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Post by jthiani on Oct 9, 2015 3:47:14 GMT
Hi all ..... i have the Huanyang inverters that use sink mode and i am trying to figure out the correct connections to the ext board using relays. Attached are some pictures of the connections to the vfd. Below is the circuit diagram of the VFD i have Below is a diagram of the connection terminal on my vfd And last is a picture of the relay board im using So i need some help figuring out the connections. Thank you Attachments:
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Post by clyevo on Oct 12, 2015 7:30:32 GMT
U put the relay switch at FOR-DCM terminal and REV-DCM terminal. But i have to say the sound of the relay switching is quite annoying. I am currently using the relay way but the other way according to tronicgr is you can buy ULN2803 chips to replace the UDN2981 and that will work like a relay switch on the ext board.
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Post by jthiani on Oct 13, 2015 1:53:53 GMT
U put the relay switch at FOR-DCM terminal and REV-DCM terminal. But i have to say the sound of the relay switching is quite annoying. I am currently using the relay way but the other way according to tronicgr is you can buy ULN2803 chips to replace the UDN2981 and that will work like a relay switch on the ext board. Thanks for the reply clyevo. I now understand how to make the connections. However just like you, i would prefer to not use the relay board and according to the connections on my vfd, i cannot tie the ACM ground to the DCM ground. So i i were to use the ULN2803 chips, where would i connect the DCM ??
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Post by clyevo on Oct 13, 2015 7:13:43 GMT
U put the relay switch at FOR-DCM terminal and REV-DCM terminal. But i have to say the sound of the relay switching is quite annoying. I am currently using the relay way but the other way according to tronicgr is you can buy ULN2803 chips to replace the UDN2981 and that will work like a relay switch on the ext board. Thanks for the reply clyevo. I now understand how to make the connections. However just like you, i would prefer to not use the relay board and according to the connections on my vfd, i cannot tie the ACM ground to the DCM ground. So i i were to use the ULN2803 chips, where would i connect the DCM ?? U would connect DCM to the same ground that you connect the ground of the analog 0-10v. This means it is not an isolated ground which can potentially leak current and noise into the analog signal which was the reason i use relay in the first place. But tronicgr has been successful using sink mode with ULN2803 so i think it would be fine. I just thought i would go the safest way but the relays annoying clicking sound is making me think twice. It sound like someone typing an essay on steroid with my blue colored mechanical keyboard.
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Post by jthiani on Oct 14, 2015 2:15:03 GMT
I have sorted out my sinking connections by tying together the dcm and acm terminals. I now have direct response from the 6dof extension board. i now have another problem as shown in the video. when the motor tries to get to center, it oscillates trying to find its center. i have tried playing with the pid values and the direction controls but it just keep oscillating. is there something im missing here ??
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Post by tronicgr on Oct 14, 2015 3:04:55 GMT
I have sorted out my sinking connections by tying together the dcm and acm terminals. I now have direct response from the 6dof extension board. i now have another problem as shown in the video. when the motor tries to get to center, it oscillates trying to find its center. i have tried playing with the pid values and the direction controls but it just keep oscillating. is there something im missing here ?? Change the 6dof sensor direction from the LCD menu. It seems that the sensor is reading wrong direction. Or swap Fwd/Rev on the VFD inverter. Also try decreasing the ramp setting on your VFD to 0.5sec if all else fails. Thanks Thanos
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Post by jthiani on Oct 14, 2015 3:27:58 GMT
I have sorted out my sinking connections by tying together the dcm and acm terminals. I now have direct response from the 6dof extension board. i now have another problem as shown in the video. when the motor tries to get to center, it oscillates trying to find its center. i have tried playing with the pid values and the direction controls but it just keep oscillating. is there something im missing here ?? Change the 6dof sensor direction from the LCD menu. It seems that the sensor is reading wrong direction. Or swap Fwd/Rev on the VFD inverter. Also try decreasing the ramp setting on your VFD to 0.5sec if all else fails. Thanks Thanos Thanks for the fast response @thanos ..... i just tried what you have suggested and it did not work. the motor still oscillates. Could i have bad PID settings ??
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Post by Mitch on Oct 14, 2015 3:32:07 GMT
Honestly it seems like PID to me. Looks like an overshoot of set point and then correction. Have a look at this - I'm not sure if this is the right manual for your inverter but it looks like your VFD is preset with some PID settings. You want the AMC to do the PID.
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Post by tronicgr on Oct 14, 2015 3:33:00 GMT
Its the ramp acceleration deceleration values in the VFD inverter... Also lower the max frequency in your VFD.
Set the max motor speeds in the amc1280usb to 25% for both online-offline and increase slowly.
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Post by Mitch on Oct 14, 2015 3:34:53 GMT
You think it's the ramp, accelerating past the set point? Could be... Check VFD first. Updated my previous post with some info.
