AuE Auto-Tuning Error fault in delta drive

AuE Auto-Tuning Error fault in delta drive troubleshooting

Description

The AuE fault occurs exclusively during the motor parameter identification process (Auto-tuning). Modern Delta drives (C2000/MS300) utilize auto-tuning to measure the motor's resistance (R1), leakage inductance, and saturation curves to optimize Vector Control performance. The AuE fault signifies that the drive attempted this process but failed to complete it successfully, leading to invalid math calculations regarding the motor model.

Causes

1. Load Connected (Rotational Tuning): You selected "Rotational Auto-tuning" but left the gearbox, belt, or load connected to the motor shaft. The extra inertia prevents the motor from accelerating as the drive expects during the test.
2. Incorrect Data Entry: The user entered motor nameplate details (kW, Amps, Voltage, Poles) that are vastly different from what the drive detected physically. For example, entering a 4-pole motor as 2-pole.
3. Wiring Issues: High resistance in long motor cables or a loose connection causes the resistance measurement (R1) to fail.
4. Brake Engaged: The mechanical brake was not released, so the motor could not spin.

Solution

Steps to fix AuE:
1. Verify Wiring: Ensure motor cables are tight. If cables are extremely long (>50m), the resistance drop may confuse the tuner.
2. Check Motor Data: Go to Group 01 or Group 05 parameters and strictly verify that the Max Frequency, Base Frequency, Rated Voltage, and Rated Current match the motor nameplate exactly.
3. Select Correct Mode: If you cannot disconnect the load (belt/gearbox), do not use Rotational Tuning. Switch to "Static Auto-tuning" (usually Option 2). This tests the motor without spinning it.
4. Release Brake: If using Rotational tuning, ensure the brake is wired to open when the drive starts the test.