Maintenance, Servicing And Faults - CyberPower OLS3S15KE User Manual

The UPS output terminal block may be electrically lived even if the UPS system
is not connected to the building wiring terminal, for there is internal current
source (batteries).
In order to fully disconnect the UPS, turn the Main1/Main2/N input breaker in the
"OFF" position, then disconnect the mains lead.
Ensure that no liquid or other foreign objects can enter the UPS.

1.3. Maintenance, Servicing and Faults

The UPS operates with hazardous voltages. Repairs should be carried out only
by qualified maintenance personnel.
Caution - risk of electric shock. Even after the unit is disconnected from the
mains power supply (building wiring terminal), components inside the UPS are
still connected to the battery which are potentially dangerous.
Before carrying out any kind of service and/or maintenance, please disconnect
the batteries. Verify that no current is present and no hazardous voltage exists in
the capacitor or BUS capacitor terminals.
Batteries must be replaced only by qualified personnel.
Caution - risk of electric shock. The battery circuit is not isolated from the input
voltage. Hazardous voltages may occur between the battery terminals and the
ground. Verify that no voltage is present before servicing!
Batteries have a high short-circuit current and pose a risk of shock. Take all
precautionary measures specified below and any other measures necessary
when working with batteries:
─ remove all jewellery, wristwatches, rings and other metal objects
─ use only tools with insulated grips and handles.
When changing batteries, replace with the same quantity and the same type of
batteries.
Do not attempt to dispose of batteries by burning them. It could cause explosion.
Do not open or destroy batteries. Effluent electrolyte can cause injury to the skin
and eyes. It may be toxic.
Please replace the fuse only by a fuse of the same type and of the same
amperage in order to avoid fire hazards.
Do not dismantle the UPS, except the qualified maintenance personnel.
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