Cause : Absolute encoder single turn counter error comes when the encoder detects an error of the single-turn counter. The single-turn counter tracks the position within one full rotation of the encoder, and this alarm suggests that there may be a problem with how the encoder is counting or interpreting this data.

"alarm 44" in panasonic servo drive indicate "Absolute encoder single turn counter". This means an issue with the single-turn counter of the absolute encoder.

Troubleshooting Steps:

1. Check Encoder Connections:

• Inspect Wiring: Ensure that all connections between the absolute encoder and the servo drive are secure and undamaged. Loose or faulty connections can cause communication errors, leading to counter issues.
• Connector Integrity: Check the connectors for bent pins, corrosion, or any signs of wear that could disrupt the connection.

2. Inspect the Absolute Encoder:

• Physical Damage: Examine the encoder for any signs of physical damage or wear that could affect its operation, particularly related to the single-turn counting mechanism.
• Signal Integrity: If possible, use diagnostic tools to verify the signal integrity of the encoder and ensure it is accurately reporting position within a single turn.

3. Review Encoder and Drive Settings:

• Parameter Configuration: Ensure that the encoder settings within the servo drive are correctly configured for the specific type of absolute encoder being used. This includes ensuring the resolution and single-turn counter settings match the encoder's specifications.
• Reset Single-Turn Counter: If the drive allows, you may need to reset or reinitialize the single-turn counter to correct any errors in counting.

4. Check for Firmware Updates:

• Update Firmware: Look for any firmware updates for your servo drive that might address issues related to the absolute encoder's single-turn counter.
• Reinstall Firmware: If the firmware is already up to date, consider reinstalling it to ensure no corruptions are affecting the encoder system.

5. Perform a System Power Cycle:

• Restart the System: Sometimes, performing a power cycle (turning the system off and then back on) can clear temporary errors related to the single-turn counter.
• Monitor Performance: After restarting, monitor the system to see if the alarm reoccurs during operation.