Specifications

Liebert Nfinity UPS Guide Specification
4kVA –20kVA (208/120 or 240/120) 4/03 Rev 2
SL-23956
3
B. Voltage Regulation: +/- 3% steady state.
C. Frequency Regulation: 60 Hz, +/- 0.5%.
D. Frequency Slew Rate: field selectable from 0.5 to 5.0 Hz maximum per second.
E. Bypass Frequency Synchronization Range: field selectable from 0.5 to 5.0 Hz
maximum per second.
F. Voltage Distortion: 3% total harmonic distortion (THD) maximum into a 100% linear
load, 7% THD maximum into a 100% non-linear load with crest factor ratio of 3:1.
G. Load Power Factor Range: 0.5 lagging to 1.
H. Output Power Rating: Rated kVA at: 0.7 lagging power factor.
I. Overload Capability: >100% - 110% indefinitely, 111% -150% for 10 seconds, 151% -
200% for 0.25 seconds. The load will be transferred to bypass when any of the above
conditions are exceeded. >201% for min. 2 cycles, then shut down of UPS. Immediate
shutdown into a short circuit.
J. Voltage Transient Response: +/- 7% maximum for any load step up to and including
100% of the UPS rating.
K. Transient Recovery Time: To within 1% of steady state output voltage within 96
milliseconds.
1.3.3.4 Batteries
A. Internal Battery: The battery consists of flame retardant, valve regulated, lead acid
cells. The UPS is suitable for installation inside a computer room per requirements of UL
Standard 1778.
B. Reserve Time: The UPS contains internal battery system to provide a reserve time of 7
minutes at 100% load with an equal number of power and battery modules fitted. The
UPS includes provisions to fit additional battery modules internally if space permits. The
UPS also interfaces with an external battery cabinet to extend reserve time capabilities.
C. Battery Recharge: To prolong battery life, the UPS includes temperature-compensated
battery charging. When equal number of power modules and battery modules are fitted
the battery charger is able to recharge the internal batteries to 90% charge in six hours at
nominal input voltage and nominal ambient temperature.
1.4 ENVIRONMENTAL CONDITIONS
A. Ambient Temperature
Operating: UPS 0° C to +40° C; battery 20° C to 25° C for optimum performance.
Storage: UPS –20° C to +60° C; battery –20° C to 25° C for maximum 6 months.
B. Relative Humidity
Operating: 5 to 95% non-condensing.
Storage: 5 to 95% non-condensing.
C. Altitude
Operating: To 10,000 feet. Derating/reduced operating temperature range required for higher altitudes.
Storage: To 30,000 feet.
D. Audible Noise
Noise generated by the UPS during normal operation does not exceed 62 dBA measured at three feet
(one meter) from the surface of the UPS.
E. Electrostatic Discharge
The UPS is able to withstand a minimum 15 kV without damage and will not affect the critical load.