Emerson Liebert NX User Manual download pdf (Page 38)

UPS Multi-Module Installation

3.3.3 Power Cables

The wiring of power cables is similar to that of single module system except that the output of the

upstream UPS is fed into the bypass input of the downstream UPS, and the load is fed by the down-

stream UPS through its inverter or bypass. The bypass and the main input sources must be refer-

enced 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 Mod-

ule UPS Installation.

No control wires other than those specified for the single module configuration are required.

Figure 17 Hot standby configuration

INPUT DISTRIBUTION

CB1

UPS1

OUTPUT

CB1

DOWNSTREAM UPSTREAM

RECTIFIER

STATIC

SWITCH

INVERTER

Mains L1,

L2, L3, N

L1, L2, L3, N L1, L2, L3, N

Bypass L1,

L2, L3, N

Bypass L1,

L2, L3, N

Mains L1,

L2, L3, N

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Emerson Liebert NX User Manual Page 38