bob ward
16th Apr 2017, 09:34 PM
PART 1
I have a 10yo Hafpos 240V vertical/horizontal mill, the vertical 1.5kw cap start cap run motor is causing concern.
Recently the vertical spindle decided not to cooperate when I switched it on, it would turn maybe a quarter turn and that was it. The motor hummed as per usual, there was nothing loud or unusual about the hum. For the heck of it I tried to run it anti-clockwise and it worked, yay! Turned the switch to clockwise and it worked, double yay, I'm back in business. That start up system worked for a few days and then inevitably the vertical spindle decided not to work in either direction.
I replaced the 35uf start cap. I tested the new cap prior to fitting and it showed 35uf, the removed cap was down to 15uf. So now the mill starts but I'm thinking there is still a problem lurking. When it starts, the spindle makes a couple of slow turns and then goes to full speed, before these problems the spindle, like my similarly motored lathe, always went instantly to full speed.
Is there anything I can fiddle with or should I just bite the bullet and go buy a new motor.
PART 2
I have 3ph at the shed, the thought is that as a step towards putting a vfd speed control on the vertical spindle I should replace the single phase motor with a 3 phase motor. Redoing the wiring is beyond my skills, but so that I can talk intelligently to a sparky I'd like to know in general terms what is involved in hooking up the 3 phase motor but still have everything (vertical 3ph motor, horizontal 1ph motor, light, pump, E stop) work through the existing switches. I'll worry about the vfd later on, I just want to do a fairly seamless motor swap at the moment.
I have a 10yo Hafpos 240V vertical/horizontal mill, the vertical 1.5kw cap start cap run motor is causing concern.
Recently the vertical spindle decided not to cooperate when I switched it on, it would turn maybe a quarter turn and that was it. The motor hummed as per usual, there was nothing loud or unusual about the hum. For the heck of it I tried to run it anti-clockwise and it worked, yay! Turned the switch to clockwise and it worked, double yay, I'm back in business. That start up system worked for a few days and then inevitably the vertical spindle decided not to work in either direction.
I replaced the 35uf start cap. I tested the new cap prior to fitting and it showed 35uf, the removed cap was down to 15uf. So now the mill starts but I'm thinking there is still a problem lurking. When it starts, the spindle makes a couple of slow turns and then goes to full speed, before these problems the spindle, like my similarly motored lathe, always went instantly to full speed.
Is there anything I can fiddle with or should I just bite the bullet and go buy a new motor.
PART 2
I have 3ph at the shed, the thought is that as a step towards putting a vfd speed control on the vertical spindle I should replace the single phase motor with a 3 phase motor. Redoing the wiring is beyond my skills, but so that I can talk intelligently to a sparky I'd like to know in general terms what is involved in hooking up the 3 phase motor but still have everything (vertical 3ph motor, horizontal 1ph motor, light, pump, E stop) work through the existing switches. I'll worry about the vfd later on, I just want to do a fairly seamless motor swap at the moment.