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Table 6 Electrical specifications
Liebert NXL Model Size 250 300 400
Input Parameters
Input Voltage to Rectifier, VAC 480V 3-phase, 3-wire
Input Voltage to Bypass, VAC 480V 3-phase, 3- or 4-wire
Permissible Input Voltage Range, VAC 70% to 110%
Input Frequency, Hz 60
Permissible Input Frequency Range, Hz 55 to 65
Input THDi at nominal voltage at full load, % <10% with 6-pulse and passive filter
Input Power Factor at nominal voltage >= 0.92
Flexi Power Walk-In, sec 3 to 30 (selectable) in 1 sec. Increments
Battery & DC Parameters
Battery Type
VRLA (Valve Regulated Lead Acid) or FLA
(Flooded Lead Acid)
Nominal Battery Bus, VDC 480V
Battery Float Voltage, VDC 540V
End-Cell Voltage, VDC 384 (for VRLA / FLA)
DC Ripple Voltage in float & Const V Ch.mode, % <1 (RMS value) < 3.4% Vpp
Temperature Compensated Battery Charging Standard (with temperature probe)
Output Parameters
Inverter Type IGBT-based Sine-Sine PWM Controlled
Output Power, kW 225 270 360
Output Voltage 480VAC, 3-ph, 4-w
Output Voltage Regulation, % < 1% (3-phase RMS average)
Output Voltage Regulation (100% Unb. Load) < 2% (3-phase RMS average)
Output Frequency, Hz 60
Output Frequency Regulation, % ± 0.1
Output THDu at Nominal Voltage (Linear Load), % <2%
Output THDu at nominal voltage Including a 100kVA Non Linear
Load per EN 62040-3, %
2.5% (max)
Capacity to Handle Step Load, % 0-100 or 100-0
Transient Recovery
(Linear Loads), %, msec within 5% peak to peak in one-line cycle
Capacity to Handle Leading PF Load Up to 0.8 with the following ratings:
a - 0.5 lag to 0.9 lag a - Subject to maximum kVA rating
b - 0.9 lag to Nom b - Subject to maximum kW rating
c - at 0.95 Lead c - Subject to maximum. kW rating
d - at 0.9 Lead
d - Subject to 12,5% kW derate or same rating
and 10°C temp. derate
e - at 0.8 Lead
e - Subject to 25% kW derate or 12,5% kW derate and
10°C Temp. Derate
Voltage Displacement, ° el 120° ±1° el (with 100% unbalanced load)
Compliance to
FCC Class-A Standard
Overload Conditions, % FL
110% for 60 minutes
125% for 10 minutes
150% for 1 minute