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Post by tronicgr on Aug 27, 2014 23:24:10 GMT
In Vector control, the VFD uses feedback from the motor to see the error " special motors are required ", then to determine the exact vector of voltage AND frequency to produce exactly what is needed to correct the error. It has a high speed processor to crunch the numbers and quickly tweak the output voltage and frequency pattern to maximize the torque and / or tighten the speed regulation. Because of this, you can operate a motor at Breakdown Torque at any speed, even zero if necessary. This is called "Sensorless Vector Control" (SVC). SVC uses very sensitive current sensors inside of the VFD to watch exactly what is going on, and comparing it to a mathematical model it has created of the motor during setup (the "tuning" procedure).
Auto-Tune on the Hitachi WJ200. First let me say it's a great thing to do just to assure it is setup properly for your motor. The second part which really works for how we use these inverters and motors is that you can turn on your Sensorless Vector Mode (A044, change value 0 to value 3) What this does is that it will increase the tourque as much as 200% on start up and slow speeds if needed. With the weight and movements we utilize this really helps let the motors move properly so you don't have any potential overloads without the setting set to 3. Hope this makes sense as it made a huge difference for me when A044 was activated.
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Post by adamx0x5 on Sept 10, 2014 10:04:52 GMT
which inverters used with AMC control board?
best to work and low cost
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Post by riton39 on Sept 10, 2014 16:00:09 GMT
we must look at the features: with experience, it is necessary to have a connection to a braking resistor.
the steering control must do so with 24v, 10v and 0 ... for speed.
I used OMRON, other SEW, now I'll try ABB.
All basic frequency inverters almost works in this mode.
it may be important to buy from someone who can provide help for configuration, there are many functions
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Post by renxmotion on Oct 16, 2014 3:16:37 GMT
Hello Thanos! You can help with connections your controller and Inverter Mitsubishi D700-SC Please write me on email and i give a foto or say how insert foto on forum please. And Please answer on my email questions, Please help us.
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Post by tronicgr on Oct 17, 2014 4:29:47 GMT
Hi renxmotionSometimes I'm busy to answer to any email, not only yours. Please understand that I have to share my time between many things and tasks. motionsim.blogspot.com/2014/08/sharing-time-between-development-email.htmlFor the Mitsubishi D700-SC I'll have to find some time to make complete diagram. Here is a quick one here: That is from the Manual: Mitsibishi D700 Quick manual
to make it short, you need to set the correct Digital inputs in Source mode (to be able to accept +24v signals. Make the Analog signals accept 0-10v Set the analog in setting to V )voltage) not I (current). To add attachments and links you can use the "reply" button instead of " post quick reply". This will give you access to all buttons and allow you add attachments to your posts. Thanks Thanos
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Post by blizzard on Nov 10, 2014 16:43:14 GMT
Hello Thanos,
thank you for your phantastic support by email to find a good solution for my project in the past!!
In the meantime I got my first three-phase worm gear motor(1,1KW and 15rpm) and a suitable VFD from Hitachi (WJ200-015HF) with 1,5KW(three-phase). Your AMC1280USB and Ext.board are working very well and with the BFF software from Ian, too.
Now I need more help please. It would be very nice if you could send me a wiring plan how to connect the Hitachi inverter.
Thx in advance
Rolf
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Post by tronicgr on Nov 11, 2014 21:47:56 GMT
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Post by blizzard on Nov 11, 2014 22:38:55 GMT
Hi Thanos,
thank you so much again!
Your support and help is realy very great! I'll study the new information and keep you and your(our) new community informed.
thanks
Rolf
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Post by stevant on Nov 18, 2014 18:28:59 GMT
Hi all,
I found out some great information, to me at least, in regard to the Auto-Tune on the Hitachi WJ200. First let me say it's a great thing to do just to assure it is setup properly for your motor. The second part which really works for how we use these inverters and motors is that you can turn on your Sensorless Vector Mode (A044, change value 0 to value 3) What this does is that it will increase the tourque as much as 200% on start up and slow speeds if needed. With the weight and movements we utilize this really helps let the motors move properly so you don't have any potential overloads without the setting set to 3. Hope this makes sense as it made a huge difference for me when A044 was activated.
