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sunfar e380 speed oscillation
Posted: Wed Jun 16, 2021 8:58 pm
by skookem
many people had much experience with controlling this VFD I'm finding the manual and programming very hard I need to be of 3 or 4 pages at once . 50 pages apart
So after verifying the acorn is putting out the analogue signal that is scheduled using the mill bench test programme the VFD is still behaving badly the speed oscillates 20 % .I'm yet to find any dead band adjustment the VFD manual doesn't mean its not there .
I was thinking of trying reconfigure in PWM but i cant find any centroid material on doing this should I look to the laser set up documents ? Is this possibly an RF noise Issue ? I think the 0-10 wire wire runs in the bundle unshielded I can address that ..
I'm also finding the spindle is not starting during a programme it does start by MDI ..
Re: sunfar e380 speed oscillation
Posted: Wed Jun 16, 2021 9:22 pm
by skookem
I wonder if I should look at just using one of the relays like the vac or blower to switch on off the spindle its not a big deal to reach into the cabinet and adjust the speed now and then
Re: sunfar e380 speed oscillation
Posted: Wed Jun 16, 2021 9:49 pm
by Gary Campbell
There are numerous posts that show some vfd's require a .1 micro farad capacitor across the analog terminals
Re: sunfar e380 speed oscillation
Posted: Wed Jun 16, 2021 10:17 pm
by ShawnM
I agree with Gary, read the many posts about VFD and noise. There is an easy fix it just takes time to run down the problem. Shielded wire is a must in these noisy environments. Proper grounding is also a must and there are a few ways to go about this also. The .1 mfd cap also makes a big difference.
Controlling the VFD manually is so 1990's.
Re: sunfar e380 speed oscillation
Posted: Wed Jun 16, 2021 10:52 pm
by skookem
goin to shop getting the stuff and re running a shielded wire and + cap is likely to take me less time than searching and sifting through the posts based on how garbage i am and searching and sifting through posts this morning this morning . Thanks guys .. i ground the shield at the acorn end only ?
Re: sunfar e380 speed oscillation
Posted: Thu Jun 17, 2021 8:09 am
by ShawnM
The analog in signal wire is shielded as well as the wire used for the output to the spindle. You’ll have to experiment with which end of the shield/drain wire is grounded or both in some cases. There are various schools of thought on grounding and honesty they all work because sometimes which end to ground can be machine specific. In the end, proper shielding, grounding and the cap will solve your issues.
Re: sunfar e380 speed oscillation
Posted: Thu Jun 17, 2021 3:10 pm
by martyscncgarage
skookem wrote: ↑Wed Jun 16, 2021 8:58 pm
many people had much experience with controlling this VFD I'm finding the manual and programming very hard I need to be of 3 or 4 pages at once . 50 pages apart
So after verifying the acorn is putting out the analogue signal that is scheduled using the mill bench test programme the VFD is still behaving badly the speed oscillates 20 % .I'm yet to find any dead band adjustment the VFD manual doesn't mean its not there .
I was thinking of trying reconfigure in PWM but i cant find any centroid material on doing this should I look to the laser set up documents ? Is this possibly an RF noise Issue ? I think the 0-10 wire wire runs in the bundle unshielded I can address that ..
I'm also finding the spindle is not starting during a programme it does start by MDI ..
Can you clarify "Oscillates" You say the spindle speed is varying by up to 20%?
Never holds steady within a few RPM?
Take pictures/video of your setup and post.
Marty