AC coils in multisim

Relays in Spice are just (DC) voltage-controlled switches. For AC just write your own behavioral model ;-)

Or just add a peak detector in front of the relay model.

...Jim Thompson

Thanks, but I'm only new to Multisim (or simulation software of any kind), so I would have no idea how to do either of those.

Regards, Chris

PEAK DETECTOR....

(DIODE) AC----|>|----+-------+-----? DC OUTPUT | | C R | | | | GND GND

I hate ASCII ;-)

...Jim Thompson

Jim Thompson a écrit :

Oh, one ascii drawing, that's not only conceptual but also works ?-)

Do you have any component value?

Diode: 1N4148, 1N4001, what have you Capacitor: 1uF Resistor: 510K

...Jim Thompson

Jim Thompson a écrit :

It's rather arbitrary... choose your ripple... what's in your junk box... 470K ?:-)

...Jim Thompson

Jim Thompson a écrit :

Not 470K anymore. These were carbon comp and have drifted a lot... I'd prefer an adjustable cap, but I can't find the model for a 1uF+ one. Oh, and the dial is really ugly.

kind),

That's some simulator... can't set values ?:-)

...Jim Thompson

Jim Thompson a écrit :

kind),

Hmmm, got you. I'll check if I can file the resistor down.

On Tue, 12 Sep 2006 18:59:13 +0200, Fred Bartoli

Surely, you'd file a resistor up (in resistance), not down. Sheesh, beginners!

Richard Kanarek a écrit :

I was of course speaking of diameter :-)

But now you remind me, I'm sure I have somewhere one of those (pretty rare) thickening files, so I could go either way.

I don't suppose anyone knows where to find a model for an AC relay ? Adding components to recifty it isn't going to help because the same live wire feeding the relay coil is also used to supply power to devices attached to the relay..

What I'm trying to simulate is the time delay relay from this diagram (a

The idea is that the relay stays closed for about 1.5 - 2.5 seconds after power is removed from the coil.. this is meant to hold the solenoid down long enough for a can to roll out of the machine.. without the cap, resistor and diode the relay cuts out way too fast and the solenoid springs back up before the drink can roll out..

The schematic is hand drawn by myself based on a very worn and faded diagram and a visual inspection of the wiring. I think the order of the components for the time delay is wrong because I get no voltage across the coil, and if I measure between one side of the coil and the diode, I get 56V AC.. The original relay was worn and the cap was leaking so I decided to replace it.. but it doesn't work..

Any help would be great.. if I'm in the wrong group then kindly point me in the right direction..

Regards, Chris