Emerson Liebert NX User Manual download pdf (Page 83)

Technical Specifications

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

≤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

(selectable 0.030-0.070)

- boost-float current trigger 0.010 C

(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

VAC

380/400/415 V (three-phase, four-wire with neutral

referenced to the bypass neutral)

Frequency

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

% Rated 100%

Neutral current capability % Rated 170%

Steady state voltage stability % ±1 (balanced load), ±2 (100% unbalanced load),

Transient voltage response

%± 5

Total Harmonic Voltage

Distortion (THDV)

% < 1 (linear load), < 4 (non linear load

)

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.

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Emerson Liebert NX User Manual Page 83

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