UPS OPERATING INSTRUCTIONS
Eaton
Power Xpert 9395P-600 (380V-600V) UPS Installation and Operation Manual
S
P-164000710 Rev 1
www.eaton.com/powerquality
7-38
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Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is opened.
7.5.12
Using the UPS LOAD OFF Command
A UPS Load Off is initiated by either a command or a pushbutton. It controls the
UPSs' outputs by powering down the UPS and de‐energizing the critical load. The
UPSs (including Bypass) remain off until restarted.
This procedure initiates a UPS Load Off using the
LOAD OFF
command.
NOTE
The UPS LOAD OFF controls each UPS independently and does not shut down the whole distributed
bypass system unless all UPSs have been transferred to bypass. To immediately shut down the whole system,
use the REPO switch (see paragraph 7.5.13).
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All power to the critical load is lost when a LOAD OFF command is issued in the following step. You should
use this feature only when you want to de‐energize the critical load.
To use the
LOAD OFF
command:
1.
Press the
CONTROLS
pushbutton on the main menu bar of the UPS to be shut
down. 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.
6.
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 UPS.
7.
If another UPS is to be shut down, proceed to that UPS and repeat
Steps 1 through 6.
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Do not attempt to restart the system after the Load Off until the cause of the shutdown has been identified
and cleared.
8.
Restart the UPS by following the procedure in paragraph 7.5.1 or 7.5.2.