Thanks for the help. I should have done some basic research before posting.[blush]
The wikipedia articles referenced be GroovyGuy above, and the article on induction heating are most helpful.
Induction cooktops require ferromagnetic cookpots because they rely on a combination of eddy-current and...
As I understand it, if I heat a piece of brass or aluminium by placing it inside the coil of one of my royer oscillators, the field is inducing eddy currents in the brass which is then generating heat through resistive heating. The brass piece is acting exactly like a shorted single-turn...
I am playing around with induction heating at present.
I have a couple of Chinese-built royer oscillator drivers, one good for ~100W and its big brother (~1000W). Both of these will easily heat steel, stainless steel, copper, aluminium, lead, the 1000W driver even comes with a carbon crucible...
Eurotherm are a well-respected company with a great range of PID controllers.
We have used them successfully for many years.
They tend to be fully-featured and more expensive than some brands.
I would use a PT100 sensor. They are cheap, accurate, and in many applications they are the preferred sensor type.
NTC sensors are OK but can give accuracy issues, particularly if the length of cable between sensor and controller is long.
Thermocouples are great for higher-temperature...
Thanks, I was looking in the first instance for something off the shelf.
Yes, I could cook something up, but who would do that if there was something already available?
I have now found several options, and am sifting through them to find the best bang for buck.
Best options at present appear...
Hi,
I am building a new production line for the small electric heating factory that employs me.
This is a multi-station line where the heat pads are moved between stations as they are assembled, by a PLC control system.
The end station is a vacuum press where the heat pads are pressed, load...
Thermal fuses are quite readily available. Here in New Zealand, I can get them from RS Components, Element14, and even the local Jaycar store.
Do not be tempted to up-rate the temperature rating of the thermal fuse, it has been chosen carefully by the manufacturer to limit the chance of the...
I find with this question, that it is best to use one of the circuit-breaker trip-curve plotting apps that the various manufacturers have on offer.
I am currently using an application 'Curve Direct' from Schneider Electric, but have used similar software from GE and AB which gives the same...
Did this myself just over 40 years ago for a high school science project.
Back then, LEDs were fairly new and something of an unknown quantity.
We started with a simple incandescent torch lamp as the emitter, and one of the old-type germanium transistors with the painted glass envelope scraped...
With devices such as LED drivers, the issue is not so much the displacement PF which as we have seen is a charming 0.95.
The issue, if there is one, is the distortion introduced by the driver only drawing current at the peaks of the ac wave.
So the answer is resistive, but decidedly non-linear.
Oops, I fear I spoke too hastily. That bit index doesn't work, does it? Sorry about that.
I fear that you will have to write yourself a wee function block to do this. Translate your DINT into an array of bits which you will be able to index.
The MCB should be selected so that its KA rating is at least equal, and preferably higher than the (calculated or measured) prospective short-circuit fault current (PSSC) of the supply.
Industrial installations tend to have power supplies with high PSSC, hence the need for higher-rated circuit...
