Emerson 115-50/60HZ Manuel D’Utilisation

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.

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