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Post by tronicgr on Oct 15, 2015 4:12:37 GMT
You can change the max frequency of the inverter to slow down the max motor speed, also you can reduce the max motor speed in the amc1280usb LCD menu, this will help with the oscillation if your gearbox is too fast.
Also did you try to turn off the LCD display (push down the DIP switch #1) to deactivate the LCD menu and have more stable PID refresh rate?
Also reducing the ramp acceleration will considerable reduce the oscillation as well. Try to bring it down to .3 or .2 sec or the lower you can without getting overload errors from the VFD.
Thanks Thanos
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Post by clyevo on Oct 15, 2015 4:30:36 GMT
You can change the max frequency of the inverter to slow down the max motor speed, also you can reduce the max motor speed in the amc1280usb LCD menu, this will help with the oscillation if your gearbox is too fast. Also did you try to turn off the LCD display (push down the DIP switch #1) to deactivate the LCD menu and have more stable PID refresh rate? Also reducing the ramp acceleration will considerable reduce the oscillation as well. Try to bring it down to .3 or .2 sec or the lower you can without getting overload errors from the VFD. Thanks Thanos so you think it has nothing to do with using the relay? i already off the lcd function, and no observable changes i will try reduce the acc/dec, because i havent connected the platform yet, i dont think there will be any error if i slow down the motor by reducing the max frequency wouldnt that be the same thing as reducing the p, since reducing the p also slow down the motor? thanks
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Post by clyevo on Oct 29, 2015 8:48:51 GMT
i think my system is way to sensitive and there is still oscillation at target position I have tried reducing the motor speed, the oscillation still there but oscillation less frequent than before probably because its overshoot less distance I played with PID particularly and found D to have no effect, i found P of 9 to have almost no oscillation but sluggish response I also tried Kp and Ki and found that it does has effect particularly the by increasing the Ki i get less oscillation during but reduce responsiveness as well
This is my current settings and found out that it is quite responsive as i don have any comparison because this is my first motion sim But as you can see there is some oscillation This is using demo version of ian bff on dirt3
P=15, I=0, D=0
Motor speed 90%
Kp and Ki settings in the inverter are left to default, Kp=25, Ki=1sec
Btw, the noisy fast clicking sound is the mechanical relay sending rev and fwd command, and shows you how fast its oscillate between both direction.
Edit : my acc/dec inverter settings are both at 0.0 sec because no overcurrent error at this settings, i am not sure if that's ok
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Post by hexpod on Oct 29, 2015 12:22:25 GMT
i think my system is way to sensitive and there is still oscillation at target position I have tried reducing the motor speed, the oscillation still there but oscillation less frequent than before probably because its overshoot less distance I played with PID particularly and found D to have no effect, i found P of 9 to have almost no oscillation but sluggish response I also tried Kp and Ki and found that it does has effect particularly the by increasing the Ki i get less oscillation during but reduce responsiveness as well This is my current settings and found out that it is quite responsive as i don have any comparison because this is my first motion sim But as you can see there is some oscillation This is using demo version of ian bff on dirt3 P=15, I=0, D=0 Motor speed 90% Kp and Ki settings in the inverter are left to default, Kp=25, Ki=1sec Btw, the noisy fast clicking sound is the mechanical relay sending rev and fwd command, and shows you how fast its oscillate between both direction. In fact setting the PID in our case is always a compromise. Fast accurate response without oscillations are very hard to achieve because of constantly changing load on the crank levers. If you reduce the P in Thanos controller to 15 for ex., it will reduce the oscillations but it will also considerably increase the deceleration time. It will make the platform slower and unable to translate small vibrations needed for realistic simulation. That's what I noticed in my rig. Please share when you will find a good compromise. cheers.
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Post by paulg100 on Oct 29, 2015 14:22:08 GMT
It sounds like its raining nuts and bolts with those relays!
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Post by clyevo on Oct 30, 2015 2:07:14 GMT
i think my system is way to sensitive and there is still oscillation at target position I have tried reducing the motor speed, the oscillation still there but oscillation less frequent than before probably because its overshoot less distance I played with PID particularly and found D to have no effect, i found P of 9 to have almost no oscillation but sluggish response I also tried Kp and Ki and found that it does has effect particularly the by increasing the Ki i get less oscillation during but reduce responsiveness as well This is my current settings and found out that it is quite responsive as i don have any comparison because this is my first motion sim But as you can see there is some oscillation This is using demo version of ian bff on dirt3 P=15, I=0, D=0 Motor speed 90% Kp and Ki settings in the inverter are left to default, Kp=25, Ki=1sec Btw, the noisy fast clicking sound is the mechanical relay sending rev and fwd command, and shows you how fast its oscillate between both direction. In fact setting the PID in our case is always a compromise. Fast accurate response without oscillations are very hard to achieve because of constantly changing load on the crank levers. If you reduce the P in Thanos controller to 15 for ex., it will reduce the oscillations but it will also considerably increase the deceleration time. It will make the platform slower and unable to translate small vibrations needed for realistic simulation. That's what I noticed in my rig. Please share when you will find a good compromise. cheers. In the video the P is already at minimum 15 but still oscillating hence my need for help on this matter. Just to add more information, the acceleration and deceleration rate on the inverter is 0.0sec and there is no overcurrent so i thought its ok to keep it at that but result in less smoother but responsive ride.
