Does any one have the complete description of this alarm:It displays 201-4
Alarm. A sevo amp Z axis 2 A6
Machine is Okuma lathe LB 15 (1986) OSP 5000

Here is the pages from the book...Hope this helps
Jim

Thank's Jim for taking time to respond. now i'm sure there is a problem
in the servo amp.

I have same problem,
201-4 Alarm-A Servo Amp Z axis 4802A6
I used to turn off machine and alarm would go away.
Not anymore.
How did you fix your machine ?
Thanks
Javier

Have seen this alarm many times, usually this alarm is fatal to the drive unit. There is either a problem on the top board or the IBG modules on the lower base of the unit. There is a break down of the BDU / BLD unit in the maint. Manual. On check points to see if voltage is being sent to the top board.

Is this the BDU drive or has your machine been upgraded to the BLD drives? Are there LED's on the drive and if so, which ones are lit? If you have an IOCM or an IOCS lit, then you have to check the motor and cables with a megger to see if that is the cause of the overcurrent (IOCM = overcurrent in motor, IOCM = overcurrent in the servo amp). If you need further help, you can re-post here or contact me at: kevin@cnctechnicalservices.com