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  • September 17, 2026

AC Motor Speed Controller Forward & Reverse Wiring Diagram

1: AC Motor Speed Controller Forward & Reverse Wiring Diagram

H2: Controller Terminal Layout

This AC speed controller features six terminals: COM, CW, CCW, AC (N), AC (L), and FG. The COM terminal 

must remain fixed and never be moved. The CW and CCW terminals control rotation direction—swapping 

them changes the motor from forward to reverse. The AC (N) and AC (L) terminals accept 220V AC power. 

The FG terminal is for ground connection and is optional.

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H3: Terminal Functions

  • COM: Common terminal (keep still)

  • CW: Forward rotation control

  • CCW: Reverse rotation control

  • AC (N): Neutral power input

  • AC (L): Live power input

  • FG: Ground wire (can be connected or not)

H2: Forward and Reverse Wiring Steps

  1. Connect the power cord to AC (N) and AC (L). For 220V AC, live and neutral are interchangeable.

  2. Keep COM fixed. Connect the control wire to CW for forward rotation.

  3. To reverse rotation, move the control wire from CW to CCW. The direction can be switched by swapping CW and CCW.

  4. Connect the ground wire to FG if required by local electrical codes.

  5. Verify all connections before powering on.

H2: Safety Notes

  • Disconnect power before wiring.

  • Do not move the COM terminal.

  • Ensure the controller matches the motor voltage and power.

  • Incorrect wiring may damage the motor or controller.

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