Parallel System and LBS System Installation
Liebert
®
APM
™
40
4.2.4 Power Cable
The power cable wiring is similar to that of the UPS module. Refer to
The bypass and rectifier input supplies must use the same neutral line input terminal. If the input
has a current leakage protective device, the current leakage protective device must be fitted upstream
of the neutral line input terminal.
4.2.5 Input Breaker Control Wiring
Figure 24 Input breaker control wiring for parallel systems
4.2.6 Output Breaker Control Wiring
Auxiliary wiring must be installed as shown in
to protect the system and enable a single
UPS to be isolated and tested during service.
NOTE
The length and specification of power cables including the bypass input cables and UPS output
cables should be the same. This facilitates load sharing in bypass mode.
UAM1080C
Pg. 3, Rev. 1
Notes
1. See drawings UAM01080A, UAM01080B,
UAM01080D, UAM01080E and UAM01080F.
2. Paralleling switchboard requires shunt trip
UIB breakers with 120V coils.
Field-Supplied Wiring
Liebert APM Bypass Module
Only One Shown
Liebert APM Detail View
with Door Open
Backfeed Breaker
Fuse Block (FH1)
Backfeed
Breaker
Fuses, (2) 8
Backfeed
Breaker
Fuses, (2) 8
BDSi
Fuse Block (FH2)
(Optional)
UHRF3S67X2
(J10, J11)
Input Neutral
Ø A
Ø B
Ø C
Input Neutral
Ø A
Ø B
Ø C
Liebert APM
Bypass
Liebert APM
Bypass
Liebert APM #2
Liebert APM #1
UIB Liebert APM 1
Paralleling
Switchboard
UIB Liebert APM 2
Paralleling
Switchboard
J10
J10
J11
J11
J11
J10
TB1
TB1
1
2
3
2
3
2
3
2
3
2
3
4
5
6
7
8
9
10
11
12
Phase
Neutral
Phase
Neutral