EZ-ZONE RMT Controller
Rail Mount TC Heater Engine Temperature
with Integrated Safety Limit Controller
User Manual

EZ-ZONE RMT Rail Mount TC Heater Engine Temperature

Technical Assistance

If you encounter a problem with your Watlow ® controller, review your configuration information to verify that your selections are consistent with your application: inputs, outputs, alarms, limits, etc. If the problem persists, you can get technical assistance from  your local Watlow representative (see back cover), by emailing your questions to [email protected] or by dialing +1 507-494-5656 between 7 AM and 5 PM.Central Time USA & Canada. Ask for an Applications Engineer. Please have the  complete model number available when calling.

Return Material Authorization (RMA)

1. Call Watlow Customer Service, 507-454-5300, for a Return Material Authorization (RMA) number before returning any item for repair. If you do not know why the product failed, contact an Application Engineer or Product  Manager.
   All RMA’s require:
   • Ship-to address
   • Bill-to address
   • Contact name
   • Phone number
   • Method of return shipment
   • Your P.O. number
   • Detailed description of the problem
   • Any special instructions
   • Name and phone number of person returning the product

2. Prior approval and an RMA number from the customer service department is required when returning any product. Make sure the RMA number is on the outside of the carton and on all paperwork returned. Ship on a freight prepaid basis.

3. After we receive your return, we will examine it to verify the reason for the product failure. Unless otherwise agreed to in writing, Watlow’s standard warranty provisions, which can be located at, www.watlow.com/terms, will apply to any failed product.

4. In the event that the product is not subject to an applicable warranty, we will quote repair costs to you and request a purchase order from you prior to proceeding with the repair work.

5. Watlow reserves the right to charge for no trouble found (NTF) returns.

Warranty
The Watlow EZ-ZONE RMT Controller is warranted by Watlow in accordance with the terms and conditions set forth on Watlow’s website at www.watlow.com/terms.
Registered Trademarks
Watlow® is a registered trademark of Watlow Electric and Manufacturing Company. UL® is a registered trademarks of Underwriter’s Laboratories, Inc.

Safety Information

Safety Information
We use Note, Caution and Warning symbols throughout this book to draw your attention to important operational and safety information.
A “NOTE” marks a short message to alert you to an important detail.
A “CAUTION” safety alert appears with information that is important for protecting your equipment and performance. Be especially careful to read and follow all cautions that apply to your application.
A “WARNING” safety alert appears with information that is important for protecting you, others and equipment from damage.
Pay very close attention to all warnings that apply to your application.
The electrical hazard symbol (a lightning bolt in a triangle) precedes an electric shock hazard CAUTION or WARNING safety statement.

Symbol

| Explanation
---|---

“NOTE”

| An important detail or recommendation
| The safety alert symbol, (an exclamation point in a triangle) precedes a CAUTION or WARNING statement.
A “CAUTION” safety alert is important for protecting your equipment and performance.
A “WARNING” safety alert is important for protecting you, others and equipment from damage.
| Electrical Shock Hazard – Symbol (a lightning bolt in a triangle) precedes an electric shock hazard CAUTION or WARNING safety statement.
| ESD Sensitive product, use proper grounding and handling techniques when installing or servicing product.
| Do not throw in trash, use proper recycling techniques or consult manufacturer for proper dispos- al.
| Unit is a Listed Device per Underwriters Laboratories. For more detail search for File E502994 on ww w.ul.com .
| Low Voltage (Safety) Directive. Unit passes industrial immunity levels for EMC, but additional filtering is required to pass radiated and conducted emissions. RMT is not currently CE approved.
|

Overview

Overview
The RMT Controller is a temperature controller with an integrated safety limit. The RMT Controller MUST Be used in conjunction with a Watlow designed thermocouple heater (Series _ Heater). The RMT Controller used in conjunction with the Watlow  specific heater creates a thermal system. The thermal system allows for control of each zone, whereby the RMT Controller offers up to 12 zones per module. Each zone offers both input and output circuitry. In addition, the RMT Controller offers a built in  certified safety limit (relay output). The safety relay is a mechanical relay that shall latch open (fail safe condition) upon an unsafe condition. A manual reset (power cycle) is required to reset the safety relay. Note: Clearing the safety can also be performed in  software if user is connected to the RMT.
The safety relay shall be incorporated in series with a mechanical contactor (not provided by Watlow). The mechanical contactor shall be wired in accordance with the application’s safety requirements.

