Vertiv Liebert EXM2 - BCB Box; Parallel Cable; LBS Cable; Back-Feed Contactor Option

For more information of the IS-Relay card, refer to the Liebert® IntelliSlot IS-Relay Card User Manual in accessory.
The installation method of the IS-Relay card is the same as that of the SIC card described in SIC Card (Available in Specific
Regions only) Refer to Signal Cable Connection Steps for the cabling and routing of the signal cables.
9.2.11 BCB Box
Refer to for more information about the specifications, battery connection of the BCB box.
9.2.12 Parallel Cable
Shielded and double-insulated parallel cables available in lengths of 5m, 10m and 15m must be interconnected in a ring
configuration between the UPS modules, as shown in Figure 8.2 on page142. Method: connect a module parallel cable from
its PARA1 port to the PARA2 port of another module. Follow this method to connect other parallel cables.
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!
9.2.13 LBS Cable
Shielded and double-insulated parallel control cables available in lengths of 10m, 15m and 20m. The LBS cable must be
interconnected in a ring configuration of UPS modules LBS, as shown in Figure 8.7 on page150 and Figure 8.8 on page151.
9.2.14 Back-feed Contactor Option
The main back-feed contactor and the bypass back-feed contactor are provided respectively. The contactor is installed
inside the cabinet and is directly supplied by the input power. The contactor is disconnected when the input power is lost.
When the top fan option is selected, the back door of UPS is installed against the wall, and the right-side door shall be opened
for repair and modification of contactor components.
Figure 9.11 W iring of b ack-feed con tactor
10 0 kVA ~ 160kVA
N O. Description
1 Main back-feed contactor
2 Bypass back-feed contactor
9 Options
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Vertiv™ Liebert® EXM2 UPS User Manual