ABB PST Series Installation And Commissioning Manual page 166

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Power on Fault Protection
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166
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An over-temperature is detected
by the PTC thermistors in the
motor.
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Too many starts / hour.
The ramp time for start is too
long.
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• Check that the PTC circuit is closed and
that the inputs are connected.
• Check and correct the reason for the
overheating.
• Wait for the motor to cool sufficiently and
restart.
• Check and replace the softstarter with
one of a suitable size.
• Check and decrease number of starts /
hour.
• Check that current limit level is not set
too low.
• Check that the ramp time for start is not
too long.
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