Applicable Systems
Symmetra LX
Symptoms
The DC bus has a fault. The DC bus voltage or current is abnormal.
Possible Causes
- DC bus capacitor failure
- DC bus voltage regulation fault
Troubleshooting Steps
- Step 1: Check the UPS fault log for the specific dc bus fault sub-code
Detailed fault information is obtained - Step 2: Contact APC support with the fault code for diagnosis
Support confirms the faulty component
How to Reset
To reset: Power-cycle the UPS. If the error persists, contact APC support for repair.
Source: APC Smart-UPS User Manual, Schneider Electric/APC
Category: UPS