Liebert 1000kVA - Manual (Page 88)

Operation
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3.3.9 System Shutdown
Perform a System Shutdown procedure when you must disconnect the UPS system components from
all power sources when required for maintenance procedures.
Use the Shutdown Procedures screen when performing a manual System Shutdown.
Refer to 3.4.5 - Shutdown Procedures.
Refer to 3.3.10 - Maintenance Bypass.
Before performing any maintenance on your Liebert Series 610 UPS System, observe ALL of the
WARNINGS in 4.0 - Maintenance.
Figure 61 System shutdown
3.3.10 Maintenance Bypass
Maintenance Bypass switchgear (cabinet, panelboard, switchboard or custom switchgear) allows you
to totally isolate the UPS system from all power sources, while you maintain power to the critical
load.
Your installation may have a two-breaker, three-breaker or four-breaker maintenance bypass or none
at all. The main differences are the locations of the Rectifier Input Breaker and the Bypass Input
Breaker (BIB).
Another option that may be present at your site is an alternate power source (generator) and an auto-
matic transfer switch (ATS).
Note that to totally isolate the UPS system from all power sources, the Main Input switchgear and
battery circuit breakers must also be opened
!
WARNING
Lethal voltages are present within this system even when it is not on or when power is not
being supplied. Observe all cautions and warnings in this manual. Failure to do so could
result in serious injury or death. Do not work on or operate this equipment unless you are
fully qualified to do so! Never work alone.
BIB
SKRU
MIB
MBB
I
R
CB2
System
Controls
BFB
Output
SBB
SBS
BFB
I
R
I
R
CB2 CB2
#2 UPS
CB1
#1 UPS
CB1
#3 UPS
CB1
RIB RIB RIB
SCCT
SCCT
(can accommodate up to 6 UPS modules)
To Critical Load
Battery
MBD
Battery
MBD
Battery
MBD