UPS OPERATING INSTRUCTIONS
Power Xpert
9395 UPS (450–550 kVA) Installation and Operation Manual
164201701 Rev 3
www.eaton.com/powerquality
7-41
11.
Verify External Communications Failure alarm has cleared and no other alarms
are active on the online UPSs.
12.
On the System Status screen, select the
UPS
command.
13.
Press the
CONTROLS
pushbutton on the System Status menu bar. The UPS
Control Command screen is displayed.
14.
On the UPS Control Command screen, select
GO TO ONLINE
.
15.
Press the
SELECT
pushbutton on the UPS Command menu bar.
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:
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.
The
ONLINE
status indicator is illuminated. The UPS status indicates
ONLINE
. The
UPM status indicates
ONLINE, CHARGER ON
.
7.4.23
UPS 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 distributed bypass system.
2.
Transfer the UPSs to bypass by performing the procedure in paragraph 7.4.5.
3.
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.
W
A
R
N
I
N
G
Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is opened.
4.
If the UPSs contain input breakers (CB1), open all UPS input breakers.
5.
Open the input and bypass feeder circuit breakers on all UPSs .
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