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27th Oct 2014, 09:40 PM #16Member: Blue and white apron brigade
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28th Oct 2014, 12:00 AM #17Most Valued Member
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28th Oct 2014, 06:58 PM #18Most Valued Member
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lol Well PD071 works...... sort of, it effects the speed the set freq on the display changes lol(granted not much use to you)
Based on my testing, I'm guessing you can increase the freq without tripping the VSD, its when you try and reduce freq it trips? Try making PD015 longer. (if you haven't already)
Stuart
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29th Oct 2014, 12:51 PM #19Member: Blue and white apron brigade
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Your guess is correct. I can increase the frequency without any probs, its reducing the frequency that is a prob. I can reduce it but only very slowly.
Changing PD015 changes the deceleration time when it is turned off but does not affect the rate of change of frequency when it is changed manually.
I'm letting the grinder coast to a stop as any deceleration from 50Hz has a prob.
The error is an OU-2 - recommends fitting a braking resistor - will have a read back thru these forums I think Joe did one one at some stage.
I really like having the manual frequency control because a small change in frequency can be used to reduce any residual grinder vibe. Say I'm running at 30Hz and there is a small vibe, then running either side of that at say 28 or 32Hz it becomes much smoother.
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29th Oct 2014, 01:33 PM #20Most Valued Member
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You tried this? (you're going to need PD015 the same as 14. or more I would guess) Now technically I didnt test PD015. I tested PD014 and it does* effect rate of change of frequency when it is changed manually. I assumed PD015 would also....... I'll test again shortly and see if I can come up with something that's actually useful.
Stuart
*on my VSD with my settings at least
p.s. Joe has a beauty of a braking resistor on his mill
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29th Oct 2014, 04:16 PM #21Most Valued Member
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Well it works on mine
The set up I have on this VSD is a little different to most. Its the one on the hoist, so is set to go from -35Hz to +40Hz on the pot. Coasting stop.
I replaced the 10 turn pot with a standard one allowing me to change from full fwd to full rev in something than a second.
With PD014=2 PD015=4 it takes about 4.3 seconds for the VSD to go from +40 to -35.
With PD014=2 PD015=14 it's about 13.3 seconds.(with the extra time being in the ramp down of course)
If its not working on yours maybe you have one of the other ramps selected some how?(I'd just try changing them all)
Stuart
P.S. once you have this ramp set long enough you should be able to go back to "decelerating stop" if you wish.
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29th Oct 2014, 04:41 PM #22Member: Blue and white apron brigade
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Yay it works!
What I had was the acceleration set 10 secs (the was OK) and the deceleration was 10s (not OK).
I set the I deceleration to 30 and all is
Now I need to explore how close to 10s I can go on the deceleration.
Thanks for persisting with me.
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30th Oct 2014, 11:16 PM #23Member: Blue and white apron brigade
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I was very occasionally having similar probs with my 1m x 150 mm linisher and I applied the same solution (longer decollation time) and its fixed!!!!
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1st Nov 2014, 06:43 PM #24Member: Blue and white apron brigade
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Finally finished the tool posts.
I also made a wheel guard.
It's a steel wheel so it not exactly going to come apart - I just wanted to reduce the risk of something hitting the CBN coating.
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28th Nov 2014, 05:58 PM #25
Very clever how you have connected the end rest off the original rest post.
…..Live a Quiet Life & Work with your Hands
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28th Nov 2014, 07:51 PM #26Member: Blue and white apron brigade
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28th Nov 2014, 07:58 PM #27
No the one you made that goes around the side
…..Live a Quiet Life & Work with your Hands
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28th Nov 2014, 10:07 PM #28Member: Blue and white apron brigade
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1) is a replica of the original 19mm diameter tool post holder
2) is a 40 mm diameter elbow that connects to 1) via an 8mm grub screw - just visible under the red number 2
3) is connected to 2) via a short length of 19 mm rod
5) is connected to 2) via an 8 mm grip screw on the front flat face of 2)
5) is connected to 3) just like 1) is connected to the front tool post - via a bolt from underneath
I hope that helps.
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