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V4.1
MOTOR STARTING/OVERLOAD CAPABILITIES
All Phase Perfect digital phase convertors are rated to across the line start motors up to the
nameplate horsepower rating of the convertor except for 50 HP models and larger. Motor
starting capability is approximately equivalent to an across the line starter using a Class 10
thermal overload. This capability is accomplished using a Class 4 thermal overload
characteristic with a proprietary algorithm that limits inrush current on the manufactured leg
during startup to prevent nuisance tripping. During startup, voltage is folded back when
current exceeds 400% of Full Load Amps (FLA) of the converter. Below 400% of FLA, a
Class 4 thermal overload curve and thermal measurements, on the IGBTs, control overload
tripping.
1.0
10.0
100.0
1000.0
10000.0
0 50 100 150 200 250
Time (sec)
Current (A)
Overcurrent/Motor Starting Sourcing Limit
PTS003 PTS005
PT007/PTE007/PTS007 PT010/PTE010
PTE15 PT020/PTE020
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