Specificationsand Ratings 121
CRITICAL LOAD OUTPUT
Output Voltage: Standardvoltages—208Y/120 VAC, 480Y/277 VAC, 600Y/346 VAC. Other
voltagesavailable on request.
SCCoutput: 3-phase, 3-wire plus ground or 3-phase, 4-wire plusground.
Moduleoutput to SCC: 3-phase, 4-wire plus ground (neutral required).
Optionalvoltages—208 VAC, 480 VAC, 600 VAC. Other optional voltages
availableon request. 3-phase, 3-wire plus ground (ungrounded or corner
groundeddelta).
Voltage Regulation: ±0.5%for balanced load.
±2%for unbalanced load.
Voltage Adjustment Range: ±5%manually.
Line Drop Compensation Range: Upto +5% automatic load dependent.
Frequency 59.5Hz to 60.5 Hz.
Slew Rate: 0.06Hz 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
Lossor Return of AC InputPower
ManualTransfer 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: Towithin 1% of steady state output voltage within 50 milliseconds.
Voltage Harmonic Content: Maximum 5% RMS total, for any combination of linearand nonlinear loads.
Maximum3% RMS single, for linear loads.
Module Overload Capacity at Full
Output Voltage:
(Systemoverload capacity depends
onthe 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.
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