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DPDT Switch Isolation


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pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: August 16, 2016 at 6:58 PM / IP Logged Link to Post Post Reply Quote pts760
I'm working on a R/V for a customer. I have two DPDT switches that I want to control the awning with (folds out and folds in). One switch outside and one switch inside the R/V (Just like a 3-way switch in the house). If I daisy chain the two switches, the switches rest at ground and the fuse will blow when one of the switches are engage. Am I overlookering my wiring isolating dilema, or is there a better way to do this?DPDT Switch Isolation - Last Post -- posted image.
I drink current, eat ohms, and bleed voltage
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: August 16, 2016 at 8:01 PM / IP Logged Link to Post Post Reply Quote Ween
Have the switches control relays. Remove the grounds from the switches, should have positive fold in and fold out. Wire relays to reverse polarity using positive trigger on coil. Switches are wired in parallel.
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: August 16, 2016 at 8:32 PM / IP Logged Link to Post Post Reply Quote pts760
That's funny because before you posted your reply I was toying around with that idea and I believe thats gonna be the winner. One more question for you? Its probbably not likely but it is a possibility, what if someone is holding the switch up outside and down inside? I was thinking about adding a ATC auto reset breaker for circuit protection? Thoughts?
I drink current, eat ohms, and bleed voltage
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: August 16, 2016 at 8:44 PM / IP Logged Link to Post Post Reply Quote Ween
If the switches are operated simultaneously, the motor would stop as it would have positive voltage on each of its leads. No protection needed, except the fuse/circuit breaker present there now...hopefully.
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: August 16, 2016 at 9:26 PM / IP Logged Link to Post Post Reply Quote pts760
Well I feel like a total idiot. Your right. Should have thought that one out a little more. thanx again for your help
I drink current, eat ohms, and bleed voltage
i am an idiot 
Platinum - Posts: 13,667
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 17, 2016 at 4:01 PM / IP Logged Link to Post Post Reply Quote i am an idiot
You have to use Momentary On-Off-On switches. If switches are used simultaneously and one tries to go in and the other tries to go out you will blow a fuse.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 17, 2016 at 4:07 PM / IP Logged Link to Post Post Reply Quote howie ll
Two momentary DPDT exactly the same as power window repeater switches in the good old days. Two SPAL switches in series, no relays unless the load exceeds 15 amps.
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: August 17, 2016 at 4:43 PM / IP Logged Link to Post Post Reply Quote Ween
I'm guessing that since the vehicle in question is a RV, he has the switces. They probably match other switches in said vehicle...which is why I used relays.
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: August 17, 2016 at 6:13 PM / IP Logged Link to Post Post Reply Quote pts760
Correct. I did already have the switches that rested at ground. The relays worked perfectly. Here's how it was wired.
DPDT Switch Isolation - Last Post -- posted image.
@ Howie II, I'm not familiar with those switches. Do you have a link that I could check those switches out for future applications?
I drink current, eat ohms, and bleed voltage
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: August 17, 2016 at 6:21 PM / IP Logged Link to Post Post Reply Quote pts760
Whoops. Diagram above is wrong. Correct Diagram:
DPDT Switch Isolation - Last Post -- posted image.
I drink current, eat ohms, and bleed voltage

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