Digital Lbs; Figure 5 Inter-Module Communication Board Wiring Diagram-Multi-Modules; Figure 6 Inter-Module Communication Board Wiring Diagram-Digital Lbs; Table 6 Wire Size, Length For Digital Lbs Connection Of Ups Inter-Module Communication - Liebert NXL Installation Manual

Figure 5 Inter-Module Communication Board wiring diagram—Multi-modules
P3103
IMC
02-806730-xx
P3101
UPS 1
2.4

Digital LBS

The Load Bus Sync interface enables independent UPS units to remain in sync when operating on
battery or when supplied by unsynchronized input sources.
Digital LBS cables that connect the module to the system are connected to terminals P3108 and
P3109 on the Inter-Module Communication (IMC) board. See Figure 6
Table 6 Wire size, length for digital LBS connection of UPS Inter-Module Communication

Boards

Terminal Designation
From
Digital LBS from UPS inter-module communication board to other UPS inter-module
communication board
P3108-1
P3108-2
P3108-3
Redundant Digital LBS from UPS Inter-Module Communication Board to Other UPS
Inter-Module Communication Board
P3109-1
P3109-2
P3109-3
1. Belden 810x or Belden 89901 cables are the only approved cables.
2. Each cable group should be run in a separate grounded conduit to ensure redundancy.
3. The maximum lengths must include all the LBS cables from the first module to the last module.
4. The primary and redundant cable lengths can be counted separately.
5. Belden 89901 cable can be used for underground installations.
6. Attach the control wire to the side of the control door where the Inter-Module Board (IMC) is attached.
Do not run wires across the IMC board.
Figure 6 Inter-Module Communication Board wiring diagram—Digital LBS
P3108
IMC
02-806730-xx
P3109
UPS 1
02-806730-xx
To
P3108-1 LBS Synch CANH
P3108-2 LBS Synch CANL
P3108-3 Ground - Drain Wire
P3109-1 Redundant LBS Synch CANH
P3109-2 Redundant LBS Synch CANL
P3109-3 Ground - Drain Wire
02-806730-xx
P3103
IMC
P3101
UPS 2
Signal Name
P3108
IMC
P3109
UPS 2
14
UPS Electrical Installation
IMC
02-806730-xx
UPS 3
.
Wire Size/
Max Length
3000ft
(900m)
3000ft
(900m)
IMC
02-806730-xx
UPS 3
P3103
P3101
P3108
P3109