Liebert NX UPS System Power Supply User Manual


 
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.