On 3/18/24 07:53, Todd Zuercher via Emc-users wrote:
Gene,
In all honesty I wouldn't mind knowing more about your VFD source you say you
want black listed. I'm so sick of trying to track down high speed VFDs that
I'm almost tempted to pay the machine manufacturer's ridiculous 3X normal
retail list price markup the next time we need a new one. We occasionally
have needed a replacement VFD capable of running about a 15kw 4pole router
spindle at up to 24krpm (that is 800hz output, most drives seem to max out at
or are limited to 500-600hz output.) The last time we tried to order a new
drive with these specs it was put on back order for more than 1 year before we
canceled the order. (We canceled after the delivery date had been pushed back
3 months for the 5th time.) Then we bought a used one off of ebay. (Tracking
down a used drive on ebay with documented proof of the correct high speed
firmware, when the sellers have no clue, is also another annoying trick to
perform.)
I bought a $79 eBay special VFD for my Bridgeport R2E3
retrofit. The entire programming sheet was one large sheet
of paper. I wanted to program torque boost at the low-end.
I could do that, but then the motor had an overcurrent at
full speed. There needed to be a breakpoint where the
torque boost faded out, but I couldn't figure out how to set
that. So, I finally broke down and spent more money on one
from Automation Direct. It came with a 90+ page book that
had all the parameters listed, and showed how they
interacted. Very good, clear and understandable.
There are arms controls on high frequency VFDs.
Jon
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