OT: Help with 12v solid state relay


 
The 12v is just to trigger the relay. The motor requires 120V AC and utilizes both the NO and NC contacts for up/down functionality.

Yep, need a n-channel mosfet for this.
 
The MOSFET solution seems to be working well.

Thanks!

Update: I just heard the screen lower and raise on it's own. Something's amiss somewhere.

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So at about 6:00am I was woken up by the the loud stuttering sound of the screen motor rapidly switching between up and down. The load side of the relay now looks to be stuck in the "on" position. The relay coil is still trying to change modes, but nothing happens on the load side.

Edit: just tested the relay and it's switching the load side properly. I've got it hooked up again to see what happens.

I'm using an IRFZ44N mosfet.
 
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Looks like my problem was due to a shoddy soldering job. It looks like the drain and source on the mosfet were sporadically shorting out allow the current to flow to the relay. I cleaned up the spacing between the connections and it's been running trouble free now.

I thought my soldering iron was too hot, even at the lowest level, as I was having a hard time keeping the solder on the tip. Turns out the temp control potentiometer isn't doing anything and is sending full power to the iron. Guess I know what my next project is!
 
Steve_M said:
Looks like my problem was due to a shoddy soldering job. It looks like the drain and source on the mosfet were sporadically shorting out allow the current to flow to the relay. I cleaned up the spacing between the connections and it's been running trouble free now.

I thought my soldering iron was too hot, even at the lowest level, as I was having a hard time keeping the solder on the tip. Turns out the temp control potentiometer isn't doing anything and is sending full power to the iron. Guess I know what my next project is!
Click to expand...

Awesome! Out of curiosity, do you even need the relay if the 12v is just triggering the 120v AC motor? It's possible you could just use the mosfet to trigger it plain and simple and remove 1 part of the equation.
 
Brandon N said:
Awesome! Out of curiosity, do you even need the relay if the 12v is just triggering the 120v AC motor? It's possible you could just use the mosfet to trigger it plain and simple and remove 1 part of the equation.
Click to expand...

Yep, the mosfet is triggering the relay, which is doing the real work by flipping the common 120v line between the up and down wires.
 
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