Parallel System and LBS System Installation
41
Liebert
®
APM
™
Figure 25 Output breaker control wiring
4.2.7 Parallel Cables
Shielded and double-insulated parallel control cables available in lengths of 16.4ft. and 32.8ft. (5m
and 10m) must be interconnected in a ring configuration between the UPS modules, as shown in
. The parallel ports J1 and J2 are provided on the front panel of the bypass module, as
shown in
. The ring connection ensures the reliability of the control of the parallel system.
Be sure to verify the reliable cable connection before starting up the system!
Figure 26 Connection of parallel control cables of parallel system
NOTE
Use the shortest parallel control cables possible for the application . Do not coil excess cable.
Meanwhile, separate the parallel control cables from the power cables to prevent electrical
inteferences.
UAM0180D
Rev. 1
Buyout Liebert APM Paralleling Switchboard
Notes
1. See drawings UAM01080A, UAM01080B,
UAM01080C, UAM01080E and UAM01080F.
2. MBB auxiliary switch connections are on the normally
closed and common positions.
3. MOBs auxiliary switch connections are on the normally
open and common positions.
Field-Supplied Wiring
Liebert APM Bypass Module
Only One Shown
UHRF3S67X2 (J5)
Liebert
APM #2
Liebert
APM #1
J5
TB2
UIB
UIB
AC Output
4-Wire + GND
MOB1
MBB
MIB
MOB2
See Note 3
See Note 3
See Note 2
System
AC Input
4-Wire + GND
1
2
3
4
1
2
3
X2 J5
1
2
3
4
5
6
4
Notes
1. See drawings UAM01080A, UAM01080C,
UAM01080D, UAM01080E and UAM01080F.
2. Load Bus Sync cable not used with parallel system.
Factory-Supplied Wiring
Liebert APM 2
Liebert APM 1
J1
J2
J2
J2
J1
J1
Parallel Control Cables
UHRF3S67X2 (J1, J2)
Liebert APM Bypass Module
Only One Shown
UAM1080B
Pg. 2, Rev. 0