Liebert NX UPS System user manual Battery Cabinet

Battery Installation

2.3Battery Cabinet

2.3.1Introduction

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.

2.3.2Temperature 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).

2.3.3Dimensions

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.

2.3.4Weight

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.

Table 8	Dimensions and weight
		Optional	Maximum		Cabinet Weight
		Circuit Breaker	Discharge Current	External Cabinet	Without Batteries
Model		Amperes	(at EOD)	WxDxH mm (in)	kg (lb)
			10kVA 22A
Battery Cabinet		50A	15kVA 33A	820x700x1400	170 (375)
			20kVA 44A
				(32-1/4x27-5/8x55)
		80A	30kVA 66A

2.3.5Circuit 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.

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