powering three electric fans

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paddlenbike

Member - Posts: 8

Joined: November 27, 2006

Location: United States

Posted: July 25, 2011 at 10:39 AM / IP Logged

Hi,

I could use some assistance with a wiring project I have before me. I have a rotary switch with off-lo-med-hi settings and I want to power 3 separate fans in this orientation: "low" on the switch turns on one fan, "med" on the switch runs two of the fans and "hi" runs all three fans. This is a 12V DC system on a boat.

I am familiar with how to use relays but this project has me stumped. Any replies are greatly appreciated.

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 25, 2011 at 3:24 PM / IP Logged

Do you have a rotary switch? This will be an easy task with the switch and a few diodes and the 3 relays. I can draw you a diagram tonight.

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dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: July 26, 2011 at 6:22 AM / IP Logged

Yeah, pretty simple with the rotary switch and a couple diodes, just wire the relays to each switch position, and add a couple of diode connections from switch terminal HI to MED, and from MED to LO.

Whenever the switch is a certain speed, the diodes will feed the next lower speed relay.

MED will feed the MED directly, and feed LO through the diode.

HI will feed HI directly, and feed MED through the second diode, which in turn feeds LO through the first.

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powering three electric fans

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