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Ralspeed Motor Control System

Questions & Answers

Q3 THE SOFT STARTER TRIPS ON FIRING FAULT

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Are any of the thyristor gate or cathode leads broken or loose?

Yes
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 The gate/cathode leads are connected at the factory so unless the user has disturbed them it is very unlikely that they will be incorrect. Therefore, a FIRING FAULT will only occur if one of these is loose or broken so a simple repair should suffice. See page 2.11 of the manual.
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Are the thyristor gate impedances as per the test certificates?

No
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 It is possible that there is a faulty thyristor. Replace the thyristor and try a restart.
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Is the motor connected correctly?

No
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 Make sure that the motor links in the terminal box are correct. Check the voltage of the motor.
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Is the motor undersized for the soft starter?
Yes
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 If the motor is not 'matched' to the soft starter it is possible that the motor impedance is too large and does not allow enough current to flow to enable the thyristor to latch.
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