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