Emerson Liebert NX 50 and 60 Hz - Manual (Page 129)

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.