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Maria MurphySep 1, 2025
What to do if the limit won’t clear or reset on Watlow Controller?
- Hheidi69Sep 1, 2025
If the limit on your Watlow Controller won’t clear or reset, correct the cause of the sensor input being out of the limit range.
To Next PageTo Next PageWhat to do if the limit won’t clear or reset on Watlow Controller?
If the limit on your Watlow Controller won’t clear or reset, correct the cause of the sensor input being out of the limit range.
What to do if Watlow ez-zone pm displays Device Error 100 rEtn?
If your Watlow Controller displays Device Error 100 rEtn, replace or repair the controller.
What does Ambient Error Er.ab mean on Watlow ez-zone pm?
If you encounter an Ambient Error Er.ab on your Watlow Controller, it indicates that the ambient error - cold junction circuitry is not working. Return it to the factory for repair.
Why does my Watlow ez-zone pm have no display?
If your Watlow Controller's display is blank, several factors could be the cause: * The controller might not be receiving power, so ensure it is turned on. * A fuse may have blown, requiring replacement. * The breaker could be tripped, needing a reset. * The safety interlock switch might be open, requiring closure. * A separate system limit control could be activated, requiring a reset. * There may be a wiring issue that needs correction. * The controller might be receiving incorrect voltage, so verify and apply the correct voltage, checking the part number to confirm.
Why is my Watlow Controller temperature running away?
A temperature runaway in your Watlow Controller can stem from several issues: * The controller output may be incorrectly programmed; verify that the output function is correct (heat or cool). * The thermocouple might be reverse wired; correct the sensor wiring, ensuring the red wire is negative. * The controller output might be wired incorrectly; verify and correct the wiring. * There could be a short in the heater; replace the heater. * The power controller connection to the controller may be defective; replace or repair the power controller. * The controller output might be defective; replace or repair the controller.
What causes Watlow ez-zone pm process doesn’t control to set point?
If the process isn't controlling to the set point on your Watlow Controller, it could be due to: * The controller not being tuned correctly. Perform autotune or manually tune the system. * The control mode being set incorrectly. Set the control mode appropriately (Open vs Closed Loop). * The control set point being incorrect. Set the control set point in the appropriate control mode and check the source of the set point: remote, idle, profile, closed loop, open loop.
What does Error Input Er.i1 Er.i2 mean on Watlow ez-zone pm?
If your Watlow Controller displays an 'Error Input Er.i1 Er.i2' message, it could indicate: * The sensor is improperly wired or open. Correct the wiring or replace the sensor. * The sensor type setting is incorrect. Match the setting to the sensor used. * The calibration is corrupt. Check the calibration of the controller.
Why is my Watlow Controller alarm not occurring?
If the alarm on your Watlow Controller isn't occurring when expected, here are some potential reasons: * Silencing might be active; disable it if required. * Blocking might be active; disable it if required. * The alarm might be set to an incorrect output; set the output to the correct alarm source instance. * The alarm might be set to an incorrect source; set the alarm source to the correct input instance. * The alarm set point might be incorrect; set the alarm set point to the correct trip point. * The alarm might be set to an incorrect type; set the alarm to the correct type: process, deviation, or power.
What does Alarm High AL.h1 AL.h2 AL.h3 AL.h4 mean on Watlow Controller?
If your Watlow Controller displays an 'Alarm High AL.h1 AL.h2 AL.h3 AL.h4' error, it could mean: * The temperature is greater than the alarm set point; check the cause of the over temperature. * The alarm is set to latching and an alarm occurred in the past; clear the latched alarm. * The alarm set point is incorrect; establish the correct alarm set point. * The alarm source is incorrect; set the alarm source to the proper setting.
What does Limit Error Li.E1 mean on Watlow ez-zone pm Controller?
If your Watlow Controller displays a 'Limit Error Li.E1' message, it could be due to: * The sensor being improperly wired or open. Correct the wiring or replace the sensor. * The sensor type setting being incorrect. Match the setting to the sensor used. * The calibration being corrupt. Check the calibration of the controller.
General| Model | EZ-ZONE PM |
|---|---|
| Input Types | Thermocouple, RTD, Process Voltage, Process Current |
| Output Types | Relay, SSR drive, voltage (0-10V), current (0-20mA, 4-20mA) |
| Display | LED |
| Power Supply | 100-240V AC |
| Communication Protocols | Modbus RTU, Ethernet/IP, DeviceNet |
| Agency Approvals | CE |
| Configuration | Front panel, PC software |
| Operating Temperature | 0°C to 55°C (32°F to 131°F) |
| Alarms | 4 configurable alarms with relay or logic outputs |
Explains safety symbols, notes, cautions, and warnings for safe operation.
Describes the controller's purpose, advanced PID, configuration software, and key benefits.
Provides physical dimensions and recommended panel spacing for various models.
Step-by-step instructions for mounting and connecting the controller.
Details wiring for Modbus, DeviceNet, EtherNet/IP, J1939, Profibus, and EIA-485.
Instructions for connecting the controller to a PC for configuration and monitoring.
Covers password protection, read/write lockout levels, and enabling security features.
Explains PID parameter tuning, autotune, manual tuning, and TRU-TUNE+ adaptive control.
Provides guidance on identifying and resolving common alarms, errors, and control issues.
Lists electrical, environmental, accuracy, agency approvals, and controller specifications.
