Always
O
n UPS Systems
M0703_NX_Series_Operators_Manual
V1.25
2012-06-12 35
8.2 Shutdown
Procedure
To
completely shutdown
the UPS, please follow the following steps.
a.
Switch off the inverter
– The inverter can be switched off by simultaneously pressing the
inverter off switch (
O
) and the inverter control switch (
◄►
). The load will be automatically
transferred to reserve without interruption.
b.
Open the battery fuse holder
– This will disconnect the batteries from the DC bus and the
UPS no longer has back up available. This fuse holder can be located within the UPS
system or within the battery cabinets.
c.
Open the rectifier breaker
– Opening the rectifier breaker will remove the power source
from the DC bus. The DC bus will start to drop slowly until it reaches a save level of
approximately 20VDC.
WARNING!
Completing the next step will turn off the power to the loads.
Make sure all loads have been turned off before proceeding or the external wrap-around
bypass has been initiated.
d.
Open the reserve breaker
– Before opening the reserve breaker you must make sure there
is no critical load connected to the UPS that requires power. NO OUTPUT POWER WILL
BE SUPPLIED FROM THE UPS ONCE THE RESERVE (UTILITY) BREAKER IS
OPENED.
e.
Open the input breaker
– transformers will de-energized.
Figure 8.1.1
Status Panel Display Under Normal Operation
Circles represent LED’s that are on.