What does Mazak alarm 387 mean?

Mazak alarm 387 is "TAIL DATA ILLEGAL". There are missing tailstock-related parameters. Error type: Registered Data — program or tool data error. Machine state: Feed hold — feed stopped, machine ready.

How do I fix and clear Mazak alarm 387?

Check the setting of RL52 (NC tailstock in-position width at pressing against workpiece) or RL62 (Maximum tailstock travel after pressing against workpiece). Clearing procedure: Fix cause → press RESET.

ALARMSMazatrol Assistant

CRITICALAlarm code

387

TAIL DATA ILLEGAL

What it means

There are missing tailstock-related parameters.

What to do

1Check the setting of RL52 (NC tailstock in-position width at pressing against workpiece) or RL62 (Maximum tailstock travel after pressing against workpiece).

Codebook — decoded

BError typeRegistered Data — program or tool data error

KStop statusFeed hold — feed stopped, machine ready

OClearingFix cause → press RESET

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

Still stuck? Ask the Mazatrol assistant →