Cause : Absolute encoder status error comes when the encoder detects an internal status error. After the control power on, the encoder rotates faster than the specified rate.

"alarm 47" in panasonic servo drive indicate "Absolute encoder status" error. This means a general issue with the absolute encoder's status, which could be related to a variety of potential problems including communication errors, power supply issues, or internal encoder faults.

Troubleshooting Steps:

1. Check Encoder Connections:

• Inspect Wiring: Ensure that all connections between the absolute encoder and the servo drive are secure and in good condition. Look for loose, damaged, or disconnected wires that could be causing communication issues.
• Connector Integrity: Check the connectors for bent pins, corrosion, or any other physical damage that could interfere with proper connection.

2. Inspect the Absolute Encoder:

• Physical Damage: Examine the absolute encoder for any signs of physical damage, such as cracks, wear, or other issues that could affect its operation.
• Signal Verification: If possible, use diagnostic tools to verify the signal integrity from the encoder to the drive. Ensure that the encoder is sending the correct position data and status signals.

3. Check Power Supply:

• Stable Voltage: Ensure that the encoder is receiving a stable and correct voltage. Power supply issues can cause the encoder to malfunction and generate status errors.
• Power Supply Connections: Verify that all power supply connections to the encoder and drive are secure and within specification.

4. Review Encoder and Drive Configuration:

• Parameter Settings: Check the servo drive parameters related to the absolute encoder. Ensure that they are configured correctly for the specific encoder being used, including settings for resolution, communication protocol, and encoder type.
• Reset Encoder Status: If possible, perform a reset or reinitialization of the encoder status through the drive's interface. This may clear any temporary status errors.

5. Firmware Updates:

• Update Firmware: Check for any available firmware updates for your servo drive that might address encoder status issues. Manufacturers often release updates to fix known bugs or improve compatibility with encoders.
• Reinstall Firmware: If no new firmware is available, consider reinstalling the current firmware to ensure it is not corrupted.

6. Environmental Factors:

• Vibration and Noise: Ensure that the encoder and its connections are not exposed to excessive vibration or electrical noise, which could interfere with communication and cause status errors.
• Temperature Stability: Check that the operating environment is within the specified temperature range for the encoder, as extreme temperatures can affect its functionality.

7. Perform a System Power Cycle:

• Restart the System: Power off the servo drive and then turn it back on to reset the system. Sometimes, a power cycle can resolve temporary errors related to the encoder status.
• Monitor System: After restarting, monitor the system to see if the alarm reoccurs, indicating a persistent issue.