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Q: How do I wire a single-phase 3-wire motor if I don’t know the colours?

  • Step 1: Prepare for Measurement. Ensure the inverter is completely powered down and the motor is disconnected from the inverter. Set your multimeter to measure resistance (Ohms).
  • Step 2: Measure Resistance Between Pairs. Measure and record the Ohms between every combination of the three wires.
    • The largest Ohm reading is between the Start (Aux) and Run (Main) wires.
    • The middle Ohm reading is between the Start (Aux) and Common wires.
    • The lowest Ohm reading is between the Run (Main) and Common wires.
  • Step 3: Connect to Inverter. Standard Workhorse colours are Common = Black (U), Run = Blue (V), and Start = Brown (W).