106
Copyright © 2021 Eaton Corporation plc. All rights reserved.
6.3. System Control Instructions
6.3.1. Starting the UPS System in Double Conversion Mode
The UPS system can consist of a single UPS or several parallel UPSs.
To start the UPS system:
1. Unfasten the front door latch and swing the door open.
2. (If the UPS contains) Verify that rectifier input switch, output switch, bypass switch are closed
the UPS system, and close the front door.
3. Close the UPS input feeder circuit breaker.
4. Close the UPS bypass input feeder circuit breaker.
5. Observe the UPS control panel display becoming active, indicating logic power. Repeat steps
1-5 for each individual UPS in the system.
6.
Press the
Controls
button in the main menu. The System Controls screen appears.
7. On the System Controls screen, the system status should indicate SHUTDOWN.
8. Press the Go online button on the System Controls screen. If Auto Bypass is enabled, the
critical load is immediately supplied by the bypass source, in Bypass Mode, until the inverter
turns on and the UPS transfers to Double Conversion Mode. The status indicator on the UPS
control panel indicates the UPS is in Bypass Mode. If auto bypass is not enabled, the UPS
output remains off until the UPS system transfers to Double Conversion Mode.
9. Observe the following messages appear sequentially on the System Controls screen:
STARTING
ONLINE
The rectifier and inverter turn on. The DC voltage continues to ramp up to full voltage. Once
the DC link reaches full voltage, and the battery breaker is closed, the UPS output relay K3
closes and the static switch turns off. Power is now supplied to the Critical load in Double
Conversion Mode. It takes approximately 20 seconds for the UPS system to achieve Double
Conversion Mode.
10. The UPS system is now operating in Double Conversion Mode and the NORMAL status
indicator is illuminated in all UPSs in the system.
6.3.2. Starting the UPS System in Bypass Mode
If the inverter output of the UPS is not available and the critical load needs to be energized,
perform the following procedure:
CAUTION
In Bypass Mode, the critical load is not protected from commercial power interruptions
and abnormalities.
Summary of Contents for 93PR Series
Page 1: ...60 1200 kW Installation and Operation Manual Eaton 93PR UPS ...
Page 2: ......
Page 142: ......
Page 143: ...614 40061 01 ...