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Specifications and Ratings 121
CRITICAL LOAD OUTPUT
Output Voltage: Standard voltages—208Y/120 VAC, 480Y/277 VAC, 600Y/346 VAC. Other
voltages available on request.
SCC output: 3
-phase, 3-wire plus ground or 3-phase, 4-wire plus ground.
Module output to SCC: 3
-phase, 4-wire plus ground (neutral required).
Optional voltages—208 VAC, 480 VAC, 600 VAC. Other optional voltages
available on request. 3
-phase, 3-wire plus ground (ungrounded or corner
grounded delta).
Voltage Regulation: ±0.5% for balanced load.
±2% for unbalanced load.
Voltage Adjustment Range: ±5% manually.
Line Drop Compensation Range: Up to +5% automatic load dependent.
Frequency 59.5 Hz to 60.5 Hz.
Slew Rate: 0.06 Hz per second.
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
30% Load Step
100% Load Step
Loss or Return of AC Input Power
Manual Transfer of 100% Load
±4% from the average peak voltage.
±5% from the average peak voltage.
±7% from the average peak voltage.
±1% from the average peak voltage.
±4% from the average peak voltage.
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 loads.
Maximum 3% RMS single, for linear loads.
Module Overload Capacity at Full
Output Voltage:
(System overload capacity depends
on the configuration of on-line
modules.)
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: 300% of normal full load current subcycle.
1000% of normal full load current up to 40 milliseconds with bypass available.