UPS OPERATING INSTRUCTIONS
EATON
Powerware
®
9395 UPS (650–825 kVA) Installation and Operation Manual
S
164201725 Rev 2
www.powerware.com
7−26
7.4.10
Using the UPS LOAD OFF Pushbutton or Command
A UPS Load Off is initiated by the
LOAD OFF
pushbutton from the main menu bar, the
Load Off command on the UPS Control Command screen, or Load Off command on
the Bypass Control Command screen. The UPS
LOAD OFF
controls the UPSs outputs
by powering down the UPS and de-energizing the critical load.
The UPSs (including Bypass) remain off until restarted.
NOTE
The UPS Load Off controls each UPS independently and does not shutdown the whole distributed
bypass system. To immediately shutdown the whole system, use the REPO switch (see paragraph 7.4.11).
To use the
LOAD OFF
pushbutton:
1.
Press the
LOAD OFF
pushbutton on the UPS to shutdown.
The Load Off screen is displayed, providing a choice to proceed or abort the
shutdown.
C
A
U
T
I
O
N
All power to the critical load is lost when the LOAD OFF is selected in the following step. You should use this
feature only when you want to de-energize the critical load.
2.
To shut down the UPS, press
LOAD OFF
from the Load Off menu bar, and hold for
three seconds. To abort the shutdown, press
CANCEL
.
When LOAD OFF is selected and held for three seconds, the input, output,
battery, and bypass backfeed contactors open, and the power module is turned
off on the UPSs.
3.
If another UPS is to be shutdown, proceed to that UPS and repeat Steps 1 and 2.
C
A
U
T
I
O
N
Do not attempt to restart the system after Load Off until the cause of the shutdown has been identified and
cleared.
4.
Restart the UPS after pressing the
LOAD OFF
pushbutton by following the
procedure in paragraph 7.4.1 on page 7−20 or 7.4.2 on page 7−21.
W
A
R
N
I
N
G
Power is present inside the UPS cabinet sections until the upstream input feeder circuit breaker is opened.
To use the
LOAD OFF
command:
1.
Press the
CONTROLS
pushbutton on the main menu bar of the UPS to be
shutdown. The System Status screen is displayed.
2.
On the System Status screen, select either the
UPS
or the
BYPASS
command.
3.
Press the
CONTROLS
pushbutton on the System Status menu bar. The UPS or
Bypass Control Command screen is displayed.
4.
On the Control Command screen, select
LOAD OFF
.
5.
Press the
SELECT
pushbutton on the Command menu bar.
The Load Off screen is displayed, providing a choice to proceed or abort the
shutdown.
