EPS 2011-04

6-9

Troubleshooting

Diagnostic Tests

Testing the Unit by Resetting It

If you believe the external power supply is not operating correctly, you can

reset the unit to test its circuitry and operating code. To reset a unit, unplug

and plug in the power cord (power-cycling).

Note For HP 610 EPS units, the backup power cables must be disconnected first.

Use caution when power cycling the unit as this may affect devices receiving

operating power from the unit.

Power-cycling the RPS/EPS power supplies causes the units to perform their

power-on self test, which normally resolves any temporary operational prob-

lems.

Checking the Unit’s LEDs

The self test passes if the Fault LED on the front of the RPS/EPS power supply

goes off after approximately 5 seconds. If this LED stays on longer than 15

seconds or begins blinking, there may be a problem with the unit.

For information on interpreting the LED patterns, see Diagnosing with the

LEDs on page 6-3 for the HP 600 RPS/EPS and the HP 610 EPS, and for the HP

620 RPS/EPS and the HP 630 RPS/EPS see Diagnosing with the LEDs on page

6-7.

➑

The connection

is not working

properly.

Try the following procedures:

• For the indicated port, verify that both ends of the cabling, at the unit and the connected

device, are connected properly.

• Verify the connected device and unit are both powered on and operating correctly.

• If the other procedures don’t resolve the problem, try using a different port or a different

cable.

➒

EPS power is not

available.

Check the log file of the connected switch for more detailed information. Try

disconnecting, then reconnecting the EPS cable. Wait three to four seconds for the device

to successfully communicate for EPS power. Also try another EPS cable. If this fails to

restore EPS power, call your HP-authorized LAN dealer, or use the electronic support

services from HP to get assistance.

Tip Problem Solution