CLS200 Series User’s Guide
Chapter 8: Troubleshooting and Reconfiguring
145
support to determine the correct wiring.
4. If the ambient temperature is within range and the error persists:
a. Turn the power to the controller off.
b. Remove the boards from the CLS200 housing.
c. Reseat the boards and turn power on.
5. If the error persists, make a record of the settings, then perform a NO-key reset. See NO-Key
Reset on page 150.
6. If the error is not cleared, contact your supplier for further troubleshooting guidelines. See
Return Material Authorization (RMA) on page 3.
NOTE! If the controller has failed, it is likely that it was damaged by excessive voltage or
noise. Before replacing the controller, troubleshoot for noise and ground loops.
H/W Gain or Offset Failure
If the controller displays H/W GAIN FAILURE or H/W OFFSET FAILURE:
1. Acknowledge the alarm.
2. If the error message remains, turn the power to the controller off, then on again.
3. If the H/W Gain error is reported, remove any connections to the 5VDC reference (TB1-18) on
the back of the controller. If this corrects the problem, there was an error in the wiring. You may
need to consult technical support to determine the correct wiring.
4. If the error persists, make a record of the settings, then perform a NO-key reset. See NO-Key
Reset on page 150.
5. If the error is not cleared, contact your supplier for further troubleshooting guidelines. See
Return Material Authorization (RMA) on page 3.
NOTE! If the controller has failed, it is likely that it was damaged by excessive voltage or
noise. Before replacing the controller, troubleshoot for noise and ground loops.
Keys Do Not Respond
If the CLS200 seems to function but the MAN/AUTO, CHNG SP, ALARM ACK, and RAMP/SOAK
keys do not respond when you press them, the keypad is probably locked. Unlock the keypad
according to the instructions in Keyboard Lock Status on page 71.
Checking Analog Inputs
If the process variable displayed on the controller is not as expected:
1. If the values displayed in software and on the controller do not agree, verify that the controller
is communicating.
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