heater controllers

[sunny dee]

I'm setting up some PID controlled heaters that use a PWM wave to open and close the relays to the heaters and I'm just wondering:

I have my PID.vi which takes as input the control variable, and the setpoint and from that it gives an output. Once the heater is at the right temperature, do I want the output to be zero, or will I want it to produce a PWM wave of perhaps 25% duty cycle to keep the heater at the right temperature? (ie: do I need to take into consideration keeping the heater heated, or will the PID.vi do all that for me?)

Thanks!

Sunny

[Conseils]

The PID will switch the heater on and off as required even when and after it has reached the set point.

Have you figured out how to tune your PID yet....

It won't just work out of the box, you will have to set the parameters for control.

P.S.
I note that you haven't rated a single answer yet, perhaps that's why it took so long to get an answer.
I am sure its just an over sight and you will find a minute or two to reward in some small way all those who have taken time to help you out......