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Liebert
®
BDC
™
45
5.0 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 APM frame
offerings. Each of the Liebert BDC capacities offer optional 480V and 600V internal transformers as
well as multiple output distribution selections.
Figure 25 Single input UPS with external Liebert BDCwith optional internal transformer—typical
configuration
5.1 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.
UAM01004
Rev. 3
Field-Supplied Wiring
Notes
1. Install in accordance with national and local electrical codes.
2. Input and bypass must share the same single source.
3. UPS system input and output cables must be run in separate conduits.
4. Control wiring must be run in separate conduits.
5. Optional 54-pole, 225A for 45kVA frame only or optional 54-pole, 400A
for 90kVA frame only.
6. Transformer available: 480V or 600V input.
* System
AC Input
3-Wire + GRD
AC Output
208V
4-Wire + GRD
Optional
54-Pole
See Note 5
Local Grounding
Electrode
See Note 1
BIB - Bypass Isolation Breaker
MBB - Maintenance Bypass Breaker
MIB - Maintenance Isolation Breaker
* External Overcurrent Protection by Others
Static Bypass
Bypass Distribution Cabinet
UPS Cabinet
Battery
BIB
MIB
MBB