3. Select Disable VMMS.
The UPS system transfers to the battery mode and then to the double
conversion mode. The green status indicator for normal operation is lit in all
the UPSs and UPMs in the system. The UPS status is shown as UNIT
ONLINE. The UPM status is shown as ACTIVE.
7.4.9 Shut down the UPS system and critical load
To do maintenance or service on the critical load, shut down the power to the
load:
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-energize 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 input and bypass feeder circuit breakers.
4. Repeat the steps 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-energize 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 or disconnect is tripped, and all the UPSs in the system
are turned off.
To restart the UPS system, do the procedure in Section 7.4.1 Start the UPS
system in the double conversion mode or Section 7.4.2 Start the UPS system in
the bypass mode.
© Eaton Corporation plc 2020. All rights reserved. Revision: 001 Document ID: P-164000956 101
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Eaton 93PM G2 UPS 50 – 360 kVA User’s and Installation Guide
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