Question for Russ and other VFD ninja's

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midy
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Question for Russ and other VFD ninja's

Post by midy »

It would appear my VFD does have sensorless vectoring, which I have not the faintest idea is! Could you chaps give a laymans description please?
And what's it's pro's and cons?
Snipet from the manual:
Control mode
SV100 VFD has three control methods, it is set by A0.01:
0. Vector control without PG: it is vector control without speed sensor, need not to install the PG, at the same time it
has very high control performance, it can control the speed and torque of motor accurately. It has the characteristics
like low frequency with high torque and steady speed with high accuracy. It is often used in the applications that the
V/F control mode can not stisfy, but requires high robustness.
1. Reserved
2. V/F control: It is used in the applications that do not require very high performance, such as one VFD controls
multiple motors.

cheers chaps
cncman172
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Re: Question for Russ and other VFD ninja's

Post by cncman172 »

I would set it to "0" for vector control, the other option is "1" but that is when you are controlling multiple motors like ventilation for example.

Russ




Types of Control
AC drives that use PWM techniques have varying levels of
performance based on control algorithms. There are four basic
types of control for AC drives today. These are Volts per Hertz,
Sensorless Vector Control, Flux Vector Control, and Field
Oriented Control.

Volts/Hertz control is a basic control method, providing a
variable frequency drive for applications like fan and pump.
It provides fair speed and starting torque, at a reasonable
cost.

Sensorless Vector control provides better speed regulation
and the ability to produce a high starting torque.

Flux Vector control provides more precise
speed and torque
control with dynamic response.

Field Oriented Control drives provide the best speed and
torque regulation available for AC motors. It provides DC
like performance for AC motors, and is well suited for typical
DC applications.
midy
Posts: 203
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Re: Question for Russ and other VFD ninja's

Post by midy »

So it seems like sensorless vector conrtol is somewhere in the mid range of what VFD's can do?
If thats right i'm quite pleased as it was the same price as Huan Yang's but does seem to be better - it having programmable outputs/inputs etc.

Now onto getting my head around the braking resistor :?: :?: :?:

Thanks again Russ - anything I can help you with, you only have to ask :lol: :lol: :lol:
frijoli
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Re: Question for Russ and other VFD ninja's

Post by frijoli »

midy wrote: Wed Jan 03, 2018 11:44 am So it seems like sensorless vector conrtol is somewhere in the mid range of what VFD's can do?
If thats right i'm quite pleased as it was the same price as Huan Yang's but does seem to be better - it having programmable outputs/inputs etc.

Now onto getting my head around the braking resistor :?: :?: :?:

Thanks again Russ - anything I can help you with, you only have to ask :lol: :lol: :lol:
Sensorless vector is becoming more and more common and is a nice feature. It's like a pseudo closed loop system for speed control.
If you can add a breaking resistor to the drive, my opinion is to do it. You'll be amazed at how quickly you can stop a spindle.

Be aware that some of the cheaper Chinese drives say one thing, but don't really deliver. I believe the one on our milling machine is a Hitachi and can go from 4000RPM to zero in under a second.
Clay
near Winston-Salem, NC
unofficial ACORN fb group https://www.facebook.com/groups/897054597120437/
cnckeith
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Re: Question for Russ and other VFD ninja's

Post by cnckeith »

i agree, braking resistor is the way to go. it is safer to have the spindle stop quickly and is cheap and easy to do, every machine with a VFD should use an external braking resistor (and is good for Rigid tapping performance) just make sure your VFD supports a braking resistor, some china VFD's do not!
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html
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