Magnetic pole position unknown

What does E.MP mean?

This fault occurs in PM (Permanent Magnet) motor control modes with the FR-A800/A800 Plus Series drive, indicating that the drive is unable to determine the initial magnetic pole position of the motor. This is crucial for starting and controlling PM motors effectively.

• Incorrect PM motor parameters (e.g., motor type, number of poles, flux parameters) entered into the drive.
• Encoder feedback issue (if used for PM motor control) preventing accurate pole detection.
• Motor not connected, incorrectly wired to the drive, or an open phase in the motor windings.
• PM motor parameters not correctly identified through an auto-tuning procedure.
• Mechanical binding preventing the motor from moving slightly for pole detection during startup.

Click steps to track your progress.

1. 1

   Verify that all PM motor parameters (e.g., motor type, number of poles, flux parameters) are accurately entered from the motor nameplate and manual, and ensure they are correct for the FR-A800/A800 Plus Series drive's PM sensorless vector control mode.

2. 2

   Ensure the motor power cables are correctly connected to the FR-A800/A800 Plus Series drive's output terminals (U, V, W) and that no phase is open or shorted.

3. 3

   If an encoder is used with the PM motor, check its wiring and functionality for proper feedback.

4. 4

   Perform the magnetic pole position auto-tuning function (if available for the specific PM sensorless vector control mode) according to the FR-A800/A800 Plus Series manual.

5. 5

   Check for any mechanical binding or excessive resistance that might prevent the motor from making the small movements required for pole detection at startup.