UPS Electrical Installation
18
2.5 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 9.
Figure 9 Inter-Module Communication Board wiring diagram—Digital LBS
Table 8 Wire size, length for digital LBS connection of UPS Inter-Module Communication
Boards
Terminal Designation
Signal Name
Wire Size/
Max LengthFrom To
Digital LBS from UPS Inter-Module Communication Board to other UPS Inter-Module Communication
Board
P3108-1 P3108-1 LBS SYNCH CANH
3000ft
(900m)
P3108-2 P3108-2 LBS SYNCH CANL
P3108-3 P3108-3 GROUND - DRAIN WIRE
Redundant Digital LBS from UPS Inter-Module Communication Board to Other UPS Inter-Module
Communication Board
P3109-1 P3109-1 REDUNDANT LBS SYNCH CANH
3000ft
(900m)
P3109-2 P3109-2 REDUNDANT LBS SYNCH CANL
P3109-3 P3109-3 GROUND - DRAIN WIRE
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 control door where the Inter-Module Board (IMC) is attached. Do not run the wire across
IMC board.
UPS 1 UPS 2
UPS 3
P3108
P3109
P3108
P3109
P3108
P3109
IMC
02-806730-xx
IMC
02-806730-xx
IMC
02-806730-xx
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