Probable cause:
1. The Back-UPS is not connected to utility power.
2. The utility input voltage is out of range.
3. The circuit breaker has been tripped.
4. The internal battery is not connected.                                                                                                                           Solution:  1. Ensure that the Back-UPS is securely connected to a utility power outlet or try connecting to a different wall socket.
2.Disconnect non-essential equipment from the Back-UPS. Reset the circuit breaker. Re-connect equipment one item at a time. If the circuit breaker is tripped again, disconnect the device that caused the trip.
3.Connect the battery.

Released for: Schneider Electric India