A Capacitor Start Capacitor Run (CSCR) motor wired with a potential relay will have the start winding energized when the relay's contacts open.

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Multiple Choice

A Capacitor Start Capacitor Run (CSCR) motor wired with a potential relay will have the start winding energized when the relay's contacts open.

Capacitor Start Capacitor Run motors use a starting capacitor in series with the start winding to create a phase-shifted current that provides the initial torque. A potential relay senses the line conditions and uses a coil to operate contacts that connect or disconnect the start circuit. When power is applied, the relay pulls in and closes its contacts, energizing the start winding through the capacitor. As the motor speeds up, the current in the run winding falls due to back-EMF, the relay releases, and its contacts open, removing the start winding from the circuit. So the start winding is energized when the relay contacts are closed and is de-energized when they open.

Capacitor Start Capacitor Run motors use a starting capacitor in series with the start winding to create a phase-shifted current that provides the initial torque. A potential relay senses the line conditions and uses a coil to operate contacts that connect or disconnect the start circuit. When power is applied, the relay pulls in and closes its contacts, energizing the start winding through the capacitor. As the motor speeds up, the current in the run winding falls due to back-EMF, the relay releases, and its contacts open, removing the start winding from the circuit. So the start winding is energized when the relay contacts are closed and is de-energized when they open.

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