Specifications

Liebert Nfinity UPS Guide Specification
4kVA –20kVA (208/120 or 240/120) 4/03 Rev 2
SL-23956
2
D. Automatic Restart - After a utility AC power outage and complete battery discharge, the UPS
will automatically restart and resume supplying power to the critical load. In addition, the battery
charger will automatically recharge the battery. This feature is enabled (factory default) and will
be capable of being disabled by the user. The user will also be able to program two auto restart
delay settings
1. Battery capacity % level
2. Countdown timer
E. Bypass - The bypass will provide an alternate path for power to the critical load and is capable of
operating in the following manner:
1. Automatic - In the event of an internal failure or should the inverter overload capacity
be exceeded, the UPS will perform an automatic transfer of the critical AC load from the
inverter to the bypass source.
2. Manual - Should the UPS need to be taken out of service for limited maintenance or
repair, manual activation of the bypass will cause an immediate transfer of the critical
AC load from the inverter to the bypass source. The input converter, inverter, and battery
charging operations will continue to operate, provided the control enable switch is in the
“On” position.
1.3.3 Performance Requirements
1.3.3.1 System
A. Configuration: UPS systems are configured or upgradeable to power ratings as follows:
12 Bay Frame Systems only
4 kVA system to 8, 12, 16, or 20kVA redundant system.
8 kVA system to 12, 16, or 20kVA redundant system.
12 kVA system to 16, or 20kVA redundant system.
B. Isolation: Input to output isolation is provided via the output transformer, regardless of
the operating mode. (UPS or bypass)
C. Remote Stop: The UPS provides provisions for remote stop (Emergency Power Off)
capability.
1.3.3.2 AC Input to UPS
A. Voltage Configuration: 208 or 240 VAC nominal (tap selectable), single-phase, 2-wire-
plus-ground. The operating voltage range is variable based upon output loading
percentages as follows:
% UPS Load
Input Voltage
80 – 100%
170 VAC
60 – 80%
144 VAC
30 – 60%
127 VAC
0 – 30%
110 VAC
B. Frequency: 40 to 70 Hz.
C. Input Current Distortion: 5% THD maximum at full load.
D. Input Power Factor: 0.98 lagging at 100% rated load.
E. Inrush Current: 150% of full load input current maximum for 3 cycles.
F. Surge Protection: Sustains input surges without damage per criteria listed in IEEE
C62.41, Category B.
1.3.3.3 AC Output
A. Voltage Configuration: 240/120 VAC, single-phase, 3 wire-plus-ground or 208/120
VAC single phase, 3 wire plus ground.