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What is the control voltage for the PST softstarter?

April 26, 2017CONTROL PST softstarter voltage

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What is the control voltage for the PST softstarter?

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The PST softstarter has three different voltages levels on it. The Three phase Motor voltage, the (120-220)Vac Supply voltage, and the 24Vdc control voltage. The 24Vdc can be supplied extenally by removing the jumper between terminal 8 & 9. Then put your Negative on Terminal 8 and and use the Positive as a signal to the Stop/Start terminals. • Q: Why does my softstarter have a fault for an SCR A: Possibility the the motor is coasting to a stop and the Regeneration voltage is induced back into the load side of the softstarter. Check the SCR’s without power to see if they are shorted.