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Why the voltage is appearing at output terminals of Altistart 48 Soft Starter without run command.

When the ATS48 is supplied by L1,L2 and L3 and there are no RUN command and/or no motor connected, you have a voltage on the output. This voltage is not able to start the motor.

The reason is there is a set of capacitors and resistors connected between Input Terminal (L1,L2,L3) and Output Terminal (T1, T2, T3) in parallel with thyristors. Even if there is no firing command the current flows through these capacitors and resistors.

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