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.
7.3.10
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
or Section
.
CAUTION
Do not attempt to restart the system after Load Off until you have identified
and cleared the cause of the shutdown.
7.4 UPS control instructions
7.4.1
Starting a single UPS
Make sure that the load level does not exceed the single UPS capacity.
To start the UPS:
1.
Open the UPS front door.
2.
If included inside the UPS system, check that the rectifier input switch S1 is
closed.
3.
Check that the battery breaker CB1 is closed.
4.
Close the UPS front door.
5.
Close the UPS input feeder circuit breaker.
Eaton 91PS/93PS UPS 8–40 kW
User's and installation guide
©
Eaton Corporation plc 2018. All rights reserved.
Revision: 005
Document ID: P-164000493
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