UPS Multi-Module Installation

Figure 15 Dry contacts, multiple UPS modules with distribution panel

Input Distribution

UPS 1

UPS 2

UPS N

M3 Board

M3 Board

M3 Board

X3

X3

X3

Ext. Maint. Ext. Out

Ext. Maint. Ext. Out

Ext. Maint. Ext. Out

1

2

3

4

1

2

3

4

1

2

3

4

Q1ExtQ2ExtQnExt

QUPS

Distribution Panel

QByp

 

 

To Load

3.2.2External Protective Devices

Refer to the instructions in 1.0 - Single Module UPS Installation.

3.2.3Power Cables

The wiring of power cables is similar to that of single module system. The Bypass and the Main input sources must be referenced to the same neutral potential and input earth leakage monitoring devices, if installed, must be located upstream of the common neutral sinking point. Refer to the instructions in 1.0 - Single Module UPS Installation.

NOTE

The length and specification of power cables including the bypass input cables and UPS output cables should be the same. This facilitates load sharing when operating in bypass mode.

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Liebert NX UPS System user manual External Protective Devices, Power Cables