I have an old swing gate opener with a bad control board, no longer available. I would like to design a circuit using the present motor and other parts that would allow the gate opener to function without an electronic control board. This circuit would be similar to the ones used in very early (70's or earlier) garage door openers having no "bells or whistles" (e.g. automatic timed closing, electronically-controlled auto-reverse, etc.)
The motor is a 1/2 horsepower capacitor-start reversible 110v ac motor with four leads. The opener employs micro-switches ("limit" switches) to stop the gate at its excursion limits (open or closed). The gate is activated by a standard single-button Liftmaster remote control unit which is "momentary on." I am looking for a circuit similar if not identical to what I see when I look at the circuitry inside my old 70's era Liftmaster garage door opener. This design has no control electronics, but naturally employs what I assume is a double-pole double throw latching relay(???) and a transformer is also present. Unfortunately I have no schematic, otherwise I could probably replicate the design myself.
The design I am seeking is obviously quite simple but I don't quite have the expertise to put it all together. Your help would be very much appreciated. Thanks very much.
The motor is a 1/2 horsepower capacitor-start reversible 110v ac motor with four leads. The opener employs micro-switches ("limit" switches) to stop the gate at its excursion limits (open or closed). The gate is activated by a standard single-button Liftmaster remote control unit which is "momentary on." I am looking for a circuit similar if not identical to what I see when I look at the circuitry inside my old 70's era Liftmaster garage door opener. This design has no control electronics, but naturally employs what I assume is a double-pole double throw latching relay(???) and a transformer is also present. Unfortunately I have no schematic, otherwise I could probably replicate the design myself.
The design I am seeking is obviously quite simple but I don't quite have the expertise to put it all together. Your help would be very much appreciated. Thanks very much.