Are the input ground and fan ground common?
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Are the grounds for the inputs and the fan outputs the same ground plane? Or, do they have separate ground planes?
I have a pushbutton with a lamp in it. I'm trying to decide if I can run one ground wire to the terminals, or if I should run two. (Two is obvious, if the i/o do not share ground planes...)
Thanks!
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Do you mean the GND connections for the "always on" fans?
The PWM fan connections FAN0- FAN1- and FAN2- are switched to ground via MOSFET (as I recall) devices - so they are not common with the input grounds.
Frederick
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Thanks, that answers my question.
Since I am using it as an indicator lamp, I do not need pwm, but I do need to be able to turn it off and on in the g-code.
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@tenaja said in Are the input ground and fan ground common?:
I do not need pwm, but I do need to be able to turn it off and on in the g-code.
Wel if you need it switchable, then the PWM outputs are your only option I think.
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@tenaja said in Are the input ground and fan ground common?:
Thanks, that answers my question.
Since I am using it as an indicator lamp, I do not need pwm, but I do need to be able to turn it off and on in the g-code.
IF the lamp is incandescent DO NOT DO THAT unless you know for sure the surge current will not fry the MOSFET.
Ask me how I know.
Frederick
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@fcwilt
Thanks for the heads up. My indicator is an LED lamp, but I'll keep this in mind for future projects.We're you able to replace the fet?
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@tenaja said in Are the input ground and fan ground common?:
@fcwilt
Thanks for the heads up. My indicator is an LED lamp, but I'll keep this in mind for future projects.We're you able to replace the fet?
I haven't tried - I used another unused fan output AFTER replacing the incandescent bulb with an LED.
Frederick
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@fcwilt Thanks for your help, I got it going. Although I was not intending to do so initially, I used my LED lamp on the fan port as a dual indicator rather than installing two, since I could dim the LED.
Thanks again!
