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9.
Open the all of the UPSs input feeder circuit breaker.
10. If dual feed, open all of the UPSs bypass feeder circuit breaker.
11. If IBCs are installed, open all battery breakers.
The UPS is now completely shut down.
6.4.13 Single UPS Restart
To restart a single UPS from a shutdown state:
1.
Close the MOB for the UPS being restarted.
2.
Close the UPS input feeder circuit breaker for the UPS being restarted.
3.
If dual feed, close the UPS bypass feeder circuit breaker for the UPS being restarted.
4.
If IBCs are installed, close the battery breakers for the UPS being restarted.
5.
On the UPS being restarted, observe the UPS control panel display becoming active, indicating logic
power.
6.
Verify no alarms are active.
7 .
On the UPS being restarted, tap the CONTROLS tab on the main menu navigation bar. The System
Control screen is displayed.
8.
Tap the GO ONLINE button.
9.
If requested, enter the Level 1 password. Default password is 1111.
The rectifier and inverter turn on. The inverter continues to ramp up to full voltage.
Once the inverter reaches full voltage, all UPS inverter switchgear close and the static switches turn off.
Power is now supplied to the critical load in dual conversion mode from all UPSs. It takes approximately
one minute for the UPSs to achieve the dual conversion mode.
The Normal status indicator is illuminated.
NOTE
6.4.14 Parallel System and Critical Load Shutdown
To perform maintenance or service on the critical load, shut down power to the load:
1.
Turn off all equipment that is being powered by the UPS parallel system.
2.
Transfer the UPSs to bypass by performing the procedure in paragraph 6.4.9.
3.
Perform the Load Off procedure in paragraph 6.4.17.
4.
The inverter and bypass switchgear open, and the power module is turned off on all UPSs.
5.
Perform the battery charger off procedure in paragraph 6.4.15.
6.
The rectifier and battery switchgear open.
Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4
If the UPS is starting on a bus with other online paralleled UPSs, the UPS will not go
to bypass during startup. The UPS will start, sync to the other UPSs online, and go
online.
UPS Operating Instructions
www.eaton.com/powerquality
6-31
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