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This procedure must be followed to completely power down the UPS and the load. All power switches, 

isolators and circuit breakers will be opened and power will be removed from the load.
In multi-module systems, perform each step of the procedure in every UPS module before proceeding 

to the next step.

1. Press the EPO (Emergency Power Off) button at the UPS front panel only. This will disable 

Rectifier, Inverter, Static Switch and Battery operation. The load will be de-energized.

2. Open the UPS door to gain access to the main circuit breakers.
3. Open the Rectifier input circuit breaker CB1.
4. Open external battery circuit breaker. This breaker is inside the battery cabinet or is otherwise 

adjacent to the battery racks.

5. Open Output circuit breaker CB5.
6. Open bypass input circuit breaker CB2.
7. Ensure maintenance bypass circuit breaker CB3 is open.
8. All mimic panel LED indications and messages will extinguish as the mains-driven, internal 

power supplies decay.

9. To completely isolate the UPS from the AC supplies, the main external power input isolator (both 

isolators, where dual supplies are provided for rectifier and bypass) and external output isolator 

must be opened and tagged with warning labels accordingly.

Check the input and output wiring of each UPS module. Ensure that the phase rotation sequence of 

the main inputs and the bypass inputs and outputs of each UPS module are the same. Ensure that 

the parallel cables are connected firmly.
It is assumed that the installation is complete, the system has been commissioned by authorized per-

sonnel and the external power isolators are closed. Disconnect the load before startup.

1. Start each UPS normally as described in 9.2 - UPS Startup
2. Turn on the inverter of each UPS module one at a time.
3. Apply the load after the last UPS module transfers to inverter. The total load can be determined 

through the LCD of either UPS.

4. Verify the load rate of each UPS module. If the load rates are roughly the same, then the parallel 

system may be assumed to be operating normally.

NOTE
Before beginning this procedure, shut down the connected load to prevent the possibility of 

Except in an emergency situation, do not press any remote EPO button

The operations described in this section must be performed by authorized electricians or 

qualified technical personnel. If you have any difficulty, call 1-800-LIEBERT for assistance.

NOTE
If one module cannot transfer to inverter mode long after its inverter is on, its output