- Joined
- Mar 19, 2011
- Messages
- 940
I have my Rockwell mill 3-phase wired through a Hitachi VFD. Today, for the first time, I thought I would take the time to check machine rpm on the different pulleys at different settings on the pot.
The slower 4 pulleys worked fine, right through the range (max of about 1750 rpm.) But when I got to #5 (of 6), when I got about halfway through the range, the machine cut out and the VFD showed an error code. I reset it, and tried a couple more times. Same result.
I'm guessing that the machine is receiving the same amount of current; only the pulleys are different. So why might it be cutting out?
That having been said, I doubt that I would need much more speed unless I'm using 1/4" mills in aluminum. Still it would be nice to have a higher top end, just in case...
The slower 4 pulleys worked fine, right through the range (max of about 1750 rpm.) But when I got to #5 (of 6), when I got about halfway through the range, the machine cut out and the VFD showed an error code. I reset it, and tried a couple more times. Same result.
I'm guessing that the machine is receiving the same amount of current; only the pulleys are different. So why might it be cutting out?
That having been said, I doubt that I would need much more speed unless I'm using 1/4" mills in aluminum. Still it would be nice to have a higher top end, just in case...