CAUTION
Do not attempt to restart the system after Load Off until you have
identified and cleared the cause of the shutdown.
7.5 UPS control instructions
7.5.1 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. Make sure that the battery breaker CB1 is closed.
4. Close the UPS front door.
5. Close the UPS input feeder circuit breaker.
6. Close the UPS bypass input feeder circuit breaker.
7. Wait for the UPS control panel display to become active and indicate logic
power.
8. In the home screen, press Controls.
9. Press the UPS controls button.
In the UPS controls screen, the system status is shown as SHUTDOWN.
10. In the UPS controls screen, press the Go online button.
If Auto Bypass is enabled (factory default), the critical load is immediately
supplied by the bypass source in the bypass mode, until the inverter turns on
and the UPS transfers to the double conversion mode. The yellow status
indicator on the UPS control panel indicates that the UPS is in the bypass
mode. If auto bypass is not enabled, the UPS output remains off until the
UPS system transfers to the double conversion mode.
11. In the UPS control screen, press the Go online button.
12. Wait for the following messages to appear sequentially on the UPS status
line:
STARTING
ONLINE
The UPS system is now operating in the double conversion mode and the green
status indicator for normal operation is lit.
© Eaton Corporation plc 2020. All rights reserved. Revision: 006 Document ID: P-164000493 100
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Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide
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