Theory of Operation
The RMT Controller supplies power to heaters through TC wires that also perform temperature and resistance checks while also monitoring power.
The RMT Controller functions to maximize control while minimizing wiring. This is accomplished by utilizing power over thermal wiring to product specific heaters for monitor and control.
Description of Sensor Inputs
The RMT inputs are compatible with heaters that have been designed to work in conjunction with the RMT Controller. Each heater is designed with thermocouple alloy wire connected to the heater element that is then connected to the RMT Controller input  connector(s). Only the positive and negative wires of the thermocouple wires are terminated at the RMT Controller connectors. Both temperature measurement and power delivery are delivered through a single pair of thermocouple wires.
Description of Power to Heater Outputs
Each RMT Controller output is composed of a solid-state switch capable of a maximum of 0.75 Ampere. The solid-state switch (output) delivers power to a heater that is connected via thermocouple alloy wires. Power is delivered to the RMT in the form of AC  voltage. The voltage is adjustable (power conversion) based upon the process variables required (set point and load). The output turns off momentarily to measure the temperature of the heater (TC measurement created via a TC junction made in conjunction  with the heater element). In addition, each RMT Controller input is wired in series with a safety relay that will interrupt power to the output upon multiple safety directives determined by ISO 13849 (Category 2 and performance Level C). Some of which are listed below.

Safe Use Requirements
Each of the items listed in the table below must be reviewed for safe and proper operation.
Table 1:

Potential Failure Mode| Detectable| Potential Effect(s) of Failure| Potential Causes(s) / Mechanism(s) of Failure
---|---|---|---
Wrong sensor input type| No| Heater over temp| Incorrect configuration or heater
Reversed sensor wires| Yes| Heater over temp| Wrong heater construction
Heater connected without ther- mocouple alloy (constructed with copper wire)| No| Heater over temp| Wrong heater construction
Length of sensor wire from heater to controller| No| Resistance limit errone- ously trips| Additional resistance from lead wire.
Shorted heater (large resistance change)| Yes| Hot spot in heater| Internal element short
Shorted heater (small resistance change)| No| Hot spot in heater| Internal element short
Shorted heater to pipe (earth ground)| No| Heater over temp caused by incorrect sensor values| Grounded mounting screw pierc- ing heater
Shorted heater to AC supply| No| Heater over temp caused by incorrect sensor values| None identified
Shorted thermocouple lead wires| Yes| Sensor measurement incorrect| Lead wires short
Migrate controller from one sys- tem to another system| No| Over temp condition| Incorrect heater setup could cause over temp condition
Mismatched controller to heat- er(s)| No| Setpoint too high for heater type| Setpoint too high for heater type
Open heater| Yes| No heat| Failed heater
Open thermocouple| Yes| Same as open heater| Failed thermocouple connection
Compromised signal to the safety relay coil| Yes| Over temp – can’t turn heater power off in a failure state| Trace failure
Welded contacts on safety relay| Yes| Over temp – can’t turn heater power off in a failure state| Component failure
Over voltage of supply to heater| Yes| Heater over temp| User applies incorrect voltage. Hardware failure
User enters incorrect thermal off- set parameters (dynamic offset)| No| Heater over temp| User enters incorrect thermal offset parameters
User enters incorrect tempera- ture limit| No| Heater over temp| Correct temperature limit not entered correctly.
---|---|---|---
User enters incorrect resistance limits| No| Heater over temp| Correct temperature limit not entered correctly.
Calibration is incorrect| No| Heater over temp| Correct calibration
Excessive calibration drift| Yes| Heater over temp| Hardware failure
Interlock contactor not connect- ed.| No| Heater over temp| Interlock contactor not connected.
Heater/sensor over temperature| Yes| Heater over temp| Failed hardware

