Undervoltage protection and three wrre control should brmg to mrnd a start stop push button staton whrch the most common means of provrdrng this type control. Looking at a stop start jog circuit in the plc will help us in understanding the differences in hard wiring the circuit and programming.
Ladder Logic For Special Motor Control Circuits Jogging And
Start stop jog motor control diagram. For push button control stations 7 start stop control wiring diagrams single station with motor stopped pilot light l1 start l2 i 1 stop 2 oi 3 n wol. The jog circuit can be used in almost any control circuit because it relies on momentary energizing and de energizing of the pilot device. See image below for an example of 3 wire control being used to pull in a contactor to start a 3 phase motor. Physical switches wired to outputs devices such as motor contactor and relays. When you press the start button and the stop button is not pressed the 24vdc relay energizes and it pulls in the r1 contactor that feeds three phase power to the motor. Control circuit until the start button is pressed once again.
The most common use of 3 wire control is a startstop control. T w 6. The start and stop operation of the jog motor control is the same as the start and stop operation of the across line magnetic starter. To jog the motor simply hold down the stop button and jog the circuit by pressing the start button. In a jog motor control a dual push button with one normally motor control open and one normally close contacts is inserted in between the normal stop and start push button of the across the line magnetic starter. Pilot light l2 4 2 3 pilot light start stop bulletin 1495 normally closed auxiliary contacts are required.
Motor control jog circuit diagram. Jogging or inching is defined as the quickly repeated closure of a circuit to start a motor from rest for the purpose of accomplishing small movements of rotating machine. C i m nc. With the motor running contacts are open. Here is what it looks like hard wired. Ladder diagram basics 3c 3 wire control duration.
Start stop and jog. L3 t3 t three wires three wjfes lead from the plot devtce to thestarter. The following diagram is shown for 3 phase motor control of a delta star connection. It uses three contactors an overload relay one auxiliary contact block a normally open start pushbutton a normally closed stop pushbutton an on delay timer of 0 20 seconds and a power supply with a fuse. Motor starter with start stop and jog. This video builds on the standard 3 wire circuit by incorporating multiple stopstart stations.
Wye delta open transition 3 phase motors. Lets start with the basic stop stop circuit. This circuit is basically a start stop push button control circuit that has been reconnected so that the start button is in parallel with both the stop button and holding contact.
Gallery of Start Stop Jog Motor Control Diagram
