Internal error - The UPS has detected an internal error and is no longer providing power to the connected equipment.
Possible Solution :
do cold start without any load and check if UPS is going on to battery, if the cold start is passed, then add load one by one and check whether still the UPS is running on battery.
Start the UPS on Battery i.e. Cold Start the UPS: Press the ON button, if you hear a beep and output is coming from UPS, then cold start is passed.
If you hear only beep and no output, then battery is deep discharged and you need to charge the UPS for 6 hours in off mode and then Switch ON
If the issue still persist than Contact APC by Schneider Electric support.
Possible Solution :
do cold start without any load and check if UPS is going on to battery, if the cold start is passed, then add load one by one and check whether still the UPS is running on battery.
Start the UPS on Battery i.e. Cold Start the UPS: Press the ON button, if you hear a beep and output is coming from UPS, then cold start is passed.
If you hear only beep and no output, then battery is deep discharged and you need to charge the UPS for 6 hours in off mode and then Switch ON
If the issue still persist than Contact APC by Schneider Electric support.