Isthat 4hp per channel. My alen bradley vfd is, takes an age to wind up max rpm. I’ve got a 7.5hp to cure that
Haha i assume the contractors are for the limit switches/e stop if a cover is opened. how does that work with the vfd? That’s always confused me, makes e stops complicated. interested as my Harrison 140 had all the e stops and limit switches wired in sequence and one of them was bad but I couldn’t tell which. It needs rewiring really and I may put a VFD in there. I’ve got three phase already though so it would only be for slow speeds and the jog function really.
Mine's full of contactors*, and a VFD... If you're going to run the motor below about 30 Hz or so it's worth fitting an external fan for cooling, one of the contactors is for that - the ABB VFD I use (and many others) can have one of its relay outputs set to open/close with a "supervisory frequency", mine's set to OPEN above it when the motor's own fan is moving enough air, so it cools when stopped or running slowly. Reminds me to switch off, too A plus with the VFD is the braking/quick-reverse function, handy for tapping etc. - I added some hefty braking resistors from a nice Chinese gent on EvilBay. Dave H. (the other one) * Main incoming power (with big red mushroom labelled "PANIC" by the door); incoming power to lathe, power to spindle VFD; power to suds VFD; power to motor fan; power to low-voltage worklight; pair of small relays for suds "logic" flip-flop (suds button push on - push off); accessory feed...
You can continue to have them in series, but bring all the wires to a common point and then it is easy to test which one in the chain is bad. More wiring but much simpler troubleshooting.
Any chance you could share the 3D model of the bellows? Only for my own use. I was going to knock up a model based on the drawing of the original on the Harrison group, but why reinvent the wheel? I have a 3D printer, what TPU did you use? I currently have a steering gaiter in there, which works, but can some times spring the lever back to engagement, not ideal when you disengage near the chuck.
Got the Huanyang VFD wired up how I wanted - spindle brake for apron lever, coasting for foot brake. Took a little ingenuity with the VFD settings/features but seems to be working fine...fine that is after finding I was missing a VFD feature. Video here explaining all.
Yes no problem at 2500 (after I'd changed/tensioned the belts) though the braking (actually controlled deceleration) struggles and results in an over voltage error on the VFD - could be resolved by lengthening the ramp down or fitting a brake resistor.
I eventually got round to documenting my Huanyang VFD install featuring spindle brake. Photos of the install posted previously, schematic attached with plenty of notes and VFD parameter settings. Anyone considering this install should verify their VFD open collector outputs function per the video previously posted.
Nice little addition to the M300, a new old stock boxed Cutler Hammer 3 arm Lo-Vo Lite circa 1978 I believe.
