Specifications and Technical Data

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

 

110% load, 60 min

Overload Capacity

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 1 2

 

208/220V 3-phase

Rated current

 

208V

252A

 

220V

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.

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Emerson 115-480, 115-120, 15-90KVA, 115-208, 115-50/60HZ, 115-600V user manual Inverter output to critical load, Bypass input
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115-600V, 115-208, 115-120, 115-50/60HZ, 115-480 specifications

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