Good Luck!!!
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Post by blizzard on Nov 19, 2014 21:23:20 GMT
Hi Stevant,
that's very interesting. I think I 'll understand it much better, if I've collected some practical experience.
regards
Rolf
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Post by faizulri on Dec 11, 2014 22:27:21 GMT
Hi All,
I'm very new to all these and are learning on the go.
I just want to clarify a few thing based on what's posted above. From what I understand from Thanos's post, there are two types of inverters; scalar VFD and vector VFD. And vector VFD inverters are better because they can control the AC motor better. And the Hitachi WJ200 is a vector VFD inverter.
And I understand from the post that the vector VFD inverter does not need an encoder (as in those potentiometers that people use in their motion platform), but I need a "vector VFD ready" motor for it to work. So basically, I can connect the motor to the AMC1280USB and the vector VFD and I'm set? Am I understanding this correctly?
Thanks for all your explanation.
Faizul
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Post by tronicgr on Dec 12, 2014 5:40:49 GMT
Hi faizulriYou need position sensors in both type of vfd inverters. Think of them as speed controllers (with direction change ability). The difference is that the vector ones can resolve better the position of the poles of the AC motor providing more torque from minimal speeds and better accuracy on maintaining the commanded speed. They do that without expensibe absolute position sensors that high end servomotor have, essentially by sensing the return of current from the motor. BLDC motors have similar sensorless feedback to maintain certain speed (electric bikes for example). Thanks Thanos
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Post by riton39 on Dec 12, 2014 7:51:33 GMT
Inverters with U / F have made progress now For example my mini J7 which is an old drive now has a torque of 150% at 5 Hz. new inverter U / F have 150% torque at 0 Hz
But I advise you to choose the drive with vector control, it's even better.
With vector control torque is maximum, speed ... much better! it has almost the performance of a servo motor.
this can prevent errors may be. it depends on how you use it and how you do your settings.
with an optimal setting, I can very well to drive my motor optimally!
But I will choose the vector control for my new engine, it must evolve !! the price difference is not significant. you can see my videos for comparative information
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Post by rookie on Dec 12, 2014 14:45:37 GMT
Hi All I am a electrician by trade working in the motor manufacturing industry. I have some experience on VFD controlled AC motors. Out of personal experience I have learned that when a AC motor is being run at lower speeds than the speed it was originally designed for, we encounter some serious problems with overheating of the motor in continuous use. This is mainly because the motor's built-in cooling fan also run at much lower speed (same speed as the motor) thus being a lot less efficient, while the motor is still generating the same amount of heat. We overcome this by installing additional fans to the back of the motors to create a forced cooling effect. Would this also be necessary in a motion simulator environment or is it a case that the motor's capabilities are not fully utilized all the time, making forced cooling redundant. Please forgive me if this is a silly question, but the motion sim bug has just bitten and I am still trying to absorb all the information I get. Thanks for a very informative site Cheers Marius (Rookie)
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Post by faizulri on Dec 12, 2014 15:32:50 GMT
Hi All,
Thanks Thanos and riton39 for your explanation. I'm still absorbing your information, so I might have more questions later.
But one question, do I need a special "VFD ready motors" to use with the vector VFD inverters or any motor can be used?
Another question, as Thanos said above, the position sensors (potentiometers,optical encoders, etc) are controlling the speed and direction of the motors. Is the VFD also controlling the motors? And the AMC1280USB is also controlling the motors too? In what sense? Could you guys clarify this for me?
I am sorry for my newbie questions. I have a lot to learn.
Best Regards,
Faizul
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