HP Parallel Uninterruptible Power System - Manual (Page 97)

Troubleshooting 97
1. Verify the bypass utility.
2. Check for one of the following alarms:
o Bypass over or under voltage
o Bypass over or under frequency
o Bypass unavailable
Check Parallel Board condition
Possible cause: The UPS does not recognize another paralleled UPS.
Action:
1. From the UPS Status menu, select the Units on Parallel Card option and be sure that all UPSs appear in
the list.
2. If any UPS is missing, verify the Parallel UPS Card connections and recheck the status from the UPS front
panel. See "Configuring the Parallel UPS Card (on page
41 )."
3. If all UPSs appear in the list, verify the redundant signal wiring (on page 78 ) connections.
4. Set the system to Auto-Bypass mode (on page 66 ).
5. If the condition persists, contact an HP authorized service representative.
Configuration error and UPS does not start
Possible cause: The UPS failed to identify itself as a paralleled UPS within two minutes after utility power
was applied.
Action:
1. Verify the Parallel UPS Card wiring connections. See "Configuring the Parallel UPS Card (on page
41 )."
2. If the condition persists, contact an HP authorized service representative.
Phase rotation verification
Action: Before installing the UPS, an electrician must check the phase rotation. The rotation should be A, B,
C, or X, Y, Z.
Power is not available at the UPS output receptacle
Possible cause:
• The UPS is in Standby mode (on page 64 ).
• the REPO switch is active or the REPO connector is missing.
Action:
1. Reset the REPO switch
2. Verify the REPO port connection (" Verifying the REPO port connection " on page 71 ).
3. For 12kVA models, be sure that the output circuit breaker is in the On position.