Only authorized professionals are allowed to open the UPS chassis! The UPS input and output voltage is high risk. Contact the high voltage will bring life risk.
Please disconnect the AC power, battery before maintenance.
And test the output terminal block with a voltmeter before maintenance to ensure that the input is turned off and in safe condition.
7.Leakage risk! The UPS must be grounded before electrical connections. The ground terminal must be connected to the ground.
The UPS installation person should have the qualification of high voltage and AC power operation. Power system maintenance and repair could only be done by professional person.
Power system maintenance