Description and importance of each item from the table above:
Wrong sensor input type – Matching the controller’s thermocouple input type to the heaters thermocouple alloy(s) is required for safe and proper operation. The menu operation for the controller is parameter “Input Type” identified within the controllers’  operation menu or via dashboard and the thermocouple alloy of the heater is identified by the model number.
Reversed Sensor Wires – Should the heater decrease in temperature upon power up (output “On”), the heater is incorrectly constructed (the sensor wires are reversed internally to the heater) and the heater must be removed from the system and replaced with a  new properly constructed heater.
Heater constructed without thermocouple alloy (heater constructed with copper wire) – Only heaters that are constructed with thermocouple alloy can be connected to the RMT Controller and must be matched to the input type of the RMT Controller. Any heater  that is not constructed from thermocouple alloy may result in serious damage to thermal system and connected component/equipment and associated facilities and personnel.
Length of sensor wire from heater to controller too long – Each heater has been programmed to its’ mating controller and should function under normal conditions. If the resistance error trips, it may be due to excessive lead wire length from the controller to the  heater. Extra wire length should not be added to the wire harness that was shipped with the heater assembly.
Large resistance changes in heater – Heater parameters (resistance tolerances) should already be entered into the RMT Controller. Should the resistance change significantly, a hot spot within the heater may occur. The RMT Controller will detect a significant  change and open the Safety Shutdown Relay.
Shorted heater to pipe (earth ground) – An introduction of earth ground to the heater circuit (by way of an inadvertent short) will result in incorrect temperature measurement and thermal runaway. To assure a safe system, a standard ELCI (Electronic Leakage  Circuit Interrupter) should be incorporated in series with the load.
Shorted heater to AC voltage supply – An introduction of AC voltage to the heater circuit by way of an inadvertent short will result in incorrect temperature measurement and thermal runaway. This condition is not detectable by the RMT Controller Shorted thermocouple lead wires – Should the thermocouple lead wires short, the RMT Controller will recognize this as a change in resistance and will result in an Safety Shutdown Relay open relay condition.
Migrate a controller from one system to another system – Removing an RMT Controller from one system and placing it into another system may result in unsafe and incorrect operation of the thermal system. Reviewing controller parameters to be certain the  thermal system will operate safely is required. Otherwise, only factory configured (programmed specifically for the application requiring the replacement) RMT modules should be used in replacement of another RMT module.
Mismatched controller to heater – Only thermocouple alloy heaters may be used with the RMT Controller. The thermocouple alloy must be matched to the input type of the RMT Controller. In addition, all process set point values of the RMT Controllers must be  reviewed by the user to be certain the heater that is connected to the RMT Controller has been constructed to operate at the process set point of the RMT Controller.
Open Heater – If a heater opens, the RMT Controller will recognize this as a large change in resistance and the Safety Shutdown Relay will open.
Open Thermocouple – If a thermocouple circuit opens, the RMT Controller will recognize this as a large change in resistance and the Safety Shutdown Relay will open.
Compromised signal to the safety relay coil (within the RMT Controller) – If the heater enters into a thermal run-away condition and the secondary system (safety loop) does not result in an “Off” condition of the output, the safety algorithm will shut off the primary output device.
Welded contacts on safety relay (within the RMT Controller) – If the heater enters into a thermal run-away condition and the secondary system (safety loop) does not result in an “Off” condition of the output, the safety algorithm will shut off the primary output device.
Over voltage of supply to heater – The RMT Controller has voltage input specifications (refer to Specifications section of this User’s Manual) Voltage applied to the control that exceed the specified values will result in damaged hardware and the controller  must be replaced.
User enters incorrect temperature limit – The RMT Controller has multiple user settable parameters, the user must make sure limits (temperature, voltage and resistance). If the temperature limit is set beyond the heater design, over temperature conditions may occur.
User enters incorrect resistance limit – The RMT Controller has multiple user settable parameters. The user must make sure limits (temperature, voltage and resistance). If the Resistance limit is set incorrectly compared to the heater design, over  temperature conditions may occur.
Calibration is incorrect – Every RMT Controller has been calibrated by a NIST traceable calibration system and process. Calibration values are stored in non-volatile memory and will not be interrupted under normal and specified operation. Should an event occur that causes corruption to the calibration data within the RMT Controller, the process temperature may migrate to a thermal runaway condition. Thermal process should be audited from time to time to insure proper operation associated with temperature  control

Wiring and Set Up

Wiring
Apply 24-28 Vac/dc to terminals 98 (V+) and 99 (V-) of the ‘C’ Connector.
RMT Load Power 200-240 Vac 10% Mating Connector – Use 171692-0102 connector, Molex 76823-0321 14 AWG pins.

Connect heater connectors to mating connectors of the RMT Module using Heater connector Molex 43025(1200 or 1208), with molex 43030 series pins.
Connect the Safety Relay Output to system contactor that is responsible for interrupting power to the entire system or whatever mechanism is deemed as a safe environment. This will eliminate the opportunity for current flow that may result in risk of electrical  hazard such as shock or fire. Mating connector – Use Molex 172256-1002, with Molex 172253 family of pins with Molex 1722643002 strain relief.

