No motor

What does ALARM 3 mean?

No motor is connected to the output of the frequency converter. This prevents motor operation and could indicate a wiring issue or incorrect system setup.

• Motor not physically connected to the frequency converter's output terminals (U, V, W).
• Broken motor cable or loose connections between the frequency converter and the motor terminal box.
• Incorrect motor parameter settings, such as P1-03 (Motor kW) or P1-04 (Motor V), preventing motor recognition.
• Internal open circuit within the motor windings (e.g., one phase disconnected), preventing the frequency converter from detecting a load.
• Faulty current measurement circuit within the frequency converter itself.

Click steps to track your progress.

1. 1

   Visually inspect the motor cable connections at both the frequency converter output (U, V, W) and the motor terminal box.

2. 2

   Measure the resistance between the U, V, W output terminals of the frequency converter (with power off) to confirm motor winding continuity.

3. 3

   Verify motor nameplate data against frequency converter parameters P1-03 (Motor kW), P1-04 (Motor V), P1-05 (Motor A), P1-06 (Motor cos phi), P1-07 (Motor Speed).

4. 4

   Check for an open circuit within the motor windings by measuring resistance directly at the motor terminal box.

5. 5

   Perform an Automatic Motor Adaptation (AMA) via parameter P8-10 (Auto Adapt) to allow the frequency converter to characterize the connected motor.