarm activates for PV greater than or equal to
Alarm Setpoint. Deviation Band The alarm activates if the PV deviation from SP
is greater than the set positive or negative Deviation Band’ value. Window Band The alarm activates if the PV deviation from SP is greater than the set Window Band’ value in either direction. End Of Soak The OP2 Relay / SSR is
switched ON for the time duration set for the parameter Alarm Timer’. SETPOINT Available forProcess High’ or Process Low’ Alarms. Sets the Upper (Process High) or Lower (Process Low) Alarm Limit. DEVIATION BAND Available forDeviation Band’ Alarm. Sets a deviation band above (Positive
value) or below (Negative value) the SP for alarm activation.
Settings Default Value
Process Low Process High Deviation Band Window Band End of Soak (Default :
Process Low)
Min. to Max. Range for the selected Input type
(Default : 0)
-199 to 999 or -199.9 to 999.9
(Default : 0)
WINDOW BAND
Available for `Window Band’ Alarm. Sets a symmetrical band above and below the
SP for alarm activation.
3 to 999 or 0.3 to 999.9 (Default : 3)
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Parameter Description
LOGIC Normal The Alarm output (Relay/SSR) remains ON under alarm condition;
OFF otherwise. Useful for Audio / Visual Alarm. Reverse The Alarm output
(Relay / SSR) remains OFF under alarm condition; ON otherwise. Useful for
Tripping the system under control.
INHIBIT No Alarm is not suppressed for start-up condition. Yes The Alarm
activation is inhibited (suppressed) until the PV is found within alarm limits
from the time the controller is switched ON.
ALARM TIMER
Available for End of Soak Alarm. Sets time duration in seconds for which the
alarm shall activate upon end of soak timer.
Settings Default Value
Normal Reverse (Default : Normal)
Yes No (Default : Yes)
5 to 250 Seconds (Default : 10)
OP3 Function : Auxiliary Control Parameter Description
Settings Default Value
OFFSET VALUE Offset value for the Auxiliary Control Setpoint. Can be set as
positive value or negative value.
Auxiliary Control Setpoint = Control Setpoint (SP) + Offset Value
(Min. Range – SP) to (Max. Range – SP) specified for the selected Input Type
(Default : 0)
HYSTERESIS Sets a differential (dead) band between the ON and OFF control
states.
CONTROL LOGIC Normal The Output remains ON for PV below Setpoint and OFF
otherwise.
Reverse The Output remains ON for PV above Setpoint and OFF otherwise.
1 to 999 or 0.1 to 999.9 (Default : 2 or 0.2)
Normal Reverse (Default : Normal)
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Section 7 PAGE 14 : PID CONTROL PARAMETERS
Table 7.1
Parameter Description
Settings Default Value
% OUTPUT POWER
This is a view only parameter that facilitates the indication of `% Output
Power’ computed by the controller PID algorithm. The computed value lies
between Min. power (0.0%) and Max. power (100.0%).
Not Applicable (Default : Not Applicable)
CYCLE TIME
(For PID’ Control) For time-proportionating PID control, the output power is implemented by adjusting the ratio of ON : OFF to a fixed time interval, calledCycle Time’. The larger the power the larger the ON time and
vice-a-versa.
Larger Cycle time ensures longer Relay/SSR life but may result in poor control
accuracy and vice-a-versa.The recommended Cycle Time values are; 20 sec. for
Relay and 1 sec. for SSR.
0.5 to 120.0 Seconds (in steps of 0.5 secs.)
(Default : 0.5)
PROPORTIONAL BAND
(For PID’ Control) The Proportional band is defined in terms of process value deviation from the setpoint (also known as process error). Within the band the output power is varied from maximum (100%) at maximum deviation to minimum (0%) at minimum deviation. The process value thus tends to stabilize at a point within the band where the power input equal losses. Larger Band results in better stability but larger deviation. The Proportional Band value is automatically calculated by controller’s Self- Tune feature and seldom requires any manual adjustment. INTEGRAL TIME (ForPID’ Control) The application of proportional band alone results in
process value stability within the band but away from the setpoint. This is
called steady state Offset Error. The integral action is incorporated for
automatic removal of offset error with minimum ocillations.
