Chapter 4 Troubleshooting the Installation
Troubleshooting a DC Power Subsystem
The following conditions must exists for a DC PEM to operate normally:
•The PEM is fully seated in its bay and the ejector levers are secured.
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•The circuit breaker on the PEM is switched on.
•The green LEDs labeled OUTPUT OK and INPUT OK on the PEM are on, and the amber LED labeled MISWIRE is off.
Follow these steps to help isolate a problem with a DC PEM:
Step 1 Is the MISWIRE LED on?
•If yes, the source DC positive and negative cable leads are connected in reverse order to the terminal connector block on the PDU. Power off the PEM circuit breaker switch and reconnect the cable leads correctly.
•If no, go to Step 2.
Step 2 If the INPUT OK LED is off, verify that the PEM is fully seated in its bay, the ejector levers are flush with the PEM faceplate, and the captive screws are secured.
•If the INPUT OK LED goes on, go to Step 6.
•If the INPUT OK LED remains off, go to Step 3.
Step 3 Verify that the PEM circuit breaker switch is on.
•If yes, go to Step 4.
•If no, switch the circuit breaker on.
–If the INPUT OK LED remains off, go to Step 4.
–If the INPUT OK LED goes on, go to Step 6.
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