Power and Communications

Slot C| Terminal Function| Configuration
98
99| Power input: ac or dc+
Power input: ac or dc-| All
CF
CD
CE| Standard Bus EIA-485 common
Standard Bus EIA-485 T-/R-
Standard Bus EIA-485 T+/R+| Standard Bus
Part # Digit 13
RMCxxxxxxxxx(A)xx
CC
CA
CB| Standard Bus or Modbus RTU EIA-485 common
Standard Bus or Modbus RTU EIA-485 T-/R-
Standard Bus or Modbus RTU EIA-485 T+/R+| Standard Bus or Modbus
Part # Digit 13
RMCxxxxxxxxx(1)xx
CZ
CX
CY| Inter-module Bus
Inter-module Bus
Inter-module Bus| Inter-module Bus

LED
There is a bi-colored LED on the front of the RMT controller. A full “On” green LED is normal operating condition.
Blinking green for code update and a solid red LED indicates a safety condition.
RMT Safety Limit
This feature is available on every RMT PCBA. The safety limit output is a mechanical relay. The relay ratings are as follows:
• 2 Amps resistive 24 – 240 VAC or 30 VDC
• 125 VA Pilot Duty 120/240 VAC, 25 VAC at 24 VAC.
The Safety Relay is intended to be wired in series with the coil of a system level contactor that will interrupt the thermal system in a safe way.
An error code is available via communications, user intervention is required to clear the alarm status as it is a latching alarm.

Product Compatibility

• EZ-ZONE RMA PLUS
• EZ-ZONE RM (C, E, H, L, S) version 9.0+
• EZ-ZONE PM version 15.0+
• RM (F, G, UH, Z)
• POWER GLIDE

Software Compatibility

Firmware Updates
RMT firmware can be updated by connecting to another RM device with Ethernet or USB connection and using either Watbus Flash Loader Utility or Dashboard to push an updated to the RMT over high-speed Watbus.
Once the program has completed sending the update to the RMT, the RMT must be power cycled for the update to complete.
Control Modes
Off – No output activity= sensing circuit is working. Does not evaluate faults.
Auto – Normal operating condition= PID control, sensing circuit is active and faults will be initiated if present.
Manual – Operates in percent power mode; sensing circuit is active and faults will be initiated if present.
Output De-Rating data (output current vs . ambient temperature)

Faults and Troubleshooting

Indications and Faults
A green LED (full “ON”) indicates the controller is operating normally.
A red LED (full “ON”) indicates a detectable unsafe fault has occurred.
A flashing green LED will occur when updating firmware.
Manual intervention is required to reset the fault condition.
(Discovery of the fault, clearing the fault by power cycle or sending a “clear fault” signal via comms)
A deviation alarm should be set for each channel/output.
This is accomplished by entering the value of which the temperature has become too cold or too hot for the process.

Troubleshooting

Heater is not heating up| •   Check RMT fault codes from the RMT Controller.
•   Check wiring to heater
---|---
RMT fan has stopped working| Each RMT Controller has a fan mounted to the bottom side of the enclo- sure. The fan is not field repairable. If fan problems occur contact the Watlow Service Department
NOTE: Should the fan stop operating, the output devices will self-manage their thermal properties to keep them from self-destructing. Increased ambient conditions will increase without the fan operating and the RMT Controller may not operate at full output capacity.

Specifications

Voltage| Input voltage range is 85 to 265VAC 208 Vac +/- 10% or
240 Vac ±10% voltage range. Refer to the Power
Derating Curve on the previous page.
---|---
Heater Outputs| Heater outputs: Maximum 0.75A on any one output, multiple outputs follow derating curve on page 13.
RMT module Ambient Rating| -18 to 65 degrees C. (Refer to de-rating chart)
Humidity| 0 – 90% non-condensing
Altitude| Maximum 2,000 meters.
Safety Relay| 2 Amps resistive 24 – 240 VAC or 30 VDC. 125 VAC Pilot Duty 120/240 VAC, 25 VAC at 24 VAC.
Safety Limit Output| Mechanical relay, open on fault. Output Relay COM. and N.O. terminals. Energized in safe conditions, open on fault.
Installation category| Installation category II, pollution degree category 2.No maintenance requirements or field serviceable parts apply to the RMT Controller.
Agency Directives| ISO 13849-1 Safety of Machinery – Safety-related parts of control systems – Part 1: General principles for design (Category 2 and performance level C) Third Edition, dated December 15, 2015
Standard for Safety| Electrical Equipment for measurement, control and laboratory use; Part 1: General requirements Third Edition, Dated May 11, 2012
Fan Specifications| •   Operating Temperature: -20°C N +65°C
•   Storage Temperature: -20°C N + 75°C
•   Life Expectancy: 65,000 Hours (Ll0 at 45°C)
•   Available Options Tachometer Output Alarm Output IP Ratings
•   Weight: 0.07 lbs

