Encoder phase fault

What does E.EP mean?

This fault indicates an issue with the phase sequence or signal integrity of the encoder feedback connected to the FR-A800/A800 Plus Series drive. It signifies that the drive cannot properly interpret the motor's position or speed from the encoder, often due to incorrect wiring or a damaged encoder.

• Incorrect wiring or reversed phases of the encoder feedback signals (A, B, Z phases).
• Damaged encoder cable or loose connections at the drive or encoder end.
• Faulty encoder (e.g., internal damage, signal corruption, or contamination).
• Incorrect encoder type or resolution settings in the drive parameters.
• Excessive electrical noise interfering with the encoder signals.

Click steps to track your progress.

1. 1

   Verify the encoder wiring at both the FR-A800/A800 Plus Series drive and the encoder itself, ensuring correct phase connections (A, B, Z) and shield termination.

2. 2

   Inspect the encoder cable for any physical damage, breaks, or signs of insulation wear that could cause signal loss or cross-talk.

3. 3

   Check the encoder parameters in the FR-A800/A800 Plus Series drive, ensuring the correct encoder type, pulse count (resolution), and signal format are selected.

4. 4

   Use an oscilloscope to verify the integrity and correct phasing of the encoder A and B signals at the drive terminals while the motor is slowly rotated.

5. 5

   Ensure proper grounding and shielding practices are followed for the encoder cable to minimize electrical noise interference.