What does Mazak alarm 398 mean?

Mazak alarm 398 is "MOTOR&SERVO POWER OFF FAULT". The spindle winding changeover switch is OFF. Error type: Machine (PLC) — machine failure. Machine state: Emergency stop — machine fully stopped.

How do I fix and clear Mazak alarm 398?

1. Press the RESET key. 2. Turn the main power disconnect switch off and then back on. If the alarm message does not clear, then the winding changeover switch is faulty. Contact the nearest Mazak Technical Center or Technology Center. Clearing procedure: Fix cause → Power OFF → Power ON.

ALARMSMazatrol Assistant

CRITICALAlarm code

398

MOTOR&SERVO POWER OFF FAULT

What it means

The spindle winding changeover switch is OFF.

What to do

11.
2Press the RESET key.
32.
4Turn the main power disconnect switch off and then back on.
5If the alarm message does not clear, then the winding changeover switch is faulty.
6Contact the nearest Mazak Technical Center or Technology Center.

Codebook — decoded

FError typeMachine (PLC) — machine failure

HStop statusEmergency stop — machine fully stopped

NClearingFix cause → Power OFF → Power ON

Still faulted after these steps? Do not restart under load — ask the Mazatrol assistant.

Still stuck? Ask the Mazatrol assistant →