1027212
UPS 225 - 275 kVA/300kVAPF0.8
109
Revision E
User’s and Installation Guide
7.
Perform the LOAD OFF procedure in Section 7.4.31 on the UPS being shut down.
The input, output, battery, and bypass backfeed contactors open, and the power module is turned
off on the UPS being shut down.
Logic power remains on.
8.
Verify the battery breaker or disconnect for the UPS being shut down is open. If not, open the
breaker.
WARNING
Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is
opened.
NOTE
If the UPS contains an input breaker (CB1), DO NOT open the breaker unless no input feeder
breaker is installed.
9.
Open the input and bypass feeder circuit breakers for the UPS being shut down.
The UPS is now completely shut down.
External Communications Failure alarm is active on remaining online UPSs. This is an expected
event and will clear upon UPS restart.
7.4.27 Single UPS shutdown using UPM shutdown
NOTE
To shut down a single UPS, MOBs with dual auxiliary contacts must be installed and connected
according to the procedure in Section 5.2 on page 47.
To shut down a single UPS:
1.
Open the MOB for the UPS being shut down.
2.
On the UPS being shut down, press the CONTROLS pushbutton on the main menu bar. The
System Status screen is displayed.
3.
On the System Status screen, select the
BYPASS
command.
4.
Press the CONTROLS pushbutton on the System Status menu bar. The Bypass Control Command
screen is displayed.
5.
On the Bypass Control Command screen, select
GO TO BYPASS
. If the MOB of the UPS is not
open, do not bypass.
6.
Press the SELECT pushbutton on the Bypass Command menu bar.
The UPS being shut down transfer to Bypass mode.
The BYPASS status indicator is illuminated. The Bypass status indicates
ON
. The UPM status indi-
cates
READY
. The power module remains on.
7.
On the System Status screen, select the UPM command. The UPS Control Command screen is
displayed.
8.
On the UPS Control Command screen, select the
UPM 1
command.
9.
Press the CONTROLS pushbutton on the UPS Control Command menu bar.
10. On the UPM 1 Control Command screen, select
UPM OFF
.
