Motor control

1. JOGGING OPERATION
FOR DC AND AC MOTORS

2. Jogging
• Jogging refers to repeated starting and
stopping of a motor in short bursts to
perform a particular movement such as
moving a crane to a particular location. The
motor is operated on full power.
• Jogging is moving the motor in small
increments.

3. Inching
• Inching is similar to Jogging and the two
are often confused with each other. Inching
involves short thrusts of motion at reduced
power. The motor is made to run at a
reduced voltage.

4. Jogging and Inching
• The definition of jogging or inching as described by
NEMA is "the quickly repeated closure of a circuit to
start a motor from rest for the purpose of
accomplishing small movements of the driven
machine." The term jogging actually means to start a
motor with short jabs of power at full voltage. The
term inching means to start a motor with short jabs of
power at reduced voltage. Although the two terms
mean different things, they are often used
interchangeably because both are accomplished by
preventing the holding contacts from sealing the
circuit.

5. Jogging Operation
• Jogging should not be done more than
5 times in a minute. This is because jogging
can cause the motor to overheat.
• If Jogging is to be done frequently, the
starter of the motor should be derated.

6. Jogging Operation in AC motor
• Can be operated by using a Simple Push
Button, or a Control Relay, or a Selector
Switch
• Repeated starts and/or jogs of induction
motors generally reduce the life of the
motor winding insulation. A much greater
amount of heat is produced by each
acceleration or jog than by the same motor
under full load.

7. Application or Purpose of jogging a motor
• The purpose of jogging a motor is to align some
other part of a machine or to slowing advance a
machine through its sequence of operation. This
is usually done during a repair or maintenance
operation. An example of jogging or bumping a
machine might be when greasing linkages the
machine is bumped over so as to position the
linkages for access so they can be greased.

8. Start-Stop Control Circuit

9. Start-Stop-Jog Control Circuit

10. Video Presentation
• To Sample Video…

11. THE END
Prepared by: Ayen, John Mark I.
Villamora, Elmer R.

12. SHORT QUIZ

13. Questions:
• Explain the difference between inching and
jogging. (3pts)
• What is the main purpose/application of
jogging? (2pts)
• What is the switch used in start-stop-jog?(1pt)
• Draw the Start-Stop-Jog Control Circuit(ladder
diagram).(4pts)

14. PASS YOUR PAPERS
Thank you!!!

15. ATA IPASA NA YAN…!