Emerson Liebert NX 50 and 60 Hz - Manual (Page 31)

Battery Installation
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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 Breaker Features
In 30 to 40kVA models fitted with internal battery and in all models fitted with a Battery Start kit,
the UPS is fitted with an internal contactor for automatic connection and disconnection of the batter-
ies. External battery banks connected to such models generally are protected by a standard battery
circuit breaker (with status contacts and without undervoltage trip coil). Refer to 2.5 - Battery Con-
trol for details.
When no internal contactor for automatic disconnection is installed in the UPS module, the external
battery disconnection is performed by fitting a Circuit Breaker Controller Board and an undervoltage
coil to the battery circuit breaker.
The circuit breaker can then be manually closed once the DC busbar is above the ‘low battery; trip
voltage. Once closed, the circuit breaker can be opened manually at any time and is tripped automat-
ically by the UPS module following certain fault occurrences, an emergency power off command or if
low/high DC busbar voltage is detected. Refer to 2.5 - Battery Control for details.
Table 8 Dimensions and weight
Model UPS Ratings
Rated Service
Current (In)
Rated
Uninterrupted
Current (IU)
External Cabinet
WxDxH, mm (in)
Cabinet Weight
Without Batteries,
kg (lb)
Narrow
Cabinet
30kVA
40kVA
60kVA
80kVA
125A
200A 160A
250A 828x825x1600
(32.6x32.4x63)
200 (441)
Wide
Cabinet
30kVA
40kVA
60kVA
80kVA
125A
200A 160A
250A 1490x825x1600
(58.7x32.4x63)
270 (595)
Large
Cabinet
100kVA
120kVA
140kVA
160kVA
200kVA
400A
500A 400A
500A 1490x825x1800
(58.7x32.4x76.9)
305 (672)