Applicable Systems
MINAS A5
MINAS A6
MINAS A5II
FP-X
FP7
Symptoms
The regenerative braking resistor is overloaded due to excessive regenerative energy dissipation. This occurs when the motor decelerates frequently with high inertia loads.
Possible Causes
- Regenerative resistor wattage rating is too small for the application
- Deceleration frequency is too high for the resistor's duty cycle
- No external regenerative resistor installed and internal resistor is insufficient
Troubleshooting Steps
- Step 1: Check the regenerative resistor specifications against the calculated regen energy
Resistor wattage rating meets or exceeds the calculated requirement - Step 2: Increase deceleration time to reduce peak regen energy
No overload with longer deceleration time - Step 3: Install a larger external regenerative braking resistor if needed
External resistor handles regen energy without overheating - Step 4: Reduce the frequency of deceleration cycles if possible
Regen duty cycle is within resistor specifications
How to Reset
To reset: 1) Allow the resistor to cool. 2) Cycle power OFF then ON. 3) Re-enable the servo. Install properly sized resistor before resetting.
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Source: Panasonic MINAS A5 Series Servo Drive Manual; Panasonic device FAQ (device.panasonic.cn)
Category: PLC & VFD
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