motor driver error code 120

Error code 120 on a motor driver is a manufacturer-specific code that typically indicates an Overvoltage or Encoder/Communication issue. For Panasonic Minas series drivers, it is an Overvoltage Protection fault, often triggered during rapid deceleration when the motor acts as a generator. The fix involves increasing the deceleration time, checking for a disconnected or damaged Regenerative Resistor, and ensuring the input power supply voltage is within the rated range.