Emerson 480V, 60HZ user manual Liebert NX 40-120kVAConnections, Liebert NX 160-200kVAConnections

Electrical Connections

2.1.4Cable Connections

The rectifier input, bypass and output are easily accessible from the front of the unit for installation. All require lug type terminations. They are connected to busbars on the front side of the Liebert NX and below the circuit breaker, as shown in Figure 4. These busbars are accessible when the front side panel is removed. Busbars to connect external batteries are accessible from the front of the UPS.

NOTE

External connection access requires removal of a protective panel on the lower front of the UPS.

Figure 4 Input and output busbars

Liebert NX 40-120kVA Connections

Battery Input

Connections

Rectifier Input Busbars (Phases are indicated by

letters below the

bars)

Bypass Input Busbars (Phases are indicated by letters below the bars)

Output Busbars (Phases are indicated by letters below the bars)

Ground

Busbar

Liebert NX 160-200kVA Connections

Battery Input

Connections

Rectifier Input Busbars (Phases are indicated by letters below the bars)

NOTE

Output Busbars (Phases are indicated by letters below the bars)

Ground

Busbar

Bypass Input Busbars (Phases are indicated by letters below the bars)

There is no battery fuse in the UPS; the battery cabinet must include a circuit breaker to cut off the current in case of short circuit. Refer to Table 8 for current ratings.

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