hi everyone
in my vmc4020 spindle motor , i have
increasing and decreasing rpm!
in low speed gear only
I don't have a problem when the spindle turns on at a speed higher than 2500, but this problem occurs when the speed is lower than 2500 when the spindle motor has more torque and speed.
And the current protector shows that the motor is use too much current
i checked vfd and swap with other vmc 4020 and i check encoder
spindle rotates very smoothly
i checked 3 wires and 2 ohm resistant together and 2 megaohm to motor body