Okuma Alarm A-8563 – Inverter Failure

Okuma Alarm A-8563 indicates a failure of the inverter system. This alarm appears when the control detects a fault in the Whetstone inverter or the dresser inverter. The inverter is responsible for controlling the motor speed and power, and when it does not respond correctly or reports an internal error, the machine stops the operation to prevent damage. The problem may be caused by an internal inverter fault, unstable power supply, communication problems with the control system, or damaged electronic components. Restarting the machine may sometimes clear the alarm, but if it appears again the inverter unit or related electronics usually need to be inspected or repaired.