The Integral Time value is automatically calculated by controller’s Self-Tune
feature and seldom requires any manual adjustments.
0.1 to 999.9 (Default : 10.0)
0 to 1000 Seconds (Default : 100)
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Parameter Description
DERIVATIVE TIME (For `PID’ Control) It is desired that the controller should
respond to any dynamic changes in the process conditions (like variations in
load, power supply fluctuations, etc.) fast enough so as retain the process
value near the setpoint. The derivative time determines how strong the output
power will change in response to the rate of change of measured PV.
The Derivative Time value is automatically calculated by controller’s Self-
Tune feature and seldom requires any manual adjustments.
User Manual
Settings Default Value
0 to 250 Seconds (Default : 25)
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Section 8 PAGE 15 : SOAK TIMER PARAMETERS
(Refer end of this section for detailed Soak Timer Operation)
User Manual
Table 8.1
Parameter Description
TIMER ENABLE Yes Soak Timer function and Start / Abort commands are enabled.
No Soak Timer function and Start / Abort commands are disabled.
TIME UNITS Select the time units depending on the minimum and/or maximum time
value required.
TIME DURATION
The preset time value in selected units for the Soak Timer.
TIMER-START BAND
After issuance of start command, the timer starts counting down once the PV
enters the process band around SP defined by this parameter value.
HOLDBACK STRATEGY None PV based timer pause is not required. Up Timer is
paused if PV is outside holdband above SP. Down Timer is paused if PV is
outside holdband below SP. Both Timer is paused if PV is outside holdband both
above and below SP.
HOLD BAND Sets the temperature limit(s) with respect to the SP for the timer
to pause. The timer holds on counting should the PV cross the limit(s).
SWITCH-OFF CONTROL OUTPUT AT TIMER END Yes The control output (OP1) is forced
off upon completion of timer. No The control output state is not forced.
Settings Default Value
No Yes (Default : No)
Min:Sec Hours:Min Hours (Default : Min: Sec) 00.05 to 60:00 Min:Sec 00.05 to
99:55 Hrs:Min 1 to 999 Hours (Default : 00.10 Min:Sec)
0 to 9999 or 0.0 to 999.9 (Default : 5 or 0.5)
None Up Down Both (Default : None)
1 to 9999 or 0.1 to 999.9 (Default : 5 or 0.5)
No Yes (Default : No)
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Parameter Description
POWER-FAIL RECOVERY METHOD Abort The timer operation is suspended until a new
start command is issued. Start The timer re-runs the complete soak time.
Continue The Soak Timer resumes operation for the balance time.
Figure 8.1
SOAK TIMER OPERATION
Settings Default Value
Abort (Re)Start Continue (Default : Continue)
PV
Start Band
SP
PV
PV enters start band,
Timer count down starts
Set Time
Time
Basic Operation The Soak Timer is essentially a preset timer that can be
configured to run as :
(a) A Free Running Timer by setting timer Start Band’ to 0. That is, the timer starts counting down immediately upon issuance of Start Command by the user and continues until set time is elapsed. (b) A Setpoint Dependent Timer. That is, after issuance of Start Command, the count down starts only after the PV reaches within timerStart Band’. The
timer start band is a symmetrical band centered around the SP. For example,
for a start band of 2°C and SP value of 100°C, the count down begins once the
PV reaches a value within 98°C (SP – Start Band) to102°C (SP + Start Band).
Note that, once the PV enters Start Band’, the timer continues to run regardless of whether the PV remains within or outside theStart Band’.
Hold Band Operation The timer is also provided with a Hold Band’ that can be enabled to make sure that the timer counts down only while the PV is within theHold Band’. That is, the timer pauses (holds counting down) whenever the
PV is outside the Hold Band’. TheHold Band’ is set with respect to the SP
and can be set above or below or above and below the SP. For example, a 5 °C
Hold Band below the SP (say,100°C) will force the timer in pause state
whenever the PV is equal or less than 95°C (SP – Hold Band).
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Power-fail Recovery Modes The timer facilitates 3 different power-fail
recovery modes, viz., Continue, Re-start and Abort. In Continue mode, the
timer resumes to execute the balance soak time once the PV is detected within
Hold Band. In Re-start mode, the timer executes the complete set time all over
again. In Abort mode, the timer stops execution until a start command is
issued.
