UPS will not operate on utility power or may be clicking between utility and battery power.
Back-UPS RS/XS & Back-UPS CS (4-LED Interfaces)
All models & serial numbers
This may be caused by one of the following conditions;
- Low Voltage / Sag
- High Voltage / Over-Voltage
- Frequency is out of range
- Total Harmonic Distortion
The following video details the process for manually adjusting the Back-UPS RS & XS or Back-UPS CS system's AC Input Sensitivity.