An interlock on a reversing motor prevents two of the three phases from shorting by doing what?

An interlock on a reversing motor prevents two of the three phases from shorting by doing what?

• A. Preventing the opposite coil from shutting it's contacts when a coil is energized.
• B. Shorting the opposite coil when a coil is energized
• C. Reversing the rotation automatically
• D. Disconnecting all coils when one is energized

Answer: (A)

Interlocks in a reversing motor are there to prevent a dangerous phase-to-phase short by ensuring only one directional coil can be energized at a time. It does this by blocking the opposite coil from closing its contacts when a coil is energized. In practice, a normally closed contact (or a mechanical link) in the opposite coil’s control circuit holds that coil inactive as soon as the other coil is energized, so the forward and reverse contactors cannot both close. This keeps the motor from tying two supply phases together and protects the wiring and motor from damage.

Interlocks in a reversing motor are there to prevent a dangerous phase-to-phase short by ensuring only one directional coil can be energized at a time. It does this by blocking the opposite coil from closing its contacts when a coil is energized. In practice, a normally closed contact (or a mechanical link) in the opposite coil’s control circuit holds that coil inactive as soon as the other coil is energized, so the forward and reverse contactors cannot both close. This keeps the motor from tying two supply phases together and protects the wiring and motor from damage.