Auto-Tuning Fault

What does tnF mean?

This fault occurs during the auto-tuning process, signifying an incompatibility with the connected motor, such as a special motor type or incorrect power sizing relative to the drive. This prevents the drive from accurately optimizing its control parameters, leading to suboptimal performance.

• Motor nameplate data (Voltage, Current, RPM, kW/HP) entered into drive parameters (P0-03 to P0-06) does not match the actual motor.
• Special motor type (e.g., servo motor, permanent magnet motor) not supported by the drive's auto-tuning algorithm.
• Motor size (kW/HP) significantly mismatched with the drive's rated output power.
• Motor not physically connected or connections are loose/intermittent during the tuning process.
• Mechanical load connected during static auto-tuning, preventing accurate rotor resistance measurement.

Click steps to track your progress.

1. 1

   1. Verify all motor nameplate data (Voltage, Current, Frequency, RPM, kW/HP) is accurately entered into drive parameters (e.g., P0-03, P0-04, P0-05, P0-06).

2. 2

   2. Ensure motor U, V, W terminals are securely connected to the drive output.

3. 3

   3. Disconnect the motor from any mechanical load before initiating static auto-tuning.

4. 4

   4. Check motor winding continuity and resistance (U-V, V-W, W-U) with a multimeter; values should be balanced.

5. 5

   5. Confirm the motor type (e.g., induction, PMAC) is compatible with the drive's auto-tuning capabilities as per drive manual.