Near Intersection of I-35 & I-90 Southern Mn. | WildBuckwheat - 10/31/2014 08:44
Found a pen and pencil crayon.
After analyzing this diagram I agree that this should work and would eliminate the need and possible confusion of using the diodes. This would require 4 wires between the switch and the actuator location but that is minor.
My idea of using diodes was to analyze the circuit board used by Raven and others in their butterfly control valves. The limit switches are operated by a cam on the butterfly shaft and stop the action at the extremes. Diodes are installed across these limit switches to allow the reverse polarity to start the action in the reverse direction. Once the reverse action allows the limit switch to reengage, the voltage drop across the diode is not longer present and the motor speeds up slightly.
Thanks for the correct terminology of an H pattern. The criss-cross description was my own terminology since that is how I think of it.
For those that are confused by diodes: A simple comparison is to think of a diode as a check valve in plumbing systems. With a check valve, flow is blocked in one direction but allowed in the opposite direction with a slight pressure drop. This is what happens with a diode as well. Electricity is blocked in one direction but allowed in the other direction with a slight drop in voltage.
Edited by tedbear 11/2/2014 06:44
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Linear actuator limit switch wiring? How to?
