How do I fix and clear Mazak alarm 521?

Confirm the program scheme of the machining program. Clearing procedure: Tap alarm clear button.

NOTICEAlarm code

521

CANNOT LOAD (WRONG PROG TYPE)

Q: What does Mazak alarm 521 mean?

Mazak alarm 521 is "CANNOT LOAD (WRONG PROG TYPE)". The operator has attempted loading a machining program of a scheme different from the program scheme within the NC unit. Error type: Operation — wrong key or incorrect operation. Machine state: Operation continued — machine still running.

What it means

The operator has attempted loading a machining program of a scheme different from the program scheme within the NC unit.

What to do

1Confirm the program scheme of the machining program.

Codebook — decoded

AError typeOperation — wrong key or incorrect operation

LStop statusOperation continued — machine still running

SClearingTap alarm clear button

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

Still stuck? Ask the Mazatrol assistant →