In this lesson we ll examine a common industrial application of 2 wire control circuits known as a hand off auto circuit.
Hand off auto switch wiring.
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To be controlled by some automatic operation such as a sensor or plc plus allows you to easily turn the load on manually or off manually.
In this mode the fan will run continuously until the stop button is pressed.
Wiring diagram for a hand off auto switch travelwork for hand off auto switch wiring diagram image size 800 x 498 px and to view image details please click the image.
Inter lock normally closed normally open jog run a b a b off hand auto h1 h2 x1 x2 pt.
We ll discuss the devices that make.
It allows loads such as motors solenoid valves electric cylinders etc.
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Whatever controls the motor remotely needs to be a single pole two wire device that closes its contact when the motor is supposed to run.
This setup will cause both the motor and light to be energized when the switch is in the hand position.
Hand off auto hoa controls are a very common and versatile control circuit which allows both automatic and manual operation.
This permits the motor to be controlled by a start stop push button station.
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A modulating valve has a control switch labeled hand off auto located near the valve.
In hand the valve can be jogged open or close right at the switch.
They will also be energized when the switch is in the auto position and the remote switch is closed.
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These two wires go from the remaining nc terminal to the terminal with the blue wire.
When the hand off automatic switch is set in the hand position connection is made between terminals 1 and 2.