Appendix

Agency Directives:
ISO 13849-1 SAFETY OF MACHINERY — Safety related parts of control systems — Part 1: General principles for design (Category 2 and performance level C).
Third edition 2015-12-15
UL 61010-1 STANDARD FOR SAFETY ELECTRICAL EQUIPMENT – For Measurement, Control, and Laboratory Use;
Part 1: General Requirements.
Third Edition, May 11, 2012
Including revision dated November 21, 2018

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Alarms
Alarms are activated when the output level, process value or temperature leaves a defined range. A user can configure how and when an alarm is triggered, what action it takes and whether it turns off automatically when the alarm condition is over. Configure  alarm outputs in the Setup Page before setting alarm set points. Alarms do not have to be assigned to an output. Alarms can be monitored and controlled through the front panel or by using software.

Process and Deviation Alarms
A process alarm uses one or two absolute set points to define an alarm condition.
A deviation alarm uses one or two set points that are defined relative to the control set point. High and low alarm set points are calculated by adding or subtracting offset values from the control set point. If the set point changes, the window defined by the alarm  set points automatically moves with it. Select the Type a.ty via the Setup Page, Alarm Menu.
Alarm Set Points
The high set point defines the process value or temperature that will trigger a high side alarm. The low set point defines the temperature that will trigger a low side alarm. For de-viation alarms, a negative set point represents a value below closed loop set point. A posi-tive set point represents a value above closed loop set point. View or change alarm set points with Alarm Low a.Lo and High Set Points a.hi (Operations Page, Alarm Menu).
Hysteresis
An alarm state is triggered when the process value reaches the alarm high or low set point. Hysteresis defines how far the process must return into the normal operating range before the alarm can be cleared. Hysteresis is a zone inside each alarm set point. This  zone is defined by adding the hysteresis value to the low set point or subtracting the hysteresis value from the high set point.
View or change Hysteresis a.hy via the Setup Page, Alarm Menu.
NOTE TO DAVE: See RMC Manual for diagram PAge 246
Latching
A latched alarm will remain active after the alarm condition has passed. It can only be deacti-vated by the user and only when the alarm condition no longer exists.
If using an RUI an active message, such as an alarm message, will cause the display to toggle between the normal settings and the active message in the upper display and attn in the lower display.

To clear a latched alarm:

1. Push the Advance Key ‰ to display ignr in the upper display and the message source in the lower display.
2. Use the Up ¿ or Down ¯ keys to scroll through possible responses, such as Clear CLr or Silence SiL.
3. Push the Advance ‰ or Infinity ˆ key to execute the action.

Without an RUI, a latched alarm can be reset by cycling power to the module or configuring an Action function within the control to perform a reset. Do this by setting the Action Func-tion to alarm and trigger the Action to occur through Source Function  A. An alarm that is not latched (self-clearing) will deactivate automatically when the alarm condition has passed. Turn Latching a.La on or off via the Setup Page, Alarm Menu.

Silencing
If silencing is on the operator can disable the alarm output while the controller is in an alarm state. The process value or temperature has to enter the normal operating range beyond the hysteresis zone to activate the alarm output function again.
If using an RUI an active message, such as an alarm message, will cause the display to toggle between the normal settings and the active message in the upper display and attn in the lower display.
To silence an alarm:

1. Push the Advance Key ‰ to display ignr in the upper display and the message source in the lower display.
2. Use the Up ¿ and Down ¯ keys to scroll through possible responses, such as Clear CLr or Silence siL.
3. Push the Advance ‰ or Infinity ˆ key to execute the action.

