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Post by paulg100 on Jan 27, 2016 20:30:42 GMT
OK some kind of progress although not sure exactly what is going on..
When i switch on VFD 1 , both 24v a/b outputs on amc go to 24+ volts and f001 (the frequency reading) jumps to 14000 and skits around.. but no movement on motor.
So i tried VFD 3 that has a pot wired to it. when i turn this one on A goes to 24+volts, B is 0 until i press a direction button for a few moments and the motor comes to life and starts rotating continuously on its own. when i press a direction it turns in that direction until i let the button go and then continues rotating on its own again.
Am i correct in saying all AB's should read 0 volts until i press direction? if so why is the amc outputting continuous +24 voltage on its own when i turn on the vfd. Its as if the AB's are cancelling each other out preventing the motor from running.
The VFD's that only have a OR b outputting continuous seem to partially work.
I dont have an a/b group that has both a/b at 0volts until i press a direction. they are either both 24+ or some are a on b off or visa versa.
Could this be an interference or noise issue or maybe even bad pots?
Hope this is clear to follow, its a bit confusing.
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Post by tronicgr on Jan 27, 2016 20:45:08 GMT
The outputs A and B relay on the position sensor. The only time they are both off is when the position sensor reports back that the target position was reached.
Now, since you don't have the sensor attached on the motor, its open loop, that means it works like speed control only.
The point here is just to test if you can set the speed (with the pot) and direction (by enabling each input of the VFD inverter). Is that working right?
Thanks Thanos
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Post by tronicgr on Jan 27, 2016 20:50:40 GMT
Ok I read again your post...
Attach a sensor on the AMC1280USB analog input and position it manually in the middle (50%). The motor should not rotate.
Then press the direction buttons on the amc1280usb and it should move to cw or CCW direction( open loop).
If the above work fine, then you attach the sensor mechanically on the motor axle to measure position (Closed loop).
Thanks Thanos
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Post by paulg100 on Jan 27, 2016 21:17:31 GMT
BINGO!! yes it was the sensor set up jeepers so much time spent poring over the manual and vfd settings and it wasnt the problem after all, at least i know the settings on the WJ200's pretty well now i guess. thanks Thanos, now i can start making progress again.. (dont worry Michael i am keeping all these settings for you , ill post a complete list of them when i confirm everything is functioning right)
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Post by mhensen on Jan 27, 2016 21:38:38 GMT
Now that is good news.. (in both ways :-).. You have it moving... Now I am getting mor and more excited!!!
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Post by mhensen on Jan 27, 2016 21:47:16 GMT
OK so having each motor on its own movable mount gives some more flexibility in placement and modification later, but one problem is it was making it tricky to line everything up. So i had some wood in the garage and knocked up a quick jig to align the motors to correct distance and angles. Made it really quick and easy. The shafts in these motors have an m12 thread at the end so just bolted jig to each shaft and voila. You are clamping the motor on the 'rails'.. or how you might describe it .. Aren't you worried the motor will slip to the outside? Thinking of the same principle instead of bolting it through the rails... or perhaps of a slice of rubber, bicycle tube, between the crossbars and rails.. I see the advantages of not having it bolted or welded through and through, but isn't here some catch..:-)
In the last stage of designing the lower frame but still deciding on the motor mounting!
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Post by paulg100 on Jan 27, 2016 22:00:40 GMT
I got this concept from another build so hopefully it will work ok. www.youtube.com/watch?v=na2Pj-6mY30 im not sure dr D intended to raise the main beams up off the floor originally as it now seems to be causing some flex but was needed due to the lever arm length. I kept my lever arms at 160mm CC so the beams and mounts are all at the same level on the floor. the weight of the steel and gearbox's and motors is pretty darn heavy all together. Once it is bolted with nyloc nuts and torqued hard it appears to be very solid but i guess we will see, i figured if i need the extra security later ill just weld the mounts to the frame once its tested and i know its all in the right place.
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Post by mhensen on Jan 27, 2016 22:16:08 GMT
Ah.. Saw the video and see what you mean with the flexing.. I thing if you connect the motors at the top with a bar it will stop or limit the flex.. I will make a wooden cornerpiece so that I can connect 2 motors at the corners.. I'll go for the same route as I see the options you have in case you need a small change.. BTW my levers will be 180mm and my rods at the topframe at 90mm apart, didn't wanted to do the 50mm version, would mean less stable in my idea.
please film the testing of you frame.. would love to see it moving!!!
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Post by paulg100 on Jan 27, 2016 22:25:08 GMT
yep i wanted longer levers which is one of the reasons i went with bigger gears and motors, but after working out the height of the sim at maximum heave it was getting uncomfortably close to the ceiling. i probably had enough room but ill know better once i have "mark 1" up and running yep ive got a few ideas where i can add extra supports if needed, i think our gearboxes will allow easy mounting of extra supports. will get vids for sure, a bit of work to do still before i get the platform mounted but at least i can push forward again now.
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Post by paulg100 on Jan 30, 2016 13:20:41 GMT
Some progress so far today.. youtu.be/zhyXW8P5zygThis is X-sim offline 6dof test programme. The pots are zeroed but not connected to shaft. Tried connecting one pot to shaft which on movement caused the shaft to rotate then stop and oscillate. I think this is something to do with 135, 246 config and pot direction? the lever directions do not match the xsim model on movement so I am checking a/b wiring at the minute to get directions to match. More soon ..
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Post by paulg100 on Jan 30, 2016 16:40:15 GMT
mm..
OK all motors move OK in xsim 6dof software without pots connected.
When I connect the pot to the shaft I can tune it so that the shaft is stationary and frequency is zero on inverter ie 50% pot position. But as soon as move command is sent (ie with manual sliders on 60dof plugin or even with amc buttons) the motor just races off to the 180 limit of the pot then stops and oscillates.
Is there a setting I'm missing to set the pot correctly?
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Post by vicpopo on Jan 30, 2016 22:20:12 GMT
Test the other setup as the one you are using for sensor postion . If pos 135 neg 246 selected , test the other one.And normally if I remember because there is a while since I wired my sim rig , you have to swap the wire for 3 sensors positions .
But normally if everything is ok when choosing pos 123456 it has to work correctly.
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Post by paulg100 on Jan 31, 2016 9:57:16 GMT
OK thanks Vic I have some more time to play around today so will see how I get on and report back..
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Post by paulg100 on Jan 31, 2016 12:42:11 GMT
OK I have it sorted now, its just AB direction issues, I am finding the easy way to solve it is just leave pos 135 and neg 246 and just switch the AB wires on AMC until everything is correct. another problem I have found now the flexible couplers like the one on ebay: These are not proving to work that great, they may save stress on the pot but because of the amount of flex it is proving difficult to get the pot to re-centre exactly on return to home position. Think I need to find a different solution without the flex.
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Post by GA-Dawg on Jan 31, 2016 15:07:48 GMT
Hi Paul, I have order this for my project. There simple RC u joints. They will allow for slight miss alignment. Haven't test yet so still just a theroy -gadawg
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