Join Date: Mar 2002
Location: Austin, TX, USA
Re: Help Designing Relay Circuit
I'm not sure I interpreted your description of the switches in your circuit, but wanted to clarify the need for limit switches. When the doors are fully open or closed they should trip a limit switch to open the motor circuit. The switches are momentary single pole double throw. The normally open contact (N.O.) has a diode accross it so that you can reverse the polarity and drive away from the limit switch.
The relays will need to be wired somewhat like a flip-flop circuit with the motor connected to the common switch contact of each relay. I'll have to give some thought to the relay wiring. It would be ideal if the relay coils were only energized while the motor was moving. Perhaps you can search the electrical forum for an OEM circuit. It'll probably involve two relays, and perhaps a couple of diodes to work as you desire.
Hope that gives you part of what you're looking for at least.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI