What does Mazak alarm 121 mean?

Mazak alarm 121 is "SP ROT. FLUCT. ACCEL. CLAMP". The spindle speed acceleration was clamped while the spindle speed fluctuation function was enabled. Error type: Registered Data — program or tool data error. Machine state: Operation continued — machine still running.

How do I fix and clear Mazak alarm 121?

Review the cycle and amplitude of the fluctuation. Clearing procedure: Press RESET to clear.

ALARMSMazatrol Assistant

NOTICEAlarm code

121

SP ROT. FLUCT. ACCEL. CLAMP

What it means

The spindle speed acceleration was clamped while the spindle speed fluctuation function was enabled.

What to do

1Review the cycle and amplitude of the fluctuation.

Codebook — decoded

BError typeRegistered Data — program or tool data error

LStop statusOperation continued — machine still running

PClearingPress RESET to clear

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

Still stuck? Ask the Mazatrol assistant →