GBeaman
Hot Rolled
- Joined
- Jun 13, 2006
- Location
- Marble Falls, TX
My trusty Makino failed yesterday. I am getting this alarm 401 SERVO ALARM: (VRDY OFF)
I spent the afternoon evening trying to narrow down the problem. The machine will fire up and run until something warms up and then it shuts down (no more then 10 minutes of up time). It can cool for a period of time (30 minutes) and then will likely run another 5minutes before faulting out again. There are no other lights or errors on the drives, and I have turned off the servo driven tool changer in the parameters for the purpose of trouble shooting and eliminating its drive as the problem.
These are Fanuc OMc controlled AC red cap motors (1992). The servo drive for the XYZ axis is all combined into one unit with a top board. I have removed the top board and found the MCC contactors in the drive. I pulled the cover off of them and sprayed freeze it on them to see if maybe a coil was going bad in the MCC contactor itself, to no avail. When warm and the error is reset the MCC contactors pull in momentarily and the DRDY led is lit on the drive, and then it drops back out.
I need to form a plan of action. I guess that a Servo motor itself could be the problem, or the drive unit. If it is the drive unit MetalTech recommended Redrive services for another issue. I am thinking of pulling it and sending it to them for further evaluation. However, if I am wrong, I may turn a simple repair into a much larger ordeal. Any help or pointers to get closer to the cause of the problem would be helpful. Thanks.
Also, if anyone knows of a trust worthy technician in the central Texas area, I would love to find a contact.
-Greg
I spent the afternoon evening trying to narrow down the problem. The machine will fire up and run until something warms up and then it shuts down (no more then 10 minutes of up time). It can cool for a period of time (30 minutes) and then will likely run another 5minutes before faulting out again. There are no other lights or errors on the drives, and I have turned off the servo driven tool changer in the parameters for the purpose of trouble shooting and eliminating its drive as the problem.
These are Fanuc OMc controlled AC red cap motors (1992). The servo drive for the XYZ axis is all combined into one unit with a top board. I have removed the top board and found the MCC contactors in the drive. I pulled the cover off of them and sprayed freeze it on them to see if maybe a coil was going bad in the MCC contactor itself, to no avail. When warm and the error is reset the MCC contactors pull in momentarily and the DRDY led is lit on the drive, and then it drops back out.
I need to form a plan of action. I guess that a Servo motor itself could be the problem, or the drive unit. If it is the drive unit MetalTech recommended Redrive services for another issue. I am thinking of pulling it and sending it to them for further evaluation. However, if I am wrong, I may turn a simple repair into a much larger ordeal. Any help or pointers to get closer to the cause of the problem would be helpful. Thanks.
Also, if anyone knows of a trust worthy technician in the central Texas area, I would love to find a contact.
-Greg