On 10/08/2012 2:44 PM, Neil wrote:
> Hi all,
>
> I am trying to figure out how to use/control a motor controller, that's
> already wired into an oven for convection air flow.  The controller
> takes 240VAC and controls two 24VDC motors wired in parallel.  The
> motors need only to be run in one direction, but need to be variable
> speed.  See here... http://www.veisystems.com/nose/other/APS-MC-02.jpg
snip
> The optos have a 50mA max forward current rating, so I suspect I can
> send it say a 10mA signal, but I'm not sure if this can be continuous,
> pulsed, maybe at some specific frequency, etc.  Yes, I can just replace
> that part if I fry it, but I'm trying not to tinker with this oven too
> much as it's 220VAC that I have a (healthy) fear of.  So should I try
> (risk?) sending it a varying pulse from a function generator?  Or is
> there something else I should investigate first?

Maybe apply a low-ish frequency (a few 100 Hz) to the opto (via a 1K=20
resistor) from the CMOS output of the function generator and vary the=20
duty cycle to see what happens?
David...

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___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
___________________________________________

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