As it said. We need to replace some analog PID boards due to supply and side effects the existing ones have.
The PID code that comes in digital drives and process controllers are pretty much what we're looking for how ever, we only need just a design that allows a input ref, reference feed back and a output to drive what ever device. This device should have it's own mini LCD interface to set the values or at least a computer hook up to do so.
It should have the standard Proportional Gain, Integral and derivative components to set the values.
Also, having an option to select unipolar and bipolar output is a plus!..
I know there are various analog boards out there already that do this how ever, We have found that they seem to exhibit side effects and cause self oscillation under some conditions.
In the digital varieties, I have found this not to be a problem because it's being done via software and thus these effects are not visible.
I have already made a few using a AVR/ATMega that employ the ADC inputs and we simply buffer the output into a PWM filter and op-amp. These units are programmed via a serial connection for the params.
How ever, my employer wants to buy units that are ready made so that replacements can be had with out depending on in-house designs.
I have looked and I can't find a unit that has a build on LCD display with a simple interface to do this..
We do have a SSD out board key pad unit that does do this function for us along with some other little nifty things how ever, it appears that this unit is no longer available.
Any idea's?