End-of-Soak Events
The output Relay/SSR modules, OP2 and/or OP3, can be configured as End-of-Soak
Alarm with a settable alarm duration. That is, upon completion of Soak Time
execution, the Relay energizes (say, to activate a buzzer) for the set alarm
duration.
Additionally, the controller provides `Output-Off’ strategy that can be
enabled to force the control output OP1 off upon End-ofSoak. The output
becomes active again after issuance of Start Command for the execution of a
new Soak Time Cycle.
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Section 9 PAGE 11 : SUPERVISORY PARAMETERS
Table 9.1
Parameter Description
Settings Default Value
TUNE / OPTIMIZE COMMAND
(For PID Control Mode only) Set to `Yes’ for initiating Tune / Optimize
operation.
No Yes (Default : No)
User Manual
TUNE / OPTIMIZE ABORT COMMAND
(For PID Control Mode only) Set to Yes’ for terminating Tune / Optimize operation in progress. OVERSHOOT INHIBIT (For PID Control Mode only) Set this parameter toEnable’ if the process
exhibits unacceptable overshoot upon start-up or a step change in SP. If
enabled, the controller controls the rate of change of PV to minimize
overshoot.
No Yes (Default : No)
Disable Enable (Default : Disable)
OVERSHOOT INHIBIT FACTOR
This parameter adjusts the effectiveness of the Overshoot Inhibit feature.
Increase the value if the overshoot is curbed but the PV takes longer to reach
the SP. Decreases the value if the overshoot persists.
SELF-TUNE ON SETPOINT CHANGE
Enable Re-tune the controller if there is a substantial (large) change in the
SP value. The P, I, D values are optimized. Disable Ignore any change in SP
value and continue with the existing P, I, D values.
1.0 to 2.0 (Default : 1.2)
Disable Enable (Default : Disable)
OFFSET FOR PV
This parameter adds positive or negative offset to the measured PV for removal
of thermal gradient or known sensor error.
DIGITAL FILTER FOR PV
This value determines the averaging rate of measured PV and thus helps
removing undesired rapid changes in the measured PV. The higher the filter
value the better the averaging but the slower the response to actual changes.
-1999 to 9999 or -199.9 to 999.9
(Default : 0)
0.5 to 25.0 Seconds in steps of 0.5 Seconds
(Default : 1.0)
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Parameter Description
PERMISSION FOR OP2/OP3 SETPOINT EDITING ON OPERATOR PAGE This parameter allows
the user to enable (permit) or disable (restrict) the adjustment of the
Setpoint for OP2 / OP3 functions.
SOAK ABORT COMMAND ON OPERATOR PAGE This parameter allows the user to enable
(permit) or disable (restrict) the issuance of Abort’ command from operator page to Abort (Stop) the running Soak Timer. SOAK TIME ADJUSTMENT ON OPERATOR PAGE This parameter allows the user to enable (permit) or disable (restrict) the adjustment of theSoak Time Duration’ on
Operator Page.
UTILITY OPTION This parameter assigns one of the following functions to the
Digital Input. None Digital Input is unused. Soak Start Digital Input is used
for issuing Soak Timer Start Command. An open to close contact will initiate
the Soak Timer. Water Level Low Digital Input is used for detecting Low Water
Level.
WATER LEVEL-LOW DETECTION LOGIC This parameter is available if Digital Input
is used for Low Water Level Detection. Set to Open’ orClose’ depending upon
whether contact-open or contact-close means water low detection.
SLAVE ID This parameter assigns a unique identification number that the Master
Device can use to address the instrument for any communication data
transactions. The settable values are from 1 to 127.
BAUD RATE This parameter defines the communication speed expressed in “Bits
per second”. The Baud Rate must be set to match the Baud Rate set for the
Master Device.
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User Manual
Settings Default Value
Disable Enable (Default : Enable) Disable Enable (Default : Enable)
Disable Enable (Default : Enable)
None (Unused) Soak Start Command Water Level Low Detection
(Default : None)
Open Close (Default : Open)
1 to 127 (Default : 1)
4800 9600 19200 (Default : 9600)
Zenex Pro
Parameter Description
PARITY Parity setting for serial communication protocol
COMMUNICATION WRITE ENABLE Yes The Read/Write parameters can be accessed for
both reading and writing. No The Read/Write parameters can only be accessed
for reading. That is, the parameter values cannot be altered through serial
communication.
