Help Tearing my hair out.
My repairman says I have a contactor problem in my M5 Mazak Spindle Controller.
I can manually run the spindle in forward and at low speed and it is smooth. As I increase the speed it makes a racket like the motor is having a hard time running, and at about 450 to 500 rpm it gives me Alarms, 28 F EMERGENCY STOP, 51 THERMAL TRIP, 55 MOTOR OVERLOAD.
When I put it in reverse at zero rpm it is fine until I turn the spindle on then the same alarms.
I have disassembled the SA80 motor contactor cleaned and polished the contacts it made a little difference, the contacts were a little arced but cleaned up nice.
When I removed and checked the relay that controls the contactor field voltage it didn't work at first but when I wiggled it the motor worked intermittently and after cleaning the pins it worked a little smoother at first.
After I monkeyed with it and disassemble it and cleaned and sanded those contacts it did affect it but not fix it but as I moved it it affected the motor. I am going to interchange it for another relay on another machine tomorrow.
The vibration is only in the spindle motor intermittently when the spindle load meter oscillates up. The brushes are fine. The Tach brushes are fine. withe the belts removed everything turned smoothly.
Any ideas? I am not a guru and have no oscilloscope, tachometer or special equipment just a meter.
My repairman says I have a contactor problem in my M5 Mazak Spindle Controller.
I can manually run the spindle in forward and at low speed and it is smooth. As I increase the speed it makes a racket like the motor is having a hard time running, and at about 450 to 500 rpm it gives me Alarms, 28 F EMERGENCY STOP, 51 THERMAL TRIP, 55 MOTOR OVERLOAD.
When I put it in reverse at zero rpm it is fine until I turn the spindle on then the same alarms.
I have disassembled the SA80 motor contactor cleaned and polished the contacts it made a little difference, the contacts were a little arced but cleaned up nice.
When I removed and checked the relay that controls the contactor field voltage it didn't work at first but when I wiggled it the motor worked intermittently and after cleaning the pins it worked a little smoother at first.
After I monkeyed with it and disassemble it and cleaned and sanded those contacts it did affect it but not fix it but as I moved it it affected the motor. I am going to interchange it for another relay on another machine tomorrow.
The vibration is only in the spindle motor intermittently when the spindle load meter oscillates up. The brushes are fine. The Tach brushes are fine. withe the belts removed everything turned smoothly.
Any ideas? I am not a guru and have no oscilloscope, tachometer or special equipment just a meter.