Liebert TM-10098 service manual iCOM Control Training and Service Manual

iCOM Control Training and Service Manual

2.If the programming is correct and the output opto-isolator is functioning properly but the load device is not activated the next step is to check the triac and hard wiring to the load device. Verify that 24 VAC is being applied to Pin 1 of the triac, place the VOM leads between Pin 1 and the proper transformer ground connection. If 24 VAC is not present at Pin 1 of the triac backtrack the circuit to the proper secondary hot of the control transformer.

If 24 VAC is present perform the following:

Select the appropriate diagnostics function from the control menu; use the training and service manual for reference. During the TEST OUTPUTS function the green LED on the microprocessor should light. If the LED lights check the hardware from the plug to the load device. If the LED does not light run the TEST CONTROL BOARD diagnostics function. If board failure is displayed contact your local sales office.

Note: Triacs are current limiting devices; therefore the load device must be connected to obtain valid voltage readings when doing VOM checks and circuit troubleshooting. Repair or replace any missing or defective components in the circuit.

Mechanical Problems: If the failure of the load device to activate is determined to be mechanical in nature consult the appropriate Liebert system operation and maintenance, reference the individual component manufacturers literature or contact your local Liebert representative.

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