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Post by hexpod on Oct 30, 2015 10:22:37 GMT
In fact setting the PID in our case is always a compromise. Fast accurate response without oscillations are very hard to achieve because of constantly changing load on the crank levers. If you reduce the P in Thanos controller to 15 for ex., it will reduce the oscillations but it will also considerably increase the deceleration time. It will make the platform slower and unable to translate small vibrations needed for realistic simulation. That's what I noticed in my rig. Please share when you will find a good compromise. cheers. In the video the P is already at minimum 15 but still oscillating hence my need for help on this matter. Just to add more information, the acceleration and deceleration rate on the inverter is 0.0sec and there is no overcurrent so i thought its ok to keep it at that but result in less smoother but responsive ride. Radical solution, maybe not the best, would be to increase the min. motor speed a bit.
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Post by clyevo on Oct 30, 2015 16:41:52 GMT
In the video the P is already at minimum 15 but still oscillating hence my need for help on this matter. Just to add more information, the acceleration and deceleration rate on the inverter is 0.0sec and there is no overcurrent so i thought its ok to keep it at that but result in less smoother but responsive ride. Radical solution, maybe not the best, would be to increase the min. motor speed a bit. u mean the motor min speed, i already did that to reduce the small oscillation during parking/home position. It is at 4. It is in hz right? But look like it has no effect during ride.
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Post by hexpod on Oct 30, 2015 18:46:08 GMT
Radical solution, maybe not the best, would be to increase the min. motor speed a bit. u mean the motor min speed, i already did that to reduce the small oscillation during parking/home position. It is at 4. It is in hz right? But look like it has no effect during ride.
Are you sure that your oscillations are not coming from game telemetry, and are useful to simulate bumps on the road? If yes you can reduce this effect by applying more or less the washout filters in Ian BFF software.
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Post by clyevo on Oct 31, 2015 2:55:18 GMT
u mean the motor min speed, i already did that to reduce the small oscillation during parking/home position. It is at 4. It is in hz right? But look like it has no effect during ride.
Are you sure that your oscillations are not coming from game telemetry, and are useful to simulate bumps on the road? If yes you can reduce this effect by applying more or less the washout filters in Ian BFF software.
Thanks! But I am not sure it is the bump on the road, what is your opinion based on the video? I saw your video it is quite smooth ride. I would like to try that way to rule out cause of the oscillation This is all the values in the .bff file Which one should i change if i want to reduce the excessive bumps on the road? Edit: I know what is rad/sec but what does sec/rad and this parameter means?
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Post by hexpod on Oct 31, 2015 9:42:07 GMT
Are you sure that your oscillations are not coming from game telemetry, and are useful to simulate bumps on the road? If yes you can reduce this effect by applying more or less the washout filters in Ian BFF software.
Thanks! But I am not sure it is the bump on the road, what is your opinion based on the video? I saw your video it is quite smooth ride. I would like to try that way to rule out cause of the oscillation This is all the values in the .bff file Which one should i change if i want to reduce the excessive bumps on the road? Edit: I know what is rad/sec but what does sec/rad and this parameter means? I would start here:
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Post by clyevo on Nov 2, 2015 2:02:04 GMT
Thanks! But I am not sure it is the bump on the road, what is your opinion based on the video? I saw your video it is quite smooth ride. I would like to try that way to rule out cause of the oscillation This is all the values in the .bff file Which one should i change if i want to reduce the excessive bumps on the road? Edit: I know what is rad/sec but what does sec/rad and this parameter means? I would start here:
Thanks i will try that. Is there something like this on X-sim as well?
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Post by paulg100 on Nov 5, 2015 13:54:03 GMT
Hi Clyevo
Did you have a chance to measure your power draw with the system running yet?
Did you run a purpose supply or are you using your existing house circuits?
Just wondering what the maximum amps is, i think you used 1.5kw motors?
Thanks
Paul.
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Post by clyevo on Nov 6, 2015 2:13:26 GMT
Hi Clyevo Did you have a chance to measure your power draw with the system running yet? Did you run a purpose supply or are you using your existing house circuits? Just wondering what the maximum amps is, i think you used 1.5kw motors? Thanks Paul. I never got to measure the power draw yet. because i always monitor the 0-10v analog on my inverter and not the current which is analogous to the motor speed but not the torque. But from my observation i can tell you i am using less than half of the combine rated current of my motor at any given time. I ran another high current rated copper cable from the mains and attached 6x 20amps fuse. But mine is 1.5kw motor with 2.2kw inverters. I tend to overdo things and is extra cautious by nature. Haha. So your main reference should be stevant motion simulator. I recall in his thread he did show some pictures of his inverters displaying the current in realtime so i think he can tell you about this.
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Post by paulg100 on Nov 6, 2015 7:15:39 GMT
Thanks clyevo thats very helpful.
my motors are 1.1kw 1.5hp, so sit between yours and stevant.
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