Near Intersection of I-35 & I-90 Southern Mn. | Hay Hud Ohio - 10/31/2014 04:55
That takes care of powering both ways but has no provision for the limiting, I too am unsure on how to add in limit switches. What you are looking for Don is a DPDT MOM, double pole double throw momentary on- off- momentary on. Wire power in +on the left and - on the right both on top, jumper these to opposite sides on the bottom and motor wires in the middle, this gives you up and down functions but no limiting, you are going to need something on the actuator or the gate to break the circuit when it reaches whatever limit you want, a NC switch, normally closed, this may need to go to a relay. It can't be that hard, windows work that way with internal limits.
This wiring is what I refer to as the Criss-cross style with a DPDT switch. With the switch in middle nothing happens as the actuator doesn't get power or ground. With the switch UP the actuator gets power and ground and the actuator moves. With the switch DOWN the actuator gets ground and power so the actuator moves the other direction. As mentioned this causes the correct activity but does not provide for limits on the extremes.
This can be provided by limit switches which are independent of the above. A limit switch can be made with a normally closed switch mounted at the end of the stroke. When the actuator is fully extended, contact is made to this switch which stops the action. The problem is that the actuator can not be run backwards to shorten the stroke since this switch is breaking the connection. The trick is to use a diode across the connection that will allow the reverse current to flow. A similar arrangement can be used on the fully retracted end of the stroke.
This is probably confusing when explained in words. A diagram would be helpful but I don't have the time right now. |
Linear actuator limit switch wiring? How to?
