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DOUT voltage when not enabled

Kai Rasporich 6 months ago in Master modules / MC4x • updated 4 months ago • 2

Hello,

I am having some trouble with the Parker MC41. I have a display button on another MD4 that enables / disabled the output on Pin 45 (DOUT-HS). I am seeing a proper system voltage of 12.26V when the value is true, however when I set it to false Pin 45 goes to 11.68V. Is this normal behavior? Should I have some sort of diode in there to get the desired on/off I am expecting?

Thank you.

+1
Michael Carlyle 6 months ago

The leakage current for the MC4X's is very high to allow for error checking (open load etc.) If there's no load there - the leakage current will give you almost system voltage.  We had to use the HS+LS outputs for very low current (solid state devices) or use a high side and a low side output with opposite logic connected together (to ground the output when off) if you want to pass use an output to send to another computer system.

Kai Rasporich 4 months ago

Thanks for the information. I'm not able to figure out how to have an independent LS output on the MC41, is it not supported? 

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