pid duty cycle PWM

[JohnS11]

I'm trying to find example of pid controlling duty cycle of PWM. Is there any simple example? Help to share if have any.

I coundn't find any of that topic in the Example Finder

[jyang72211]

I found the attached in the example finder.  I only has proportional gain, but in the example, it says you can convert it into a PID. 

[JohnS11]

Agree,

[JohnS11]

but, how how to get the Ki, Kd in separate block?

Currently, under control and simulation> we can find the pid block (meaning one block contains kp, ki, kd).. How to make them piece by piece in labview?

[jyang72211]

Couldn't you set the factors that you don't need to zero?

[JohnS11]

I need all the parameters...kp, ki, kd in separate block....

if uses pid block(which found in control design & simulation), how to get the "error" which go inside the pid block?

Error = setpoint - feedback value

help to share.

[JohnS11]

probably i just use

mathematics> numeric > subtract the feedback value using the setpoint (outsidet the pid block)? Is it the righway?

[JohnS11]

Refer to the  http://digital.ni.com/public.nsf/allkb/1561D31534F07D608625727900391114

If make a little change there by inserting a PID block, PID output line go into the duty cyle line (meaning delete the manually key in duty cycle).  How to set the limit there as illustrated in the attached limit.PNG?

[JohnS11]

can use the In Range and Coerse feature for limit setting ?

[jyang72211]

I am not sure what you are asking...