L contact blocks are shown in their normal position.
Hand off auto switch contacts.
In hand the motor would run continuously and in auto the motor would start and stop by a plc or other controller.
The switch is a three position switch that can be used to manually change the direction of rotation of a three phase motor.
Black selector switch attached to a mounting base 1 n o.
4 position is blank.
Select an operator prefix from table 1 on page 9.
Select a maintained 3 position hand off auto selector switch with standard knob and three circuits as shown.
Xo x oox xo o 1.
Contact position on a selector switch can easily be illustrated using truth tables.
Code kc1 or kc7 would be equally effective.
The included legend plate establishes two selections for activating a process and one to turn off all functions.
Consider a second example.
2 position marked off on and blank on other side.
The flow switch shown in figure 27 2 employs two separate contacts one normally open and the other normally closed.
3 position marked hand off auto and blank on other side.
A modulating valve has a control switch labeled hand off auto located near the valve.
Select a cam and index code from table 2 on page 9.
In hand the valve can be jogged open or close right at the switch.
Contact hand off auto legend plate.
Selector switch 3 position 30mm knob maintained nema 4 13 selector switch 3 position 30mm knob black with white insert kb7 cam 1 normally open 1 normally closed contact blocks nema 4 13 available in select areas.
Choose from our selection of hand off auto switches including metal 30 mm panel mount lever switches steel enclosed lever switches and more.
A typical hand off auto control operation typically requires a how many position selector switch with how many contacts.
Use kc1 for this example.
Identify the following switch symbol.
Oil tight watertight and dust proof.
Heavy duty selector switch for industrial applications.
Draw and label the nema sybols for both a two position off on selector switch and a three position hand off auto selector switch.
M short style operators are suitable for class i group c d class ii group e f g only.
Learn how this truth table illustrates the manual or automatic contact po.
