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.
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.
In auto the valve position is set by a plc analog output remotely.
In this mode the fan will run continuously until the stop button is pressed.
Inter lock normally closed normally open jog run a b a b off hand auto h1 h2 x1 x2 pt.
A modulating valve has a control switch labeled hand off auto located near the valve.
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This permits the motor to be controlled by a start stop push button station.
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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.
We ll discuss the devices that make.
It allows loads such as motors solenoid valves electric cylinders etc.
Hand off auto hoa controls are a very common and versatile control circuit which allows both automatic and manual operation.
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.
They will also be energized when the switch is in the auto position and the remote switch is closed.
In hand the valve can be jogged open or close right at the switch.
When the hand off automatic switch is set in the hand position connection is made between terminals 1 and 2.
Hand off auto wiring diagram electric hand off auto switch wiring in hand off auto wiring diagram image size 650 x 388 px.
This setup will cause both the motor and light to be energized when the switch is in the hand position.
April 2007 basic wiring for.