elec Fan

Alex1380 · Post by **Alex1380** » Sun Jul 27, 2008 8:04 pm

Is it possible to get the Mj v4 to controll a electric fan, running off a relay of course. Now i know i could do it using the RPM as a trigger say comming on a 500 to 3000rpm then switching off but can i use the fancy new temp input to tricker one of the user out put at a certain temp??

Thanks

pristic · Post by **pristic** » Mon Jul 28, 2008 7:12 am

x 2 on this.

I have thought about it and read that it can be done - Anyone written a 'How To' on this

Peter

DannyP · Post by **DannyP** » Mon Jul 28, 2008 7:36 pm

I guess my question is why would you want to do this? What I mean is why have a fan turn off/on at certain rpm? If you want it temp controlled, you can do that easily with a thermoswitch and a relay.

pristic · Post by **pristic** » Tue Jul 29, 2008 6:46 am

No I think both of us want it to come on based on temp and dont know how to use the input (maybe thats a statement only for me)
My question is 'How do I control a elec fan based on temp sender and relay - ie/ Any instructions to set this up.

Forget based on RPM, I dont need that and am assuming that Alex doesnt need that either but knows how to do it.

Cheers,
Peter

Alex1380 · Post by **Alex1380** » Tue Jul 29, 2008 4:47 pm

DannyP wrote:I guess my question is why would you want to do this? What I mean is why have a fan turn off/on at certain rpm? If you want it temp controlled, you can do that easily with a thermoswitch and a relay.

basicly why buy a bit if the mj can do it. Just want to try and make the most out of the MJ unit. it seems to come down to if the software can be made to switch a use an output on by using a single from a input as a trigger.

Patriq · Post by **Patriq** » Tue Jul 29, 2008 5:16 pm

Isn't it as simple as to wire a user output to a relay - and set the user output to switch on at a choosen temperature ? And have this relay run the fan.

DannyP · Post by **DannyP** » Thu Jul 31, 2008 7:05 pm

Alex1380 wrote:
DannyP wrote:I guess my question is why would you want to do this? What I mean is why have a fan turn off/on at certain rpm? If you want it temp controlled, you can do that easily with a thermoswitch and a relay.
basicly why buy a bit if the mj can do it. Just want to try and make the most out of the MJ unit. it seems to come down to if the software can be made to switch a use an output on by using a single from a input as a trigger.

You are making a simple thing more complicated, you need a temp sensor and a relay anyway. The only reason to run it through MJLJ is for datalogging.