Current Calibration Fault

What does 3 mean?

This fault indicates a problem with the current calibration on one of the motor phases (T1/U, T2/V, or T3/W). This typically points to an issue with the motor connections or the motor itself, or an internal drive problem related to current measurement accuracy. Improper calibration can lead to inaccurate motor control.

• Loose or corroded motor output terminals (T1/U, T2/V, T3/W) causing inconsistent current measurements.
• Internal damage to the drive's current sensors (e.g., Hall effect sensors) on the power board.
• Phase-to-phase or phase-to-ground short circuit within the motor windings.
• Incorrect motor parameter entry (e.g., P0-03 Motor Rated Current) leading to miscalibration during setup.
• Incorrect connection of a single-phase motor to a three-phase output without appropriate configuration.

Click steps to track your progress.

1. 1

   1. De-energize and lock out the drive, then inspect all motor output terminals (T1/U, T2/V, T3/W) for secure connections and corrosion.

2. 2

   2. Disconnect the motor cables and measure the resistance between each phase terminal (U-V, V-W, W-U) at the drive output; verify resistances are balanced and match motor specifications.

3. 3

   3. Perform an insulation resistance test (Megger test) on the motor windings (phase-to-phase and phase-to-ground) at 500VDC to detect shorts or insulation breakdown.

4. 4

   4. Verify parameter P0-03 (Motor Rated Current) and P0-04 (Motor Rated Voltage) are correctly set according to the motor nameplate data.

5. 5

   5. Initiate an auto-tune procedure (e.g., parameter P0-05) if available, after ensuring motor parameters are accurate.

6. 6

   6. Replace the drive unit if all external connections and the motor test correctly and the fault persists.