What for the "D" in a PID control loop?

Started by George Herold in sci.electronics.basics8 years ago 13 replies
PID

I=92ve built several PID control loops, mostly for temperature control, but sometimes for other things. I=92ve always used the all three...

I=92ve built several PID control loops, mostly for temperature control, but sometimes for other things. I=92ve always used the all three PID parameters. I use to think that the D term was there to help reduce the ringing. (As stated in the wiki PID article.) And was needed to get critical damping of the loop. But this misunderstanding was corrected a few years ago by a colleague. F...


Scr firing

Started by Robotnik in sci.electronics.basics11 years ago 6 replies

Hello all, We have been trying to build a prototype of a single-phase power controller.The amount of power to be output is controlled by a...

Hello all, We have been trying to build a prototype of a single-phase power controller.The amount of power to be output is controlled by a PID algorithm. The PID algorithm resides in the external flash associated with a processor. The output from PWM module of the processor controls the firing of the SCR. Let me add that the input to the PID algorithm are the current temperature of the hea...


Pic Question - digital output on

Started by Dave in sci.electronics.basics11 years ago

For the first time I am working on a USB project using a PIC18F4550 chip. I have written firmware for the chip that was tested and works on a...

For the first time I am working on a USB project using a PIC18F4550 chip. I have written firmware for the chip that was tested and works on a development board... now I put together a circuit of my own and burned by firmware onto my own chip, and the whole thing enumerates when plugged into the PC with my own VID and PID, so I assumed the rest of my firmware would work too.... However my ...


Modern lithium-ion batteries protected against catastrophic failure?

Started by John Doe in sci.electronics.basics6 years ago 16 replies

I have this 36 V battery. http://www.boschtools.com/Products/Tools/Pages/BoschProductDetail.aspx?pid=BAT836 I would like to try electricly...

I have this 36 V battery. http://www.boschtools.com/Products/Tools/Pages/BoschProductDetail.aspx?pid=BAT836 I would like to try electricly splitting it into two parts and using each 18 V half individually. I have these things lying around and I need lightweight 18 V batteries. Do the individual lithium-ion cells have built-in protection against deep discharge, or is that probably don...


Meaning of Vce(sat)?

Started by Daniel Pitts in sci.electronics.basics4 years ago 18 replies
PID

I'm going to be using ULN2803APG in a design of mine, and I just noticed on the datasheet [1] that Vce(sat) typ is 1.3 at 350ma. Does that...

I'm going to be using ULN2803APG in a design of mine, and I just noticed on the datasheet [1] that Vce(sat) typ is 1.3 at 350ma. Does that mean that the voltage drop across the Vce will typically be 1.3 at that current? Or does that mean the voltage for Vbe needs to be that high to have saturation? [1]


PID tuning. Lag = ~ integrating time

Started by George Herold in sci.electronics.basics5 months ago 38 replies

Hi all, this is not so much a question, as me just spouting. If I do say (spout) something wrong, or that you disagree with or that you don't...

Hi all, this is not so much a question, as me just spouting. If I do say (spout) something wrong, or that you disagree with or that you don't understand, then please do speak up. I've been tuning loops for years. (By tuning I mean picking some reasonable starting values, all loops IME need a little real time tweaking from the starting values.) I've always used the Zeigler-Nichols...


New Web Site on Instrumentation Instroduced

Started by Anonymous in sci.electronics.basics10 years ago
PID

Instrumentation World provides information to engineers, professionals and everybody who is interested in Instrumentation,...

Instrumentation World provides information to engineers, professionals and everybody who is interested in Instrumentation, Process automation and control. We try to cover all topics related to Process Automation and Control, like Distributed Control Systems DCS, Programmable Logic Controler PLC, Batch Control, PID, Advanced Control, Measurement, Human Machine Interface HMI, Measurement, ...