Atn (Atn1, Atn2, Atn3)Â Auto-Tuning Error fault in Toshiba drive
Atn (Atn1, Atn2, Atn3) Auto-Tuning Error fault in Toshiba drive
Description This fault appears during the commissioning phase when performing an "Auto-Tune." Auto-tuning is when the drive injects current into the motor to measure resistance, inductance, and leakage to build a mathematical model for precise control (Vector Control). The fault means the drive failed to complete this measurement cycle. It is not a hardware failure of the drive, but a procedure failure. Causes
1. Motor Connected to Load: Rotational auto-tuning was attempted while the motor was connected to a heavy load or a gearbox with high friction.
2. Circuit Open: The motor disconnect switch is open, or a wire is loose during the tune.
3. Mismatch: The motor size entered in the parameters is drastically different from the connected motor (e.g., programming a 10HP drive for a 1HP motor).
4. Hot Motor: Tuning was attempted on a motor that is already very hot, changing its resistance values outside expected limits. Solution First, ensure the basic nameplate data is entered correctly (Voltage, Frequency, Amps, RPM, kW/HP). If these are wrong, the tuning math will fail.
If performing a "Rotational Tune," you must uncouple the motor shaft from the load (remove belts/coupling). If uncoupling is impossible, switch the tuning mode to "Stationary Tune" (or "Static Tune"). This tests the electrical characteristics without spinning the shaft. It is slightly less accurate for vector control but prevents Atn errors on coupled loads.
Check the wiring between the drive and motor. If there is a reactor or filter between the drive and motor, it will distort the tuning signal. Bypass any output reactors during the tuning process, then reconnect them afterward. Finally, ensure the motor is at ambient temperature; if the motor was just running at full load, let it cool down before tuning.
Description This fault appears during the commissioning phase when performing an "Auto-Tune." Auto-tuning is when the drive injects current into the motor to measure resistance, inductance, and leakage to build a mathematical model for precise control (Vector Control). The fault means the drive failed to complete this measurement cycle. It is not a hardware failure of the drive, but a procedure failure. Causes
1. Motor Connected to Load: Rotational auto-tuning was attempted while the motor was connected to a heavy load or a gearbox with high friction.
2. Circuit Open: The motor disconnect switch is open, or a wire is loose during the tune.
3. Mismatch: The motor size entered in the parameters is drastically different from the connected motor (e.g., programming a 10HP drive for a 1HP motor).
4. Hot Motor: Tuning was attempted on a motor that is already very hot, changing its resistance values outside expected limits. Solution First, ensure the basic nameplate data is entered correctly (Voltage, Frequency, Amps, RPM, kW/HP). If these are wrong, the tuning math will fail.
If performing a "Rotational Tune," you must uncouple the motor shaft from the load (remove belts/coupling). If uncoupling is impossible, switch the tuning mode to "Stationary Tune" (or "Static Tune"). This tests the electrical characteristics without spinning the shaft. It is slightly less accurate for vector control but prevents Atn errors on coupled loads.
Check the wiring between the drive and motor. If there is a reactor or filter between the drive and motor, it will distort the tuning signal. Bypass any output reactors during the tuning process, then reconnect them afterward. Finally, ensure the motor is at ambient temperature; if the motor was just running at full load, let it cool down before tuning.
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