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0 options-for assembly inside the ups cabinet, 1 protection, 1 redundant back-feed protection – Emerson Liebert NX 50 and 60 Hz User Manual

Page 117: 2 seismic anchors, Table 25 seismic anchor sizing, 3 degree of protection for the ups enclosure, 4 battery start facility, Ptions, Ssembly, Nside

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Options—For Assembly Inside the UPS Cabinet

105

9.0

O

PTIONS

—F

OR

A

SSEMBLY

I

NSIDE

THE

UPS C

ABINET

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.

9.1

Protection

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.

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.

Table 25

Seismic anchor sizing

UPS

Anchor Width

mm (in)

Anchor Length

mm (in)

30-120kVA

500 (19.7)

83 (3.3)

140-200kVA

750 (29.5)

83 (3.3)

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