Chapter 6 Battery 93
Liebert EXM 80kVA ~ 200kVA UPS User Manual
The UPS requires an optional BCB box, which contains one BCB and one BCB control board, to provide
over-discharge and overcurrent protections for the battery. The BCB box can also electrically isolate the
UPS from the battery to minimize the danger of the service personnel at work.
The BCB provides the following functions:
Short circuit protection and EOD protection. The BCB opens automatically when the battery
voltage drops to the EOD voltage point
Support the UPS EPO function. The BCB opens automatically when the EPO switch on the operator
control and display panel of the UPS is pressed
When the UPS has internal fault, the BCB can be automatically tripped to protect against fault
expansion, and then effectively protect the user's property safety
Table 6-3 provides the mechanical specifications of the BCB box.
Table 6-3
Parameters of BCB box
Dimensions (H × W × D) (mm)
Weight (kg)
650 × 1000 × 285
64
The BCB box should be installed as close as possible to the battery. It can be installed on a wall or a
horizontal surface through the installation holes shown in Figure 6-4.
Refer to Figure 6-4 ~ Figure 6-6 to install and connect the BCB box. There are connection terminals in the
BCB box for connecting the power cables from the UPS and battery. For signal cable connection, connect
the accessory cable W812 shown in Figure 6-6.
Note
1. The BCB box can use top cable entry and bottom cable entry. It provides two big and one small cable entry holes
on both the top plate and bottom plate. The big ones are for power cable entry, and the small one is for signal cable
entry. After connection, take appropriate measures to seal the cable entry holes.
2. The signal cable W812 must be run separate from the battery power cables. W812 is a shield cable, both ends of
its shield layer must be connected to the enclosure. The UPS and BCB box must be earthed separately.
3. Make sure that the UPS rectifier has started before closing the BCB.
600
1045
Installation hole
BCB-BOX
Figure 6-4 Installation hole dimension of BCB box (unit: mm)
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