What to do if Watlow CLS200 Controller display is not lit?
If your Watlow Controller display is not lit, the power connection might be incorrect. Check the wiring and service. Alternatively, there may be no EPROM or a bad EPROM, in which case you should replace the EPROM. It is also possible that the CLS200 is damaged or has failed, requiring you to return it for repair.
How to fix Watlow CLS200 Controller that does not behave as expected?
If your Watlow Controller is not behaving as expected, it might be due to corrupt or incorrect values in RAM. Try performing a NO-key reset.
Why are all loops set to manual 0% on my Watlow CLS200?
If all loops on your Watlow Controller are set to manual 0%, it may be due to intermittent power. Check the wiring and service the unit. Consider using a separate DC supply for the controller and provide backup power (UPS). You can also set the POWER UP OUTPUT STATUS to MEMORY. Another cause could be an overloaded analog reference voltage; try disconnecting the wiring from the +5V Ref connection on TB1. Finally, a hardware failure may be the cause, so check the controller front panel for a hardware alarm.
What to do if control status changes from automatic to manual on Watlow CLS200?
If the control status of one or more loops changes from automatic to manual on your Watlow Controller, check the display or software for a failed sensor message. Also, if the digital job select feature is enabled and has changed jobs, set JOB SELECT DIG INPUTS to NONE using the controller’s keypad and display.
Why the keys do not work on lit Watlow CLS200 Controller display?
If your Watlow CLS200 Controller display is lit but the keys do not work, the keypad may be locked. If that's not the case, the CLS200 might be damaged or have failed, requiring you to return it for repair.
What happens when my Watlow CLS200 shows a process or deviation alarm?
When a Watlow Controller experiences a process or deviation alarm, the controller switches to the single loop display for the loop with the alarm and displays the alarm code on the screen.
How to clear failed sensor alarm on Watlow Controller?
A failed sensor alarm on the Watlow Controller clears once it has been acknowledged and the sensor is repaired.
General| Model | CLS200 |
|---|---|
| Type | Temperature Controller |
| Output Types | Relay, SSR, Analog |
| Control Modes | On/Off, PID, Manual |
| Mounting | Panel Mount |
| Input Types | Thermocouple, RTD |
| Alarms | High, Low |
| Communication | RS-485, Modbus |
| Display | LED |
| Power Supply | 100-240 VAC |
Details the symbols used throughout the manual to indicate important information, cautions, and warnings.
Highlights key features of the CLS200 series controllers, including loop capabilities and connectivity.
Emphasizes the need for independent, external safety devices to prevent potential controller failures.
Explains the controller's behavior during power loss and restart.
Provides guidance on selecting a location and mounting the controller and associated components.
Details the procedure for mounting the controller into a panel, including clearance requirements.
Explains the two methods for mounting the TB50 terminal board: DIN rail or standoffs.
Covers essential aspects of system wiring, including recommendations for grounding and noise suppression.
Provides guidelines for selecting wires and cables for various connections.
Offers tips on recognizing and avoiding problems caused by electromagnetic interference (EMI).
Details how to make the power connections to the CLS200 and connect the TB50.
Provides procedures to test the controller and its connections after installation.
Describes how to properly connect various sensor types, including thermocouples, RTDs, and voltage inputs.
Details the specific connections for thermocouple inputs.
Explains how to connect voltage input signals, including the need for scaling resistors.
Describes how to connect current input signals, noting the requirement for scaling resistors.
Covers how to connect pulse input signals, such as from encoders.
Explains how to wire and configure the control outputs for the CLS200 series controller.
Describes typical connections for control and alarm outputs using solid-state relays (SSRs).
Provides a detailed terminal map for the TB18 connection block.
Provides instructions on how to perform autotuning to automatically set PID parameters.
Enables scaling of raw input readings to engineering units for linear or pulse inputs.
Facilitates testing of digital inputs, digital outputs, and keypad buttons.
Explains how to start a profile, run multiple profiles simultaneously, and edit running profiles.
Explains the algorithms dictating controller response to input signals.
Describes the simplest control method, turning output on or off based on setpoint deviation.
Explains increasing/decreasing output proportionally to process variable deviation from setpoint.
Corrects for offset by repeating proportional band's error correction until no error.
Corrects for overshoot by anticipating process variable behavior.
Discusses the use of one or two outputs for controlling heating and cooling.
Calculates output between 0-100% by turning output on for a percentage of a fixed cycle time.
Distributes output on/off state per AC line cycle, reducing electrical noise.
Digitally smooths PID control output signals to reduce erratic swings.
Defines how output changes relative to process variable changes (heating/cooling).
Provides guidance on tuning control loops and setting PID parameters.
Shows proportional band settings for various temperatures.
Explains how to set the derivative parameter (TD) in seconds.
Provides suggested PID values for various applications.
Lists common symptoms of controller problems and suggests causes and actions.
Describes process and deviation alarms, their codes, and potential causes.
Explains how to reset alarms based on the alarm type setting.
Details alarm codes and descriptions for failed sensor conditions.
Lists hardware error messages and their possible causes and recommended actions.
Details procedures for diagnosing and correcting controller problems.
Troubleshooting steps for when the controller displays LOW POWER or the display is not lit.
Addresses the dead battery alarm and its implications for controller settings.
Troubleshooting guide for ambient temperature alarms (too hot or too cold).
Troubleshooting for hardware gain or offset failure alarms.
Troubleshooting steps for when front panel keys do not respond, possibly due to keypad lock.
Procedures for checking the functionality of control outputs.
Covers troubleshooting for controllers, computers, and communication links in supervised systems.
Addresses common communications problems related to wiring and parameter settings.
Explains how ground loops can affect communications and how to eliminate them.
Details how to perform a NO-key reset to return controller settings to defaults.
Provides instructions for replacing the EPROM, involving minor mechanical disassembly.
Details specifications for the controller's digital input capabilities.
Specifies parameters for digital outputs, including operation, function, and types.
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