Applicable Systems
MINAS A5
MINAS A6
MINAS A5II
FP-X
FP7
Symptoms
The communication between the servo motor encoder and the drive has been interrupted. The encoder signal is essential for closed-loop position and speed control.
Possible Causes
- Encoder cable is disconnected or has a broken wire
- Encoder connector is loose or has bent pins
- Encoder cable is damaged by bending, crushing, or chemical exposure
Troubleshooting Steps
- Step 1: Check the encoder cable connection at both the motor and drive ends
Connectors are fully seated and locked - Step 2: Inspect the encoder cable along its entire length for visible damage
Cable is intact with no cuts, kinks, or crushing - Step 3: If the cable appears OK, wiggle the connector while monitoring the drive status to identify intermittent connections
No intermittent communication drops - Step 4: Replace the encoder cable if damage is found or if intermittent issues persist
New cable maintains reliable communication
How to Reset
To reset: 1) Reconnect or replace the encoder cable. 2) Cycle power OFF then ON. 3) Re-enable the servo. Check parameter d22 (rEc) to verify communication is stable.
Frequently Asked Questions
- Q: What causes Err21.0 on Panasonic A5?
Encoder cable disconnection or damage. Check connector tightness and cable integrity. Use parameter d22.rEc to see communication error count.
Comments (0)
Share your experience to help others facing the same problem.
Leave a Comment
Source: Panasonic MINAS A5 Series Servo Drive Manual; Panasonic device FAQ (device.panasonic.cn)
Category: PLC & VFD
No comments yet. Be the first to share your experience!