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Liebert
®
BDC
™
41
7.0 LIEBERT
®
BDC
™
The Liebert BDC is designed to operate in UPS mode, bypass mode and maintenance mode. The
Liebert BDC offers either 45kVA or 90kVA capacity to match the associated Liebert NX
™
frame
offerings. Each of the Liebert BDC capacities offer optional 480V and 600V internal transformers as
well as multiple output distribution selections.
Figure 20 Single input UPS with external Liebert BDC with optional internal transformer—typical
configuration
7.1 Normal (UPS) Mode
While the Liebert BDC is in Normal mode (MBB open; BIB/MIB closed), the UPS is supplying the
connected load with continuous, high-quality AC power. In this mode of operation, the load is
protected by the UPS.
Local Grounding
Electrode
UPS AC input and AC output cables are factory-supplied when UPS and Bypass
Distribution Cabinet are bolted together
Field-Supplied Wiring
Static Bypass
SKRU
MBD
CB1
CB5
UPS Cabinet
* AC Input
3W + G
Remove Jumper
for Dual Input
Configuration
Battery Cabinet
FPC12004
Rev. 3
225A 42 Poles
225A 42 Poles
225A 42 Poles
225A 42 Poles
200kVA
Only
Isolation
Transformer
BIB
CB2
CB3
MBB
MIB
2 Wire + Ground
* External Overcurrent
Protection By Others
Bypass Distribution Cabinet
Rectifier
Converter
Inverter