User Manual
Settings Default Value
None Even Odd (Default : Even)
No Yes (Default : Yes)
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Section 10 MECHANICAL INSTALLATION
User Manual
OUTER DIMENSIONS AND PANEL CUTOUT The Figure 10.1 shows the controller outer dimensions.
48mm (1.89in)
Figure 10.1
48mm (1.89in)
OP1 OP2 OP3 COM
Zenex Pro
SOK TMR WLO
L1
94mm (3.70in)
Front View
7mm (0.276in)
Side View
PANEL CUTOUT The Figure 10.2 shows the panel cutout requirements for a single
controller.
Figure 10.2
Parameter
Dimensions
mm
inches
V
H
45 (-0, +0.5) 1.77 (-0, +0.02)
V
45 (-0, +0.5) 1.77 (-0, +0.02)
H
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PANEL MOUNTING Follow the steps below for mounting the controller on panel: 1.
Prepare a square cutout to the size shown in Figure 10.2. 2. Remove the Panel
Mounting Clamp from the controller Enclosure and insert the rear of the
controller housing through the
panel cutout from the front of the mounting panel. 3. Hold the controller
gently against the mounting panel such that it positions squarely against the
panel wall, see Figure
10.3. Apply pressure only on the bezel and not on the front label. 4. Insert
the mounting clamps on either side of the controller in the slots provided for
the purpose. Rotate the screws clock-
wise so that they move forward until they push firmly against the rear face of
the mounting panel for secured mounting.
Figure 10.3
Bezel
Controller
Clamps
Mounting Panel with Square Cutout
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Section 11 ELECTRICAL CONNECTIONS
User Manual
WARNING MISHANDLING / NEGLIGENCE CAN RESULT IN PERSONAL DEATH OR SERIOUS
INJURY.
1. The user must rigidly observe the Local Electrical Regulations.
2. Do not make any connections to the unused terminals for making a tie-point
for other wires (or for any other reasons) as they may have some internal
connections. Failing to observe this may result in permanent damage to the
controller.
3. Run power supply cables separated from the low-level signal cables (like
RTD, DC Linear (Voltage) signals, etc.). If the cables are run through
conduits, use separate conduits for power supply cable and low-level signal
cables.
4. Use appropriate fuses and switches, wherever necessary, for driving the
high voltage loads to protect the controller from any possible damage due to
high voltage surges of extended duration or short-circuits on loads.
5. Take care not to over-tighten the terminal screws while making
connections.
6. Make sure that the controller supply is switched-off while making/removing
any connections or removing the controller from its enclosure.
CONNECTION DIAGRAM
The Electrical Connection Diagram is shown on the top side of the enclosure.
The diagram shows the terminals viewed from the REAR SIDE with the controller
label upright. The connecters provided for wiring are pluggable male-female
type. The female parts are soldered on the controller PCBs while the male
parts are with screws and removable. The rear panel electrical wiring
connection diagram is shown in Figure 11.1.
Figure 11.1
Relay / SSR Control Output Version
DC mA/V Control Output Version
PV INPUT
+TC Pt100
OUTPUT1 SSR RS485
– + B+ B-
17 16 15 14 13 12 11 10
OUTPUT2
OUTPUT3
18
9+
SSR NC C NO
(**) RLY
RLY
(**) NC C NO
SSR
–
19
8-
20
7
Digital Input
21
6
1
2
3
4
5
(*)
L
N
85~264
VAC
NO C
Relay OUTPUT1
(*) Digital Input not available in Output 3 Relay Configuration (**) 3 Terminals for Output 2 & Output 3 in Relay Configuration
PV INPUT
+TC
OUTPUT1
Pt100
V/mA +-
RS485
B+ B-
17 16 15 14 13 12 11 10
OUTPUT2
OUTPUT3
18
9+
SSR NC C NO
(**) RLY
RLY
(**) NC C NO
SSR
–
19
8-
20
7
21
6
Digital Input
(*)
1
2
3
4
5
L
N
85~264
VAC
(*) Digital Input not available in Output 3 Relay Configuration (**) 3 Terminals for Output 2 & Output 3 in Relay Configuration
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DESCRIPTIONS The back panel connections are described as under: PV INPUT : RTD Pt100, 3-wire / Thermocouple (Terminals : 17, 16, 15) Connect 3-wire RTD Pt100 sensor or Thermocouple as shown below.
