System Shutdown; 3.3.10 Maintenance Bypass; Figure 61 System Shutdown - Liebert 1000kVA Operation & Maintenance Manual

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.
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.

Figure 61 System shutdown

UPS
CB1
CB2
MBD
Battery

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
RIB RIB
#3 UPS #2
CB1
R R
I I
CB2
MBD
Battery Battery
RIB
UPS #1
CB1
SBS
R
SBB
I
System
CB2
Controls
Output
SCCT
MBD
(can accommodate up to 6 UPS modules)
82
Operation
BFB BFB
BIB
MBB
SKRU
MIB
To Critical Load
SCCT