Input
• Voltage: 480 VAC, 60 Hz. 3-phase, 3-or 4-wire plus ground
• Voltage Range: +10, -15% (no battery discharge at -20%)
• Frequency Range: 60 Hz, ± 5 Hz
• Current Distortion: 10% maximum reflected THD at full load with optional input filter. 30% THD without filter.
• Current Limit: 115% of full load input current
• Current Walk-in: 20 seconds to full load.
• Power Factor: Up to 0.96 lagging at full load with optional input filter. 0.80 lagging minimum at full load without optional input filter.
• Surge Protection: Sustains input surges without damage,per criteria listed in ANSI C62.41-1980, A & B (IEEE 587).
Output
• Voltage: 480/277 VAC, 60 Hz, 3-phase, 4-wire plus ground.
• Voltage Adjustment Range: ±5%.
• Voltage Regulation: ±0.5% for balanced load ±1.0% for 100% unbalanced load.
• Dynamic Regulation: ± 2.5% deviation for 100% load step. ±1% for loss or return of AC input.
• Transient Response Time: Recover to steady state within 1 cycle.
• Voltage Distortion: For linear loads, 1% THD. Less than 2.5% THD for 100% nonlinear loads (3:1 crest factor) without kVA/kW derating.
• Phasing Balance: 120° ±0.5° for balanced load. 120° ±1° for 100% unbalanced load. Frequency Regulation: ±0.1%.
• Load Power Factor Range: 1.0 to 0.7 lagging without derating.
• Overload: 125% of full load for ten minutes. 150% for one minute with true sinusoidal waveform.
Environmental
• Operating Temperature: 0° to 40°C (UPS), 20° to 30°C (battery)
• Non-Operating Temperature: -20°C to 70°C.
• Relative Humidity: 0-95% non-condensing
• Operating Altitude: Up to 6,600 feet (2000 meters) without derating.
• Acoustical Noise: Less than 65 dBA typical, measured 1 meter from the unit.
Standards
• ETL Listed UL 1778 and UL 924 UPS standards, and CSA certified.
• Meets current requirements for safe high-performance UPS operation.
Standard Features
Like other Liebert UPS products, the Liebert Npower includes some features that are options (or not available) for some competitors:
• True double-conversion topology, for protection against 100% of power disturbances. Internal bypass switch enables you to isolate the UPS for maintenance.
• Continuous-duty static switch performs in pulsed-parallel mode for supplying fault current and momentary overloads, and can operate continuously for longer duration events. Internal output isolation transformer protects your critical load from common-mode noise and harmful DC offsets. In some configurations, it provides a separately derived source, to support 4-wire loads without having to pull a neutral line from the service entrance.
• Automatic input filter disconnect isolates the input filter capacitors at light loads to avoid presenting a leading power factor to the utility or backup generator.
• Backlit LCD graphic display enables easy navigation between the graphic mimic screen and the menu screens.
• Event Log can display up to 512 time-and-date-stamped alarm events
• Battery self-test helps verify the battery’s readiness to carry the critical load.
• Battery temperature-compensated charging prevents overcharging in high ambient operating temperature or undercharging
• Battery Cycle Monitor records up to 132 battery discharge events.
• Battery Time Remaining feature displays backup time remaining at present connected load.
• On-generator battery charge limit reduces recharge current until the utility AC power is restored
• Front-panel control of all configuration and field adjustment options simplify installation and maintenance
• Top-and-bottom cable entry gives the installer more options for equipment location.
• Two-hole bus bar landing space and accessible terminal blocks for options can simplify installation.
• Casters under the unit are helpful when a forklift is not readily available.
