Oh Electronics

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Mr.StickyFingers

Active Member
Ive contstructed...well began contstructing a 2x2x1.5 box with a 400w hps and keeping it cool may bring a challenge. Although I had a few fans to get some fresh cool air in and the hot hps air out, I fear that if thye were to ever malfunction one day, it may melt from the heat. Anyone savvy with electronics who can offer any advice or even better, an idea as to how I could set my light to sense if the fans die and shut off? I appreciate all help, happy new year folks.
 
BigBudBalls

BigBudBalls

Well-Known Member
Mr.StickyFingers said:
Ive contstructed...well began contstructing a 2x2x1.5 box with a 400w hps and keeping it cool may bring a challenge. Although I had a few fans to get some fresh cool air in and the hot hps air out, I fear that if thye were to ever malfunction one day, it may melt from the heat. Anyone savvy with electronics who can offer any advice or even better, an idea as to how I could set my light to sense if the fans die and shut off? I appreciate all help, happy new year folks.
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Is that meters or feet?
If feet, thats a dang small box.
400W should be sealed and cooled with the air outside of the box. The box will still heat up from radiated heat. So you will need to vent the box also.

Could put in a switch/sensor that if the lamp fan fails, it kills the light.
 
A

Atarijedi

Well-Known Member
Mr.StickyFingers said:
Ive contstructed...well began contstructing a 2x2x1.5 box with a 400w hps and keeping it cool may bring a challenge. Although I had a few fans to get some fresh cool air in and the hot hps air out, I fear that if thye were to ever malfunction one day, it may melt from the heat. Anyone savvy with electronics who can offer any advice or even better, an idea as to how I could set my light to sense if the fans die and shut off? I appreciate all help, happy new year folks.
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The easiest way would be to wire a relay/contactor in series with the fans. The relay would control the ballast. So just like your christmas lights, if one of your fans go out, anything behind it (the relay and thus the ballast) would shut off. Make sense?
 
BigBudBalls

BigBudBalls

Well-Known Member
Atarijedi said:
The easiest way would be to wire a relay/contactor in series with the fans. The relay would control the ballast. So just like your christmas lights, if one of your fans go out, anything behind it (the relay and thus the ballast) would shut off. Make sense?
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No. Almost a fire hazzard in its self.
How does the fan go 'out'? Locked spindle? AC is still flowing.
Series also does strange things with voltage drops.
 
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