De-Energizing The Critical Load - Eaton 93PR Series User And Installation Manual

2. Perform the LOAD OFF procedure (see Chapter 6.4.8 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.
Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is opened.
3. Unfasten the front door latch and swing the door open.
4. Open the rectifier input switches, bypass input switch, neutral switch if included in the UPS system, and
verify that battery breaker
is open, and close the front door.
5. Open the UPS input and bypass feeder circuit breakers.
6. Repeat steps 3-5 for all UPSs in the system.
6.4.8

De-energizing the Critical Load

A UPS system Load Off is initiated by the load Off button from Controls > System Controls screen. This
button can be pressed to control the UPS output. The load Off button de-energizes the critical load and
powers down the UPS system.
The UPS system (including Bypass) remains off until restarted.
1. Press load Off.
The shut down screen appears, providing a choice to proceed or abort the shutdown.
All power to the critical load is lost when Load Off is selected in the following step. You should use this feature
only when you want to de-energize the critical load.
2. To shut down the UPS, press load Off. To abort the shutdown, press ABORT. When load Off is selected,
the input, output, and bypass backfeed contactors open, the battery breaker or disconnect is tripped, and all
the UPSs in the system are turned off.
Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is opened.
3. To restart the UPS system, follow the procedure in Chapter 6.4.1 Starting the UPS system in Double
Conversion Mode or Chapter 6.4.2 Starting the UPS system in Bypass Mode.
65
dANGER
NOTE
dANGER
25-75 kW
User's and Installation Guide