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Table 37 intermediate dc circuit, battery, Table 36, Intermediate dc circuit, battery – Emerson Liebert NX 50 and 60 Hz User Manual

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Technical Specifications

117

Table 37

Intermediate DC circuit, battery

Rated Power, kVA

Unit of

Measurement

30

40

60

80

100

120

140

160

200

Battery bus voltage

VDC

Nominal: 480V (VRLA Float charge is 540V)

Range: 400V ~ 600V

Quantity of lead-acid cells

Nominal

240 = [40 x 6-cell (12V) blocks]

Maximum

252 = [42 x 6-cell (12V) blocks]

Minimum

228 = [38 x 6-cell (12V) blocks]

Float Voltage (VRLA)

V/cell

2.25 V/cell (selectable from 2.2 –2.3V/cell)

Constant current and constant voltage (IU) charge mode

Temperature
compensation

mV/°C/cl

- 3.0 (selectable 0 to – 5.0 around 25°C [77°F] or 20°C [68°F]or inhibit)

Ripple Voltage

% V float

≤1

Ripple Current

1

% C

10

≤5

Boost Voltage (VRLA)

V/cell

2.35 V/cell (selectable from 2.30-2.40V/cell)

Constant current and constant voltage (IU) charge mode

Boost Control

- float-boost current trigger 0.050 C

10

(selectable 0.030-0.070)

- boost-float current trigger 0.010 C

10

(selectable 0.005-0.025) with

24 hr safety time-out (selectable 8-30 hr)

- boost mode inhibit also selectable

End Of Discharge (VRLA)

V/cell

1.63 V/cell (selectable from 1.60~1.75 V/cell

Auto Inverse EOD voltage x discharge current mode

(The end of discharge voltage increases at low discharge currents).

Battery Charge

V/cell

2.4 V/cell (selectable from 2.3-2.4V/cell)

Constant current and constant voltage (IU) charge mode

Programmable auto trigger or inhibit of boost mode

Battery Charging Power

2

kW

5.1

6.7

10

13

17

20

23.8

27.2

34

Max Current
(Adjustable)

3

A

13

17

25

33

43

50

60

68

85

1.

For a battery capacity of 24Ah or that corresponding to a rated back-up time of 10 minutes, whichever is greatest.

2.

At low input voltage the UPS recharge capability increases with load decrease (up to the maximum capacity indicated).

3.

Maximum currents listed are for end of discharge voltage of 1.67 V/cell for 240 cells.

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