Without an RUI, silencing aa alarm can be accomplished by configuring an Action function within the control to silence the alarm. Do this by setting the Action Function to Silence and trigger the Action to occur through Source Function A. Turn Silencing a.si on or off via the Setup Page, Alarm Menu.
Blocking
Blocking allows a system to warm up after it has been started up. With blocking on, an alarm is not triggered when the process temperature is initially lower than the low set point or high-er than the high set point. The process temperature has to enter the  normal operating range beyond the hysteresis zone to activate the alarm function.
If the RMC module has an output that is functioning as a deviation alarm, the alarm is blocked when the set point is changed, until the process value re- enters the normal operating range. Turn Blocking a.bL on or off via the Setup Page, Alarm Menu.
Note: If using current as the alarm source, see the application note below under “Current Sens-ing”.

Resetting a Tripped Limit

When a limit controller is ordered (RMC[5,6] [5,6] [5,6] [5,6] ) output 2 (digit 4), output 4 (digit 6), output 6 (digit 8) or output 8 (digit 10) will always be a Form A (nor-mally open) Mechanical Relay and it will always be internally tied to the  limit function. When the limit is in a safe state the internal coil for this relay will be energized, therefore the relay will be closed. When a condition occurs that causes the limit to trip, the internal coil will de-energize causing the relay to latch open. When the condition that caused the limit to trip has been resolved, the relay will remain latched open until reset. The process to reset a latched limit can be different from control to control and is dependent upon the controller firmware version.

To check the firmware revision of your control do one of the following:
If using an RUI:

1. Navigate to the RMC Factory Page by simultaneously pushing and holding the Advance Key and the Infinity ˆ for approximately 8 seconds and then use the up or down arrow key to navigate to the Diagnostic Menu. Once there, push the Advance Key twice  where the revision rEv will be shown in the lower display and the upper display will indicate the cur-rent firmware revision.

If using EZ-ZONE Configurator software:

1. Make the connection to the RMC module.
2. Once the connection is made on the left hand side of the screen under “Parameter Menus” click the plus sign next to the Factory page.
3. Double-click the Diagnostics menu to see the RMC firmware revision.

To reset a tripped limit prior to firmware release 6 .0 follow the steps below:

1. Push the Advance Key ‰ and then push the Up ¿ or Down ¯ keys and select Clear CLr.
2. Configure an Action Function to Limit Reset assigning the Source Function to a digital input (navigate to the Setup Page under the Action Menu).
3. Use a field bus protocol, i.e., Modbus, EtherNet/IP, etc…where a value of zero would be written to the associated address (to find the appropriate address, navigate to the Opera-tions Page and then the Limit Menu. Under the Limit Menu look for Clear Limit).
4. Cycle the power to the controller.

To reset a tripped limit with firmware release 6 .0 and above follow the steps below:

1. Push the Advance Key ‰ and then push the Up ¿ or Down ¯ keys and select Clear CLr.

2. Follow the steps below:
   2a. Navigate to the Setup Page and then the Limit Menu
   2b. Set Source Function A to the desired device that will reset the limit (Digital I/O, Vari able or Function Key)
   2c. Define the Source Instance and Zone

3. Use a field bus protocol, i.e., Modbus, EtherNet/IP, where a value of zero would be written to the associated address (navigate to the Operations Page and look for Clear Limit under the Limit Menu to find appropriate address).

4.  Cycle the power to the controller.

Temperature Input class 57 went into F4T manual -page 200 Temperature Input section Andrews Notes below

• Class handles all temperature input related information and settings
• Member 1 is the raw process value
• Error status member 2 is not expected to be directly used by the user for viewing errors
• Filter time member 3 allows the filter process value to be manipulated, displaying the temperature from the previous listed seconds of the process value, allowing the filtered process value to display more smooth and controlled
• Output member 4 deals with filtered process value, which is used by the control loop
• Input type member 5 will always be thermocouple
• Thermocouple Type member 6 is locked here in RMT and can only be modified by factory
• User Offset member 16 can give the user the option to offset displayed temperature to they want the temperature to display in the filtered process value
• One main use case is that the position of the sense junction for the RMT is not right on the pipe, so if we know the difference in temperature between the junction and the pipe, the user can modify the offset to match the pipe more closely for a more real world temperature
• Safety is unaffected by the offset value
• Temperature Input class 57 went into F4T manual -page 200 Temperature Input section
• Class handles all temperature input related information and settings
• member 1 is the raw process value
• Error status member 2 is not expected to be directly used by the user for viewing errors
• Filter time member 3 allows the filter process value to be manipulated, displaying the temperature from the previous listed seconds of the process value, allowing the filtered process value to display more smooth and controlled output
• member 4 deals with filtered process value, which is used by the control loop
• Input type member 5 will always be thermocouple
• Thermocouple Type member 6 is locked here in RMT and can only be modified by factory
• User Offset member 16 can give the user the option to offset displayed temperature to they want the temperature to display in the filtered process value
• one main use case is that the position of the sense junction for the RMT is not right on the pipe, so if we know the difference in temperature between the junction and the pipe, the user can modify the offset to match the pipe more closely for a more real world temperature
• Safety is unaffected by the offset value

