ABB PST30 Installation And Commissioning Manual page 187

Status
PTC protection
Power on Fault Protection
Prot PTC
Reset
Thyristor overload protection The softstarter is too small.
Power on Fault Protection
Prot SCR OL
Reset Back
1SFC132003M0201
Possible cause
An over-temperature is detected
by the PTC thermistors in the
motor.
Back
Too many starts / hour.
The ramp time for start is too
long.
Solution
• 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.
Chapter 11
Trouble shooting
187