Redundant Back-Feed Protection | Emerson 50 and 60 Hz, 400V specification

Options—For Assembly Inside the UPS Cabinet

9.0OPTIONS—FOR ASSEMBLY INSIDE THE UPS CABINET

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.

9.1Protection

9.1.1 Redundant Back-Feed Protection

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.

9.1.2 Seismic Anchors

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.

Table 25 Seismic anchor sizing

	Anchor Width	Anchor Length
UPS	mm (in)	mm (in)

30-120kVA	500 (19.7)	83 (3.3)

140-200kVA	750 (29.5)	83 (3.3)

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

9.1.3 Degree of Protection for the UPS Enclosure

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

9.1.4 Battery Start Facility

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.

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30-200kVA, 400V, 50 and 60 Hz specifications

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Emerson 50 and 60 Hz Redundant Back-Feed Protection, Seismic Anchors, Battery Start Facility

Models: 30-200kVA 400V 50 and 60 Hz