On Sunday 20 August 2017 03:40:56 David Berndt wrote: > I'm having some issues commissioning my HY VFD. 4kw unit driving a 5hp > 3450rpm motor at 30hz max frequency (temporary 2 pole motor, 4 pole > motor is in the mail). Works great in "forward", but when it accels in > reverse it trips out and throws an E.OC.N error. Which appears to be > an over current error. > > I've flipped 2 leads to the motor, reversing the physical rotation and > it still works great in vfd "forward", proving that the motor and > mechanical aspects work in both directions. But the VFD does not. > Accel times are quite conservative/slow. Problem happens about 1 > second into acceleration. No clue.... There don't seem to be any > relevant settings. Problem happens regardless of control method, > modbus or operator panel. > > Unrelated, but wow, at low speeds this VFD seems to throw off a ton of > interference. The symptom I've noticed is that my usb mouse connected > to the PC in the control cabinet that also houses the VFD basically > gives up on life if the motor is running below 15hz. USB dongle modbus > was fairly impacted as well until I grounded the cable shield to the > pc case.
I had noise worse than the coaches megaphone, so I put a 20 amp rated Corcom brick wall in the AC line feed. Works a treat. > Just to make this slighlty more on topic. Is there a config somewhere > for maximum spindle RPM? With the drive configured correctly it won't > overspeed the motor, but it would be nice if the software was aware of > a top end for spindle speed as well. > What are you using for an interface between the pwm (or pdm) gen, I am assuming the pwmgen is in a mesa interface card?. I had been assured by the ebay critter that sold me the 1.5 hp vfd, hooked to a 1 horse 3 phase motor from a 30 yo compressor, that the analog input filtering was good and that I could feed the analog input (0 <-> 5 volt range, it has both 5 volt and 10 volt inputs) directly from the pwm generator, but I was unable to get good smooth control. My motor is a 4 pole, and at light load it has been spun north of 7K rpms. No damage if the internal fans don't throw blades, but because of motor winding inductance, current draw is well under an amp/phase so usable torque is an oxymoron, there isn't much. Practical limit for my setup is about 140hz. From 8hz to 140hz doesn't make me switch drive belts from 1st gear, no backgear. I had a mesa spinx-1 I had taken out of TLM because I was putting in a 40 lb supply and one of Jon's (Pico Systems pwm-servo amplifiers, great device BTW), so I pulled it out and hooked it up. Works Perfect. With a bit of tuning in the vfd, I can even do rigid tapping on the old grey Sheldon up to around 200-250 spindle rpms. Above that and the overshoot at reversal exceeds a full turn of the chuck. The spinx-1 needs separate fwd and rev signals, not a problem to hack that in your .hal file, but yell if you need some snippets of hal code, I might be able to help. > Thanks, > Dave Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
