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Table 49 Inverter output to critical load
Parameter 15 - 90kVA
Rated AC Voltage
1
208/120, 220/127VAC, 60Hz, 3-phase, 3- or 4-wire plus ground
Frequency
2
60Hz
Overload Capacity
110% load, 60 min
125% load, 10 min
150% load, 60 sec
Fault Current Short circuit for 200 ms
Non-Linear Load Capability
3
100%
Neutral Current Capability 170%
Steady State Voltage Stability ±1% (balanced load)
Voltage Regulation
±1% for balanced load
±5% for 100% unbalanced load
Phase Balance
120° ±1° for balanced load
120° ±15°± for 100 unbalanced load
Transient Voltage Response
4
±5%
THD < 1% (linear load), <4% (non linear load
3
)
Sync Frequency Range Rated frequency ± 2Hz (selectable ± 0.5 to ± 3Hz)
Frequency Slew Rate 0.2 to 3Hz/sec
Frequency Regulation
±0.1% (single Liebert FlexPower Assembly)
±0.25% (six Liebert FlexPower Assemblies)
Voltage Adjustment Range ±5%
1. Factory set to 208V or 220V selectable by commissioning engineer.
2. Factory set to 60Hz; 50Hz selectable by commissioning engineer. Frequency converter operation also selectable.
3. EN50091-3 (1.4.58) crest factor: 3:1
4. IEC62040-3/ EN 50091-3 also for 0-100-0% load transient. Transient recovery time: return to within 5% of steady state output voltage
within half a cycle.
5. Three-phase, 4 wire and shared neutral with the bypass input.
Table 50 Bypass input
Parameter 15 - 90kVA
Rated AC Voltage
12
208/220V 3-phase
Rated current
208V
220V
252A
240A
Overload
135% load, long term
Upstream protection, bypass line
Thermomagnetic circuit-breaker, rated up to 125% of nominal output
current. IEC 60947-2 curve C.
Current rating of neutral cable, A
1.7×In
Frequency, Hz
60
Transfer time between Bypass and Inverter, ms
Synchronous transfer: 0ms
Asynchronous transfer (default): 15 ms (50 Hz), 13.3 ms (60 Hz)
or 40, 60, 80, 100 ms selectable
Bypass voltage tolerance,%VAC
Upper limit: +10, +15 or +20, default +15
Lower limit: -10, -20, -30 or -40; default: -20 (delay time to accept steady
bypass voltage: 10 sec)
Bypass frequency tolerance,%
±10 or ±20; default ±10
Synchronization - Window
Rated frequency ± 2Hz (selectable ± 0.5 to ± 3Hz)
1. Factory-set to 208 or 220V selectable by commissioning engineer.
2. Three-phase, 4 wire and shared neutral with the rectifier input. Neutral referenced to the output.