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5.5 Electrical Specifications
RECTIFIER INPUT
Input Voltage
Standard voltages for 100 - 450kVA units: 208, 480 and 600VAC
Standard voltages for 500 - 1000kVA units: 480 and 600VAC
Other voltages available on request. 3-phase, 3-wire plus ground.
Voltage Range +10%, -15% (no battery discharge at -20%)
Frequency Range 57 Hz to 63 Hz
Subcycle Magnetization Inrush
Less than 3 times normal full load input current for UPS models without optional
input isolation transformer. Typically less than 8 times normal full load input current
for models with optional input isolation transformer and optional input filter.
Input Current Walk-In From 20% to 100% in 15-20 seconds
Current Limit Maximum of 125% normal full load input current
Current Distortion
Less than 30% reflected THD typical at normal full load input current. Less than 7%
reflected THD typical at normal full load input current with optional input filter.
For models with optional 12-pulse rectifier, less than 9% reflected THD typical at
normal full load input current. Less than 4% reflected THD typical with optional input
filter.
Power Factor
0.85 minimum lagging at full load
0.92 minimum lagging at full load with optional input filter
BYPASS INPUT
Input Voltage
Standard voltages - 208/120 VAC, 480/277 VAC, 600/346 VAC. 3-phase, 3-wire
plus ground or 3-phase, 4-wire plus ground. Other optional voltages available.
Optional voltages - 208 VAC, 480 VAC, 600 VAC. 3-phase, 3-wire plus ground
(ungrounded or corner grounded delta). Other optional voltages available.
Voltage Range
±5% for manually initiated bypass transfer
±10% for automatically initiated uninterrupted transfer
Frequency Range 59.5 Hz to 60.5 Hz
Voltage Transient ±4% for manually initiated bypass transfer
CRITICAL LOAD OUTPUT
Output Voltage
Standard voltages - 208/120 VAC, 480/277 VAC and 600/347 VAC. 3-phase, 3-wire
plus ground or 3-phase, 4-wire plus ground. Other optional voltages available.
Optional voltages - 208 VAC, 480 VAC, 600 VAC. 3-phase, 3-wire plus ground
(ungrounded or corner grounded delta). Other optional voltages available.
Voltage Regulation
±0.5% for balanced load
±2% for unbalanced load
Voltage Adjustment Range ±5% manually (front panel knob)
Line Drop Compensation Range Up to +5% automatic load dependent
Frequency 59.5 Hz to 60.5 Hz
Slew Rate 0.01 to 1 Hz per second adjustable
Phase Balancing
120° ±1° for balanced loads
120° ±3° for 50% unbalanced loads
Voltage Imbalance
20% Unbalanced Load
50% Unbalanced Load
±1% from the arithmetic average of the 3 phases
±2% from the arithmetic average of the 3 phases
Voltage Transient
20% Load Step
50% Load Step
100% Load Step
Loss or Return of AC Input Power
Manual Transfer of 100% Load
±4% RMS
±4% RMS for 100-750kVA units; ±5% RMS for 1000kVA units
±5% RMS for 100-750kVA units; ±8% RMS for 1000kVA units
±1% RMS
±4% RMS
Voltage Transient Recovery Time To within 1% of steady state output voltage within 50 milliseconds
Voltage Harmonic Content
Maximum 5% RMS total, for any combination of linear and nonlinear 3-phase loads
Maximum 3% RMS single, for linear loads
Overload at Full Output Voltage
104% of full load rating continuously
125% of full load rating for 10 minutes
150% of full load rating for 30 seconds
(with ±2% voltage regulation)
Fault Clearing
Up to 300% of normal full load current subcycle; up to 500% of normal full load
current for up to 40 milliseconds with bypass available; up to 1000% of normal full
load current for up to 16 milliseconds with bypass available.