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Ralspeed Motor Control System

Questions & Answers

Q5 THE SOFT STARTER TRIPS ON SHEARPIN FAULT

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Has the correct value of SHEARPIN been set

No
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 The Shearpin trip is an instantaneous over current trip. The user must set it high enough to avoid problems during ramp-up. The setting should be at least 100% above the current limit setting
Down Arrow Yes
    
Has the motor stalled?

Yes
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 If the ramp-up is set to VOLTAGE then the current is not limited. Therefore if the motor is stalled the current will rise to the SHEARPIN level and trip. Check and 'free' the motor
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Has the bypass contactor?

Yes
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 If the bypass contactor has jammed in, the start command will cause the starter to attempt a direct on line start which will generate 6/7 x FLC and the unit will trip on SHEARPIN fault.
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Is there a genuine over current condition?
Yes
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 If the motor is free it may be the load at fault causing the motor to stall. Check the load and 'free' if necessary.
Down ArrowNo
    
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