Stator Resistance Measurement Failed

What does 34 mean?

This fault indicates that the drive was unable to properly measure the motor's stator resistance, a crucial step for accurate motor control (especially in vector modes). This can be due to poor motor connections, a faulty motor, or an internal issue with the drive's measurement circuits. Inaccurate measurement will affect motor performance.

• Poor or intermittent connection between drive output terminals (U, V, W) and motor leads.
• High resistance in motor windings or cabling due to corrosion, loose terminals, or partial winding damage.
• Motor leads disconnected or motor not properly connected to the drive when auto-tuning is attempted.
• Small motor size (below typical range for drive) or very low inductance motor preventing accurate resistance measurement.
• Motor internal thermistor or sensor shorted or open, interfering with motor parameter detection during auto-tune.

Click steps to track your progress.

1. 1

   1. Power down the drive. Disconnect motor from drive output U, V, W. Measure resistance between motor phases (U-V, V-W, U-W) directly at the motor terminals using an ohmmeter (expected values typically 0.1 to 10 ohms).

2. 2

   2. Verify all motor cable connections at both the drive and motor ends are clean, tight, and free from corrosion.

3. 3

   3. Re-attempt the auto-tuning sequence (e.g., P1-20 set to 1 or 2) ensuring the motor is stationary and properly connected.

4. 4

   4. Ensure the motor's nameplate data (P1-01 through P1-07) has been accurately entered into the drive prior to auto-tuning.

5. 5

   5. If a motor line contactor is present, ensure it is closed and providing power to the motor during the auto-tune attempt.