variable frequency driver control by analog voltage output

[GerdW]

Hi sobansair,

kindly send me your vi to generate analogue output voltage signal to run vfd at certain speed.

Who is "you" you are asking for a VI?

Why don't you use one of those DAQmx example VIs you can find in the example finder?

Which VI are you interested in?

That image in message #8 is actually a snippet: you can easily create a VI from it. (Read the announcements in the header of the LabVIEW board to learn about that!)

Edit:

Please stick with just one thread. Create your own thread if neccessary. And posting its email address in public boards is screaming for SPAM…

[sobansair]

sir, i am newcomer and learning about labview and data acquisition.

i am using parker and abb vfd drives to control motor speed. In vfd i am using pid application macro for feedback.

to give vfd analoge process setpoint input . i have to generate analogue voltage.

i need help to convert rpm setpoint into analogue signal. i have ni cdaq 9174 and ao modules.

[GerdW]

Hi sobansair,

i need help to convert rpm setpoint into analogue signal.

Most often this is very simple math!

Which voltage range does your VFD expect for its analogue input and which speed range is associated to that voltage range?

[sobansair]

rpm range 0-3000

voltage range 0-10v

[GerdW]

Hi sobansair,

so what is the math behind those numbers? It's pretty easy!

(The process is called "scaling".)

[sobansair]

1volt =300rpm

but how to use in labview.

[crossrulz]

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@sobansair wrote:

1volt =300rpm

but how to use in labview.

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So V = RPMset / 300.  You do know how to use the Divide function, right?

[newbieeng]

Hi,

As it was told by GerdW previously, the better way to do it to study example VIs releated to hardware analog generation signals. My code was complex and it may not be suitable for your application. 

Best regards.

[sobansair]

hi i am new to learn labview.

i have developed a vi for feedback control for motor.

when do it run  program to count only rpm of motor via incremental encoder it does work well

when do i give setpoint analogue voltage output signal to vfd AI 0-10v it does work well.

but when i use PID for feedback as shown in attached file.The pid vi icon doesn't pass signal to analogue output daqass which in reply doesn't start motor. 

anyone can help me in this regard or share his vi?

[sobansair]

i have developed a vi for feedback control for motor.

when do it run  program to count only rpm of motor via incremental encoder it does work well

when do i give setpoint analogue voltage output signal to vfd AI 0-10v it does work well.

but when i use PID for feedback as shown in attached file.The pid vi icon doesn't pass signal to analogue output daqass which in reply doesn't start motor. 

anyone can help me in this regard or share his vi?