Programmable Logic Controller Basics

EET3370 LAB 2

Name

START-STOP-JOG

One of the most common motor control circuits is the start-stop-jog. Jogging is a brief energizing of a motor to accomplish small movements to align or position the device controlled by the motor. Jogging is frequently used to operate such devices as overhead cranes.

The schematic given on the next page has two different start-stop-jog controls. Wire the entire control scheme as given. Do not wire the power three-line portion. Operate the controls in box #1 to examine the first set of controls and how they operate, then operate the controls in box #2 to examine the second set of controls.

When you have completed the above, answer the questions below and turn in your lab with your name at the top. Disconnect your circuit and put the trainer away before you leave.

1. What is the difference between the two start-stop-jog controls?

2. Circle with a solid line the portion of the schematic which constitutes the power three-line.

3. Circle with a dotted line the portion of the schematic which constitutes the control.

4. Would you use a programmable control for this circuit? Why or why not?