Emerson Liebert NX User Manual download pdf (Page 27)

Battery Installation

2.3 Battery Cabinet

2.3.1 Introduction

This cabinet can also be used in conjunction additional cabinets, to provide the necessary accommoda-

tion required by the larger cells associated with system’s having a long autonomy time.

Where two (or more) cabinets are used they are positioned alongside each other and secured and

bonded together. If the cabinet(s) is located immediately adjacent to the main UPS equipment the two

units are bolted together.

2.3.2 Temperature Considerations

Valve-regulated, lead acid battery cells are sensitive to ambient temperature and should be operated

between 15°C and 25°C (59-77°F). Battery capacity is increased by 1% for every 1°C (2°F) increase in

temperature up to 25°C (77°F). Battery life is reduced at temperatures above 25°C (77°F).

When batteries are mounted in the same room as the UPS unit, it is the battery that dictates the

designed maximum ambient temperature, not the UPS. — i.e. in the case of valve-regulated cells, the

ambient room temperature should be kept between 15°C and 25°C (59-77°F), and not between 0°C

and 40°C (32-104°F) (which is the specified main equipment operating temperature range). Tempera-

ture deviations are permissible for short periods, provided the average temperature does not exceed

25°C (77°F).

2.3.3 Dimensions

The external dimensions are shown in Table 8. These are the same height and depth as the UPS

module and provide a matching appearance when bolted together. All cabinets are fitted with doors,

which must be fully opened in order to fit or remove the batteries. The door swing must therefore be

taken into consideration when planning the positioning of the cabinets.

2.3.4 Weight

The unladen weight is shown below in Table 8. When designing the battery installation the weight of

the batteries and cables must be added to the unladen weight. This is particularly important when

placing the NX on a raised floor.

2.3.5 Circuit Isolator Features

The UPS is fitted with Anderson connectors and fuses for connection and disconnection of internal

batteries. External battery banks require battery fuses or circuit breaker (with optional status con-

tacts). Refer to 1.8.3 - External Circuit-Breaker Interface for details.

Table 8 Dimensions and weight

Model

Optional

Circuit Breaker

Amperes

Maximum

Discharge Current

(at EOD)

External Cabinet

WxDxH mm (in)

Cabinet Weight

Without Batteries

kg (lb)

Battery Cabinet

50A

10kVA 22A

15kVA 33A

20kVA 44A

820x700x1400

(32-1/4x27-5/8x55)

170 (375)

80A 30kVA 66A

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 87 88

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Emerson Liebert NX User Manual Page 27

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