How to troubleshoot Watlow Controller temperature runway?
To troubleshoot a temperature runway with your Watlow Controller, verify that the output function is correctly set for heating or cooling. Check and correct the sensor wiring, ensuring the red wire is not negative. Inspect and correct any other wiring issues. If problems persist, consider replacing the heater, power controller, or the controller itself.
How to fix no display on Watlow PM LEGACY PM3 Controller?
If there is no display on your Watlow Controller, several factors could be the cause. First, ensure that the controller is receiving power by turning on the power supply. Check the fuse and replace it if it's open. Reset the breaker if it has tripped. Confirm that the safety interlock switch is closed and reset the limit if a separate system limit control has been activated. Also, inspect the wiring for any issues, apply the correct voltage, and verify the part number.
Why won’t alarm clear or reset on my Watlow PM LEGACY PM3?
If the alarm on your Watlow Controller won’t clear or reset, try the following: reset the alarm when the process is within the correct range, or disable latching. Ensure the output is set to the correct alarm source instance, and the alarm source is set to the correct input instance. Also, correct any issues causing the sensor input to be out of the alarm range. Finally, verify the alarm set point and type are correctly configured.
How do I fix no serial communication with my Watlow Controller?
To resolve serial communication issues with your Watlow Controller, start by setting unique addresses on the network. Ensure that the protocol, baud rate, and parity match between all devices. Correct any wiring issues and verify or replace the converter if necessary. Also, set the correct communication port and ensure the software setup matches the controller's configuration. Route communication wires away from power wires and place a 120 ? resistor across EIA-485 on the last controller.
What to do if Watlow PM LEGACY PM3 Controller shows Alarm High AL.h1 AL.h2 AL.h3 AL.h4?
If your Watlow Controller displays Alarm High (AL.h1, AL.h2, AL.h3, AL.h4), you should check the cause of the over temperature. Clear any latched alarms, establish the correct alarm set point, and ensure the alarm source is properly set.
What to do if Watlow PM LEGACY PM3 shows Alarm Low AL.L1 AL.L2 AL.L3 AL.L4?
If your Watlow Controller displays Alarm Low (AL.L1, AL.L2, AL.L3, AL.L4), you should check the cause of the under temperature. Clear any latched alarms, establish the correct alarm set point, and ensure the alarm source is properly set.
What does Alarm Error AL.E1 AL.E2 AL.E3 AL.E4 mean on Watlow PM LEGACY PM3 Controller and how to fix it?
If your Watlow Controller is showing an Alarm Error (AL.E1, AL.E2, AL.E3, AL.E4), it could be due to a sensor being improperly wired or open. Correct the wiring or replace the sensor. Also, ensure the setting matches the sensor being used and check the calibration of the controller.
What does Limit High Li.h1 mean on Watlow Controller and how to clear it?
When a Watlow Controller displays Limit High (Li.h1), you should check the cause of the over temperature. Clear the limit and establish the correct limit set point.
What does Limit Low Li.L1 mean on Watlow PM LEGACY PM3 Controller and how to clear it?
When your Watlow Controller displays Limit Low (Li.L1), check the cause of the under temperature. Clear the limit and establish the correct limit set point.
Why won’t limit clear or reset on my Watlow PM LEGACY PM3 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. Set the limit set point to the correct trip point and configure the digital input function and source instance.
General| Control Mode | On/Off, PID |
|---|---|
| Controller Type | PID |
| Input Type | Thermocouple, RTD |
| Output Type | Relay, Solid State Relay, Analog |
| Communication | RS-485 |
| Power Supply | 100-240 VAC |
| Control Algorithm | PID |
| Enclosure Rating | IP65 |
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