Re: inductive or resistive load

Cepowak wrote:

Hi, all. This is my first post in this group.
I'm trying to make a board for controlling AC loads. I mean to be
able of swithing on/off the AC power supply. I have seen a lot of
examples around the internet, and most of them use the typical I/O pin
+ opto-triac+triac, for example, this one:

http://www.iearobotics.com/personal/ricardo/proyectos/opto-triac/download/opto-triac-sch.pdf

I made a very similar board but it didnt work and i dont know why. I
used MOC3011, BT16A, and a GPIO from a microprocessor.I would like to
be able of a remote turning on and off some of the equipments of my
lab, and most of them are powered by classical AC/DC adaptors, so I
want to turn on and off the AC input of every adaptor of the
equipments. The first question is: what kind of load is an AC/DC
adaptor, assuming that the total consumption of the equipment that it
feeds is about 50 watts: inductive or resistive? Since they usually
have a transformer as the first component that sees the AC input, I
supposed it's inductive... am I right?
Another question about the triggering. If the led is always lightning
(feeded by a gpio, for example), the final triac should be at on-state
so that the adaptor would be powered on? A while after, if I drive low
the gpio turning off the led, should the adaptor power off??? Is it
an optimal approach for this problem? What is the real benefit of
using zero crossing detectors? I read a lot about controlling the
amount of power given to lamps or other devices, but i dont want
controlling the amount, but only the on/off state.

Thanks in advance.
first thing you must do is place a volt meter across the LED diode of
the isolator.. See if you're getting the required drive voltage.
Also, I assume you're leaving the trigger signal on at all times until
you want to turn it off ?
Putting that aside, you may also want to check a couple of other things, and that is the resistor you have going to the coupler that
drives the gate.. The gate current needed for trigger may be more than
what your giving it.

Things to ponder on..


--
"I'd rather have a bottle in front of me than a frontal lobotomy"
http://webpages.charter.net/jamie_5

.

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