How do I fix and clear Mazak alarm 621?

Review the machining program and set the desired feedrate (FR).

CRITICALAlarm code

621

FEEDRATE ZERO (WNo., UNo., SNo.)

Q: What does Mazak alarm 621 mean?

Mazak alarm 621 is "FEEDRATE ZERO (WNo., UNo., SNo.)". Of tool sequence data (except for chip removal), the feedrate (FR) is unset or set to "0". Error type: Registered Data — program or tool data error.

What it means

Of tool sequence data (except for chip removal), the feedrate (FR) is unset or set to "0".

What to do

1Review the machining program and set the desired feedrate (FR).

Codebook — decoded

BError typeRegistered Data — program or tool data error

I (L)Stop statusunspecified

O (S)Clearingunspecified

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

Still stuck? Ask the Mazatrol assistant →