Liebert Emerson NX UPS System - Manual (Page 83)

Technical Specifications
75
Table 34 Battery
Intermediate DC Circuit
Rated Power,
kVA
Unit of
Measurement 10 15 20 30
Battery Bus
Voltage
VDC
Nominal: 480V (VRLA Float charge is 540V)
Range: 400V - 616V
Number of Lead-Acid Cells
Nominal 240 = [40 x 6-cell (12V) blocks]
Maximum 264 = [44 x 6-cell (12V) blocks]
Float Voltage V/cell (VRLA)
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 or 30°C. or inhibit)
Ripple Voltage % V float ≤1
Ripple Current % C
10
≤5
Boost Voltage V/cell (VRLA)
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 timeout (selectable 8-30 hr)
- boost mode inhibit also selectable
End Of
Discharge
V/cell (VRLA)
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 *
max current
(adjustable) 1
kW 2.5 5 5 7.5
A 3.75 7.5 7.5 12
* At low input voltage the UPS recharge capability increases with load decrease (up to the maximum capacity indicated)
1. Max currents listed are for EOD voltage of 1.67 V/cell for 240 cells.
Table 35 Inverter output to critical load
Rated Power, kVA (kW)
Unit of
Measurement 10 (8) 15 (12) 20 (16) 30 (24)
Rated AC Voltage 1 VAC
380/400/415 V (three-phase, four-wire with neutral
referenced to the bypass neutral)
Frequency 2 Hz 50 / 60
Overload % Rated
110% for 60 min
125% for 10 min
150% for 1 min
>150% for 200 msec
Fault Current % Rated 340% current limitation for 200 msec
Non linear load capability 3 % Rated 100%
Neutral current capability % Rated 170%
Steady state voltage stability % ±1 (balanced load), ±2 (100% unbalanced load),
Transient voltage response 4 % ± 5
Total Harmonic Voltage
Distortion (THDV)
% < 1 (linear load), < 4 (non linear load 3 )
Synchronisation - Window Rated frequency ± 2Hz (selectable ± 0.5 to ± 3Hz)
Slew Rate (Max change rate
of synch frequency)
Hz sec
1 Hz/sec
selectable 0.1 to 3Hz/s (single UPS)
0.2Hz/sec (paralleled UPS)
Inverter Voltage Tolerance %V (AC) ±5
1. Factory set to 400V – 380 or 415V selectable by commissioning engineer.
2. Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Frequency converter operation also selectable.
3. EN 50091-3 (1.4.58) crest factor 3:1
4. IEC 62040-3 / EN 50091-3 also for 0-100-0% load transient. Transient recovery time: return to within 5% of steady state
output voltage within half a cycle.