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Post by jthiani on Oct 14, 2015 5:23:46 GMT
Mitch .... that is the correct manual for my vfd. i have just set the PD160 to 1 and i get the same response from the motors. Would you suggest changing any other parameters?? @thanos the max frequency i have is 60. should i change this?? Also i changed the ramp up speed from 0.1 to 0.5 and the oscillation was still there but much slower ...
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Post by Mitch on Oct 14, 2015 5:43:50 GMT
Motor max speed on the AMC will limit the max freq. don't worry about adjusting VFD max freq less than 60. (If this matches your motor max freq)
I haven't read your VFD manual so I don't know what selecting 1 on pd160 does. My guess is that it's connected to the terminal that receives 0-10v from the AMC, in which case the 'target' is a frequency target, as demanded by the AMC. With 1 selected P159 will then be set by this input voltage. You would want the control signal to be able to use 100% of this (p161?). If pd160 gets its signal from the AMC, then I would lower pd157.
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Post by jthiani on Oct 14, 2015 6:11:14 GMT
Motor max speed on the AMC will limit the max freq. don't worry about adjusting VFD max freq less than 60. (If this matches your motor max freq) I haven't read your VFD manual so I don't know what selecting 1 on pd160 does. My guess is that it's connected to the terminal that receives 0-10v from the AMC, in which case the 'target' is a frequency target, as demanded by the AMC. With 1 selected P159 will then be set by this input voltage. You would want the control signal to be able to use 100% of this (p161?). If pd160 gets its signal from the AMC, then I would lower pd157. Thanks for the fast response ..... so the values for pd160 are 0 - (set by operator) and 1 - (set by external terminals 0-10v) .... factory default is 0 so i changed it to 1. I did not however change any of the other pid values in the vfd. So if i understand your reply, pd161 should be 100% (which it is as this is the factory default) and i should lower the value of pd157 which has a default of 5.0. also should i change pd156 which has a default of 100% ?? .. thanks Mitch
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Post by clyevo on Oct 14, 2015 13:31:01 GMT
Motor max speed on the AMC will limit the max freq. don't worry about adjusting VFD max freq less than 60. (If this matches your motor max freq) I haven't read your VFD manual so I don't know what selecting 1 on pd160 does. My guess is that it's connected to the terminal that receives 0-10v from the AMC, in which case the 'target' is a frequency target, as demanded by the AMC. With 1 selected P159 will then be set by this input voltage. You would want the control signal to be able to use 100% of this (p161?). If pd160 gets its signal from the AMC, then I would lower pd157. Thanks for the fast response ..... so the values for pd160 are 0 - (set by operator) and 1 - (set by external terminals 0-10v) .... factory default is 0 so i changed it to 1. I did not however change any of the other pid values in the vfd. So if i understand your reply, pd161 should be 100% (which it is as this is the factory default) and i should lower the value of pd157 which has a default of 5.0. also should i change pd156 which has a default of 100% ?? .. thanks Mitch the PID function on the inverter is used for example if the motor is a fan and regulating temperature of an object the fan is cooling You have two analog input, VI and AI Let say VI is used to accept feedback 0-10v (in this case 0v being cool and 10v being the hottest) which translate to the frequency/speed of 0-50hz or 0rpm-1400rpm If u set the pd160 to 1, the second analog signal (AI) will be used to determine the PID strength 0-100%(pd161 and pd162) which determined how sensitive it is to the temperature changes This PID strength can then be change remotely - for example by an operator sitting in a control center in the factory This means the VI is not directly controlling the speed of the motor, it goes through a process control (PID) producing the calculated appropriate speed/frequency sent to the motor. so in your situation right now since the AMC1280 has the process control (PID) and the one accepting the feedback sensor -> there is no reason to use the inverter process control (PID) so the PID control (pd160) should be 0 - set by operator means it will use the PD159(default 0%) value that you set within the inverter settings its meant to be 0% because you are not using this function so the only analog signal accepted by your inverter will be use to control the frequency/speed (0-50/60hz) and is provided by AMC1280 and nothing else BTW, there is usually a different PID settings on the inverter has something to do with inertia of your system (the mass/weight of your platform and all) and still needed for sensorless vector control because it uses this to achieve greater accuracy, you can tune the the inertia settings once you put all the weight including your friend on the platform seat. Usually the default settings is for a continuous rated load. In your case the weight the motor take might be lighter and will vary depending on platform position so you still need to tune it manually. Whether u have it or not depends on your inverter model which i am not sure in your case. At least that is what i understand from my inverter manual book.
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Post by jthiani on Oct 14, 2015 14:03:03 GMT
Thanks clyevo ..... that is very good info you have there and i appreciate the help. Since the oscillation problem started before i changed the pd160 value from 0 to 1, and it persisted after i changed the value, my conclusion is that this variable is not the culprit. so at the moment i am still having the oscillation problem. I have played around with the PID values in the AMC board and there is no noticeable difference in the rate of oscillation.
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