Panasonic MINAS A5 Servo Drive Error Err12.0

Panasonic PLC & VFD Critical Power

Model: MINAS A5 | Code: Err12.0

Applicable Systems
MINAS A5 MINAS A6 MINAS A5II FP-X FP7

Symptoms

The DC bus voltage inside the servo drive has exceeded the overvoltage protection threshold. This typically occurs during motor deceleration when regenerative energy is fed back to the drive.

Possible Causes

  • Regenerative energy from motor deceleration exceeds the braking resistor capacity
  • No regenerative braking resistor installed or resistor is damaged
  • Power supply voltage is too high
  • Deceleration time is set too short for the load inertia

Troubleshooting Steps

  1. Step 1: Check if a regenerative braking resistor is installed and properly connected
    Resistor is installed with correct resistance and wattage rating
  2. Step 2: Measure the power supply voltage to confirm it is within the rated range
    Voltage is within the rated range
  3. Step 3: Increase the deceleration time parameter to reduce regenerative energy
    No overvoltage alarm with longer deceleration time
  4. Step 4: If the problem persists, install a larger braking resistor or external regen unit
    Regen energy is safely dissipated without overvoltage

How to Reset

To reset: 1) Turn off the main power and wait for the display to go blank. 2) Turn the power back on. 3) Re-enable the servo. Ensure the regen resistor is properly sized before resetting.

Frequently Asked Questions

  • Q: Why does my Panasonic A5 keep showing Err12.0?

    Likely caused by insufficient braking resistor capacity or too-short deceleration time. Install or upgrade the regen resistor, or increase deceleration time.

Related Panasonic Fault Codes

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

Category: PLC & VFD