Ups And Critical Load Shutdown - Eaton Power Xpert Plus 1 Installation And Operation Manual

11. Verify External Communications Failure alarm has cleared and no other alarms
12. On the System Status screen, select the
13. Press the
14. On the UPS Control Command screen, select
15. Press the
NOTE 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.
16. Verify the following messages display sequentially on the UPS status line:
7.4.23

UPS and Critical Load Shutdown

To perform maintenance or service on the critical load, shut down power to the load:
1.
2.
3.
Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is opened.
4.
5.
t
Power Xpert 9395 UPS (450–550 kVA) Installation and Operation Manual
are active on the online UPSs.
pushbutton on the System Status menu bar. The UPS
CONTROLS
Control Command screen is displayed.
pushbutton on the UPS Command menu bar.
SELECT
DC STARTING, CHARGER OFF
INVERTER STARTING
INVERTER SYNCING
ONLINE, CHARGER ON
The rectifier and inverter turn on. The inverter continues to ramp to full voltage.
Once the inverter reaches full voltage, the UPS output contactor (K3) closes.
Power is now supplied to the critical load in Online mode along with the other
UPSs online. It takes approximately one minute for the UPS to achieve Online
mode.
status indicator is illuminated. The UPS status indicates ONLINE. The
The
ONLINE
UPM status indicates ONLINE, CHARGER ON.
Turn off all equipment that is being powered by the distributed bypass system.
Transfer the UPSs to bypass by performing the procedure in paragraph 7.4.5.
Perform the LOAD OFF procedure in paragraph 7.4.25.
The input, output, battery, and bypass backfeed contactors open, and the power
module is turned off.
If the UPSs contain input breakers (CB1), open all UPS input breakers.
Open the input and bypass feeder circuit breakers on all UPSs .
UPS OPERATING INSTRUCTIONS
command.
UPS
GO TO ONLINE
W A R N I N G
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