Hand off auto hoa controls are a very common and versatile control circuit which allows both automatic and manual operation.
Hand off auto switch wiring.
In auto the valve position is set by a plc analog output remotely.
Inter lock normally closed normally open jog run a b a b off hand auto h1 h2 x1 x2 pt.
In this lesson we ll examine a common industrial application of 2 wire control circuits known as a hand off auto circuit.
They will also be energized when the switch is in the auto position and the remote switch is closed.
Switch three position two wire pilot devices transformers low voltage control transformer reset 98 ol 97 96 95 t c.
April 2007 basic wiring for.
A modulating valve has a control switch labeled hand off auto located near the valve.
It allows loads such as motors solenoid valves electric cylinders etc.
In hand the valve can be jogged open or close right at the switch.
These two wires go from the remaining nc terminal to the terminal with the blue wire.
In this mode the fan will run continuously until the stop button is pressed.
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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.
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Hand off auto wiring diagram electric hand off auto switch wiring in hand off auto wiring diagram image size 650 x 388 px.
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This permits the motor to be controlled by a start stop push button station.
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.
When the hand off automatic switch is set in the hand position connection is made between terminals 1 and 2.