Liebert® BDC

7.0LIEBERT® 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 NXframe 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

UPS AC input and AC output cables are factory-supplied when UPS and Bypass

Distribution Cabinet are bolted together

Bypass Distribution Cabinet

Isolation

 

MBB

Transformer

* AC Input

SKRU

3W + G

 

 

UPS Cabinet

 

CB3

BIB

CB2

 

Static Bypass

Remove Jumper

 

 

for Dual Input

 

 

Configuration

CB5

MIB

CB1

Rectifier

Inverter

 

 

Converter

 

2 Wire + Ground

225A

42 Poles

225A

42 Poles

225A

42 Poles

225A

42 Poles

Local Grounding Electrode

200kVA Only

Battery Cabinet

Field-Supplied Wiring

* External Overcurrent

Protection By Others

MBD

FPC12004 Rev. 3

7.1Normal (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.

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Emerson 40-200KVA user manual Normal UPS Mode, Liebert BDC