Panasonic MINAS A5 Servo Drive Error Err21.0

Panasonic PLC & VFD Critical Feedback

Model: MINAS A5 | Code: Err21.0

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

  1. Step 1: Check the encoder cable connection at both the motor and drive ends
    Connectors are fully seated and locked
  2. Step 2: Inspect the encoder cable along its entire length for visible damage
    Cable is intact with no cuts, kinks, or crushing
  3. Step 3: If the cable appears OK, wiggle the connector while monitoring the drive status to identify intermittent connections
    No intermittent communication drops
  4. 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.

Related Panasonic Fault Codes

Source: Panasonic MINAS A5 Series Servo Drive Manual; Panasonic device FAQ (device.panasonic.cn)

Category: PLC & VFD