Emerson 400V Manuel D’Utilisation

Several items of optional equipment are available for connection to the Liebert NX UPS. These are 

described in this section of the manual and should be fitted prior to installation.

In addition to the dry output back-feed protection contact provided for tripping of an external circuit-

breaker upon a shorted static bypass semiconductor condition (refer to 1.8.4 - Output Dry Con-

tacts), an optional contactor can be fitted in series with bypass semiconductors (SCR) in order to pro-

vide air-gap isolation between upstream of the UPS input bypass mains and the Inverter output. The 

power supply to the coil of contactor is taken from the bypass mains input line voltage. When the 

bypass mains input is unavailable, the contactor is opened and the UPS is disconnected from the 

bypass mains supply.

Seismic anchors avoid or lessen the damage caused by a possible earthquake or vibration and ensure 

that the UPS does not overturn or move laterally under such a situation.

The Seismic Anchor classification when bolted into a suitable concrete slab, exceeds the requirements 

of Level 2, Table 2 IEC60068.3.3 and complies with UBC 1994, Seismic Zone 4 for strong to very 

strong earthquakes

The standard degree of protection is IP20. A canopy option for IP21 is also available.

The battery start kit consists of controls, a push button, a charging resistor and an internal battery 

contactor that replaces any end of discharge battery circuit breaker trip control. The battery is perma-

nently connected to the UPS DC input.

30-120kVA 

500 (19.7) 

83 (3.3)

140-200kVA

750 (29.5)

83 (3.3)