As shown in the illustrated 3 phase synchronous motor controller, what statement is true regarding operation at synchronous speed? See illustration EL-0135.

Question

Accepted Answer

as the motor approaches synchronous speed the voltage induced across the rotor winding decays in amplitude and frequency causing the polarized frequency relay to drop out which energizes the field contactor, thus connecting the DC field across the field winding

Answer

as the motor approaches synchronous speed the voltage induced across the rotor winding increases in amplitude and frequency causing the polarized frequency relay to pick up which de-energizes the field contactor, thus disconnecting the DC field across the field winding

Answer

as the motor approaches synchronous speed the voltage induced across the rotor winding decays in amplitude and frequency causing the polarized frequency relay to pick up which de-energizes the field contactor, thus disconnecting the DC field across the field winding

Answer

as the motor approaches synchronous speed the voltage induced across the rotor winding increases in amplitude and frequency causing the polarized frequency relay to drop out which energizes the field contactor, thus connecting the DC field across the field winding

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