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Post by tronicgr on Oct 24, 2014 0:50:58 GMT
Ok....I pushed my pin down after I made my changes. I noticed your 4th Pin is up...should mine be up? It is down now. The forth switch is ON on my board on the video as I was using the PWM mode for testing on bench...  For use with 6DOF ext board, the forth switch should be off! Thanks Thanos |
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Post by stevant on Oct 24, 2014 1:31:53 GMT
Got it........motors at 45%, P at 18 and I at 176, much smoother....................once I get more weight on the platform it will be even better. Thee weight has a lot to do with the down force on the motors....I would think. Reduces backlash in the gearbox. Thanks again. Skype soon!!! Penne all vodka?  |
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Post by stevant on Oct 24, 2014 12:19:50 GMT
More progress last night after some coffee and a shot of Ouzo! Lol... I changed my mounting points on both the upper platform and the gearbox arm. I brought them both right against the mounts to avoid any play. I had to change the ratio since it is now smaller due to the shifting of the joints. It has made a big difference in regards to the vibrations and shaking. I have been able to raise my P value for better movement and motor speed is now at 60%. When I sit on top and add more weight it gets much smoother. Things moving in the right direction now. Awaiting my permanent upper platform to hold my chair, monitors, etc. I'll shoot more video after I mount and calibrate with Thanos.
Until my next post......
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Post by stevant on Oct 25, 2014 15:55:45 GMT
I am going to wait until I get my final upper platform and calibrate it with Thanos before I stress out about the vibrations my upper platform is experiencing at this time. I have to attribute it too the platform as I can't see what else it could be. Does anyone think that the diameter of the ball joints is too big? Can that be causing the problem? I've seen other platforms with wooden platforms and they appear to be smoother than mine, but most are using a smaller diameter ball joint than I am so it has me thinking.
I'll keep you all posted!!!
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Post by stevant on Oct 28, 2014 10:04:29 GMT
Hey Thanos,some food for thought. The motors I have are 1hp motors with a 3/4 hp gearbox. Could that be a problem in regard to the stepping of the gearbox? I'm getting the permanent upper platform tonight so I'm hoping the temporary platform was the culprit. We'll see tonight. Just wanted to know if we needed any adjustments in the inverters for the motors I am using. Keep your fingers crossed!! Talk to you soon...... Steve PS- I can't seem to slow down the initial speed of the startup for the platform. I've done what you suggested in the post but it always starts hard and bangs to the start point when I start the simulator. Maybe an adjustment I'm overlooking? Also, when using the potentiometer on the AMC board, I have to click it sometimes several times for it to go into adjustment mode. Just something else to address when we Skype.  |
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Post by tronicgr on Oct 29, 2014 2:06:59 GMT
Hey Thanos,some food for thought. The motors I have are 1hp motors with a 3/4 hp gearbox. Could that be a problem in regard to the stepping of the gearbox? I'm getting the permanent upper platform tonight so I'm hoping the temporary platform was the culprit. We'll see tonight. Just wanted to know if we needed any adjustments in the inverters for the motors I am using. Keep your fingers crossed!! Talk to you soon...... Steve PS- I can't seem to slow down the initial speed of the startup for the platform. I've done what you suggested in the post but it always starts hard and bangs to the start point when I start the simulator. Maybe an adjustment I'm overlooking? Also, when using the potentiometer on the AMC board, I have to click it sometimes several times for it to go into adjustment mode. Just something else to address when we Skype. Hi Steven, Tried to call you tonight... I think it was too late... I'll try to contact you tomorrow morning sometime. You mean the startup from powering up the platform or from idle (park motor) state to motion from the software? Thanks Thanos |
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Post by stevant on Oct 29, 2014 14:23:28 GMT
Hi all,
Last night I made a huge step in my platform, with the help of Thanos of course. Thank you Thanos for using Team Viewer with me and helping me make changes to my settings to get me closer to where I need to be. I replaced my temporary upper wooden platform last night with my permanent steel platform and was impressed with how the weight made a significant difference in the perfromance. I mean that in a good way. I'm not worried about the motors and gearboxes handling the weight but it's amazing how it helped smooth out the movements. In fact I replaced my HEIM joints with the original teflon joints I first purchased which I thought originally were going to be too stiff, Boy was I wrong. The platform is quiet now too which is a big plus. I'm going to move forward with the mounting of my finished platform which will consist of the chair and the monitors. I am then going to close it all in and make it look sleeker keeping with my Black and yellow theme like the stationary platform I am using now.
More videos to follow.................Thanks again Thanos. Next time we Skype!!
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Post by stevant on Oct 29, 2014 18:24:27 GMT
Hey Thanos,
Hitachi has an Auto-Tune feature on their WJ200 inverter. It automatically adjusts some of the H parameters in the drive and I was told that it would make the motion even more fluent based on its usage. What do you think about that??
Thanks....
Steven
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Post by tronicgr on Oct 29, 2014 20:02:46 GMT
Hey Thanos, Hitachi has an Auto-Tune feature on their WJ200 inverter. It automatically adjusts some of the H parameters in the drive and I was told that it would make the motion even more fluent based on its usage. What do you think about that?? Thanks.... Steven I've seen that, not sure how to activate the autotune on the hitachis... I can't find any instructions on-line on how its done. I was trying to do the auto-tune on a hitachi WJ200 over the telephone with Mike just two days ago, but he could not figure out how to perform the motion when it was activated. So we end-up entering manually the R1,R2 and Amp readings from his motors plates in the VFD parameters... His setup worked much smoother after that...! Each motor has its own characteristics that auto-tune can discover to get the best efficiency for the motor both in consumption and performance! Thanks Thanos |
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Post by stevant on Oct 29, 2014 20:29:52 GMT
It's under the H001 setting and you select 02 which is Auto-tune with rotation. You can do 01 which is without rotation. Might be better since arms are all hooked up. You have to set A002 to 02 so you can use the front RUN button to start the proceedure. Once it is done it will show _ _ _ _ O which means it worked. If the O at the end is missing a bottom, it failed. Once complete change A002 back to its original setting, H001 will go back to 00. They say it will be smoother after I run it. I will have to do all six. Think I should try it??
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Post by vulbas on Oct 29, 2014 20:39:48 GMT
very good job bravo |
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Post by stevant on Oct 29, 2014 20:48:00 GMT
Thank you!!!!
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Post by vicpopo on Oct 29, 2014 20:58:50 GMT
With the Hitachi can you choose an another mode than the U/f control mode?
Is there a vector flow control mode.?
If yes the inverter have to measure stator resistance , inductance etc.. to create the mathematic model to control the motor .
and yes good job for the motion , smooth and fast.
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Post by stevant on Oct 29, 2014 21:03:22 GMT
They call it Sensorless Vector Mode...thats what I am referring too.....so I should try it???
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Post by vicpopo on Oct 29, 2014 21:32:39 GMT
For me yes , sensorless means i suppose that the inverter doesn't need an encoder on the motor shaft to control the magnetic flow.
On my inverter I've got a vector flow control mode ( SEW Inverter) that I use on my 6dof and without encoder on the motor shaft !
With the inverter I 've got the PC software ( movitools software) to setup the inverter / motor at startup And as the motors are from SEW also , all the database for motors are stored in the software.That means that the sofware send to the inverter all motor specifications .
If the motor is not a Sew motor the software has a special feature which launch a program to measure all motor specifications ( resistance etc..).
Normally this vector mode is better to control an asynchronous motor with more dynamics and one other advantage is that you can get 100% torque at 0 rpm motor .
Ask to Thanos and if you test it maybe before without your upper platform hooked to the motors ! ;-)
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