Name: Eaton 91PS
Brand: Eaton
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7.4.9 Shutting down the UPS system and critical load

To do maintenance or service on the critical load, shut down the power to the load

by performing the following procedure:

1. Turn off all the equipment that is powered by the UPS system.

2. Do the LOAD OFF procedure (see Section 7.4.10 De-energizing the critical

load).

The input, output, and bypass backfeed contactors open, the battery breaker

or disconnect is tripped, and the power module is turned off.

3. Open the UPS front door.

4. Open the rectifier input switches.

5. Make sure that the battery breaker is open.

6. Close the UPS front door.

7. Open the UPS input and bypass feeder circuit breakers.

8. Repeat steps 3–7 for all the UPSs in the system.

DANGER

Power is still present inside each UPS cabinet until the upstream feeder

circuit breaker is opened, and in case of a parallel system, the output is

isolated or parallel units are shut down as well.

7.4.10 De-energizing the critical load

Initiate a UPS system Load Off by pressing the Load Off button in the

Controls→System Controls screen. This button can be pressed to control the

UPS output. The Load Off button de-energizes the critical load and shuts down

the UPS system. The UPS system (including bypass) remains off until it is

restarted.

1. Press Load Off.

The shutdown screen appears, providing a choice to proceed or abort the

shutdown.

2. To shut down the UPS, press Load Off. To abort the shutdown, press Abort.

NOTE: All power to the critical load is lost when Load Off is selected. Only use

this feature when you want to de-energize the critical load.

When Load Off is selected, the input, output, and bypass backfeed contactors

open, the battery breaker CB1 or disconnect is tripped, and all the UPSs in the

system are turned off.

To restart the UPS system, follow the procedure in Section 7.4.1 Starting the UPS

system in the double conversion mode or Section 7.4.2 Start the UPS system in

the bypass mode.

Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide

Eaton 91PS User Manual

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