Specifications
42
6.4 UPS Electrical Characteristics
6.4.1 Battery Manufacturers and Models
Either of two manufacturers’ batteries will be installed in the Liebert NX for 10-30 kVA 208V NX as
shipped. Below are the battery makers and the models they supply.
6.4.2 Input Rectifier
6.4.3 DC Intermediate Circuit
Table 10 Approved batteries
Battery Manufacturer Models Supplied
Enersys Yuasa NPX-80FR NPX-100FR NPX-150FR
C&D Dynasty UPS12-100FR UPS12-140FR -
Table 11 Rectifier input power
Rated Power 10kVA 15kVA 20kVA 30kVA
Rated Voltage, VAC 120/208
Supply 3-phase, 4-wire plus ground
Input Voltage Tolerance, VAC (without derating) 166-228
Frequency, Hz 50 / 60
Input Frequency Tolerance % ±10
Power Factor
≤ 0.99 at full load
≤ 0.95 at 50% load
Harmonic Current Less than 4% at full rated UPS output load
Rated Power (208V), kVA 10 15 20 30
Input Current,
1
Nominal, A 28 42 56 83
Output Current, Nominal, A 28 42 56 83
Notes
1. Overload capacity of input current: 100% Imax <I<125% Imax:
125% Imax <I<150% Imax:
I>150%:
10 min.
1 min.
Limits input current immediately
Table 12 DC intermediate circuit
Rated Power 10kVA 15kVA 20kVA 30kVA
Voltage range for inverter operation,
VDC
DC voltage is positive 210V and negative 210V for 200/208 input
and output in normal mode
NOTE: When the DC bus voltage is less than 190V between
positive and negative, the UPS will transfer to battery mode.
Recommended number of lead-acid batteries
Number of batteries is field-selectable from 20 to 24 jars (12V per
jar), or from 120 to 144 cells (2V per cell) when battery type is
VRLA. The unit is shipped with a nominal voltage of 324VDC.
Recommended float charge voltage 2.25VDC*
Recommended boost charge voltage 2.3VDC*
Recommended end of discharge voltage 1.65-1.8 VDC
Maximum recharge battery current, A 7.5 7.5 15 15
Maximum boost charge duration, min.* 1440
Boost-float threshold current, A* 0.1 C default
Temperature voltage compensation, mV/°C* 2
Ripple voltage superimposed % ≤ 1
* Set by configuration software
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