Figure 11.2 (a)
Figure 11.2 (b)
–
17 16 15
17 16 15
RTD Pt100, 3-wire
Thermocouple
RTD Pt100, 3-wire Connect single leaded end of RTD bulb to terminal 17 and the double leaded ends to terminal 16 and 15 (interchangeable) as shown in Figure 11.2 (a). Use low resistance copper conductor leads of the same gauge and length. Avoid joints in the cable.
Thermocouple Connect Thermocouple Positive (+) to terminal 17 and Negative (-) to terminal 16 as shown in Figure 11.2 (b). Use correct type of extension lead wires or compensating cable. Avoid joints in the cable.
OUTPUT1 : Control Output – Relay (Terminals : 3, 4) Control Output – SSR
(Terminals : 12, 13) Control Output – V/mA (Terminals : 13, 14)
OUTPUT2 : Alarm / Control – Relay (Terminals : 18, 19, 20) Alarm / Control –
SSR (Terminals : 18, 19)
OUTPUT3 : Alarm / Control – Relay (Terminals : 7, 8, 9) Alarm / Control – SSR
(Terminals : 8, 9)
Relay & SSR Control Outputs are available as standard. V / mA Control Output
is available on request.
+-
14 13
Ouput1 V/mA
Figure 11.3
NO
3 9 18
C
4 8 19
NC
7 20
Output1/ Output2 / Output3 Relay
9 12 18 8 13 19
Output1/ Output2 / Output3 SSR
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mA / V Output The Positive (+) of mA / V is available at Terminal 14 & the
Negative (-) at Terminal 13.
Relay Output Potential-free Relay changeover contacts NO (Normally Open) and C
(Common) rated 10A/240 VAC (resistive load).
SSR Output Connect (+) and (-) terminals of SSR to (+) and (-) terminals of
controller, respectively. Use Zero-Crossover, 3 to 30 VDC operated SSR.
Digital Input : Low Water-Level Detection or Timer Start Command Digital Input
(Terminals : 6, 7) Potential-free contact closure input terminals are provided
as digital input. This input can either be used for low water level detection
or for issuance of timer start command. When used as water level detection, an
user programmable Open’ orClose’ switch position is detected as water level
low. When used as timer start command, an Open to Close transition issues
start command.
Figure 11.4
7
6
RS485 : Serial Communication Port (Terminals 10, 11)
Connect terminal 11 and 10 of the controller to (+) and (-) RS485 terminals of
the Master device.
To ensure reliable operation of the Serial Communication Link (without data
corruption due to line noise or reflections), use a pair of twisted wires
inside screened cable with the terminating resistor (100 to 150 Ohms) at one
end, as shown in Figure 11.5 below.
B+
HOST
BMaster Device
Figure 11.5 Terminating Resistor (100 to 150 Ohms)
Screened Cable
Twisted Wire Pair
10 B-
11 B+
Serial Comm. Terminals
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85~264 VAC : Power Supply (Terminals 1, 2)
The controller is supplied with power connections suited for 85 to 264 VAC
line supply. Use well-insulated copper conductor wire of the size not smaller
than 0.5mm2 for power supply connections. Connect Line (Phase) supply line to
terminal 1 and the Neutral (Return) supply line to terminal 2 as shown in
Figure 11.6 below. The controller is not provided with fuse and power switch.
If necessary, mount them separately. Use a time lag fuse rated 1A @ 240 VAC.
Line Neutral
Fuse
Figure 11.6
2 Pole Isolating Switch
Power Supply Terminal
1L
2N
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Dec 2021
Process Precision Instruments
101, Diamond Industrial Estate, Navghar, Vasai Road (E), Dist. Palghar – 401
210.Maharashtra, India Sales : 8208199048 / 8208141446 Support : 07498799226 /
08767395333 sales@ppiindia.net, support@ppiindia.net
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