Temperature Input
Configure and use this input to condition a temperature measurement made with a thermocouple or RTD. The Temperature Input block scales the signal to an absolute temperature with no other configuration required.
Resistance Temperature Device (RTD) 100 and 1000 Ohm
Use this block to condition a temperature measurement made with an RTD. This FB is found on the canvas of the FB diagram. The number of these FBs that are available depends on the number of installed flex modules with temperature inputs.
The module number shown on the block is the number of the controller’s slot that houses the flex module with
the temperature input. The Temperature In number indicates the specific input on the flex module.

Signals

applied

Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Sensor Type
Select the device used to measure temperature.
Options: RTD 100 Ohm, RTD 1000 Ohm
Display Precision
Set how many decimal places are displayed for the process value and associated parameters such as set points.
Options: Whole, Tenths, Hundredths, Thousandths

Calibration Offset
Set a value to add to the measured input value to compensate for sensor placement, lead wire resistance or other factors that cause the input to vary from the actual process value
Range: -99,999.000 to 99,999.000°F or units -55,555.000 to 55,555.000°C
Filter
Set the amount of filtering to apply to the input. Filtering smooths signal fluctuations. Increase the time to increase filtering. Excessive filtering slows the input’s response.
Range: 0.0 to 60.0 second

Input Error Latching

Set whether an input error persists until it is cleared or clears automatically when the sensor signal returns to a normal level.
Options:

• Off: error clears automatically once the input returns to normal
• On: error remains active until the input returns to normal and the error is cleared by the Clear Error parameter

Clear Error
Set this parameter to Clear to reset the input error after correcting the condition that caused it.
Options: Ignore, Clear
Thermocouple
Use this block to condition a temperature measurement made with a thermocouple. This FB is found on the canvas of the FB diagram. The number of these FBs that are available depends on the number of installed flex modules with temperature inputs.
The module number shown on the block is the number of the controller’s slot that houses the flex module with the temperature input. The Temperature In number indicates the specific input on the flex module.

Signals

offset as a connection to another FB.

Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Sensor Type
Select the device used to measure temperature.
Options: Thermocouple

• TC Linearization
• Select the Thermocouple type.
• Range: B, K, C, N, D, R, E, S, F, T, J

Display Precision
Set how many decimal places are displayed for the process value and associated parameters such as set points.
Options: Whole, Tenths, Hundredths, Thousandths
Calibration Offset
Set a value to add to the measured input value to compensate for sensor placement, lead wire resistance or other factors that cause the input to vary from the actual process value
Range: -99,999.000 to 99,999.000°F or units -55,555.000 to 55,555.000°C

Filter
Set the amount of filtering to apply to the input. Filtering smooths signal fluctuations. Increase the time to increase filtering.
Excessive filtering slows the input’s response. Range: 0.0 to 60.0 second
Input Error Latching
Set whether an input error persists until it is cleared or clears automatically when the sensor signal returns to a normal level.
Options:

• Off: error clears automatically once the input returns to normal
• On: error remains active until the input returns to normal and the error is cleared by the Clear Latch parameter

Clear Error
Set this parameter to Clear to reset the input error after correcting the condition that caused it.
Options:Ignore, Clear

Temperature Input Errors

operating range.
RTD Error| An RTD sensor error has occurred.
Fail| A measurement failure has occurred.
Not Sourced| An input signal is not connected to a function block’s output.
Stale Data| Data sourced from another controller has become unavailable.
Math Error| A calculation has no defined result (such as divide by zero).

http://www.watlow.com/

References

• Terms and Conditions of Sale | Watlow
• Global Supplier of Industrial Electric Thermal Solutions | Watlow
• Global Supplier of Industrial Electric Thermal Solutions | Watlow
• Solutions for the Complete Thermal Loop | Watlow
• Global Supplier of Industrial Electric Thermal Solutions | Watlow
• Terms and Conditions of Sale | Watlow

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