Jogging or Inching
Jogging or Inching
Jogging or Inching
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F/R TROUBLESHOOTING<br />
Begin with the End in Mind<br />
• Review Chapter 10 questions<br />
• Chapter 9 and Chapter 10 will be<br />
combined f<strong>or</strong> one homew<strong>or</strong>k assignment.<br />
<strong>Jogging</strong> <strong>or</strong> <strong>Inching</strong> (1 of 2)<br />
• NEMA definition:<br />
– The quickly repeated closure of a circuit to<br />
start a mot<strong>or</strong> from rest f<strong>or</strong> the purpose of<br />
accomplishing small movements of a<br />
driven machine<br />
CHAPTER 10<br />
<strong>Jogging</strong> and <strong>Inching</strong><br />
Objectives<br />
• Define the term jogging.<br />
• State the purpose of jogging.<br />
• State difference between jogging and<br />
inching.<br />
• Describe the operation of a jogging<br />
control circuit using a select<strong>or</strong> switch.<br />
• Connect a select<strong>or</strong> switch.<br />
<strong>Jogging</strong> <strong>or</strong> <strong>Inching</strong> (2 of 2)<br />
• <strong>Jogging</strong><br />
– To start a mot<strong>or</strong> with sh<strong>or</strong>t jabs of power at<br />
full voltage<br />
• <strong>Inching</strong><br />
– To start a mot<strong>or</strong> with sh<strong>or</strong>t jabs of power at<br />
reduced voltage<br />
2/27/2013<br />
1
<strong>Jogging</strong> Circuits (1 of 6)<br />
• The STOP button prevents the holding contact from<br />
sealing the circuit. And will stop the mot<strong>or</strong> if it is<br />
sealed in.<br />
Jog= Stop + Start<br />
<strong>Jogging</strong> Circuits (3 of 6)<br />
• <strong>Jogging</strong><br />
accomplished with<br />
control relay:<br />
• <strong>Jogging</strong><br />
accomplished<br />
with a toggle<br />
switch<br />
(SPST):<br />
<strong>Jogging</strong> Circuits (5 of 6)<br />
<strong>Jogging</strong> Circuits (2 of 6)<br />
• <strong>Jogging</strong> accomplished with double action push button<br />
(a separate Jog Button):<br />
<strong>Jogging</strong> Circuits (4 of 6)<br />
• <strong>Jogging</strong> f<strong>or</strong>ward<br />
/reverse<br />
accomplished<br />
with control relay:<br />
• <strong>Jogging</strong><br />
accomplished<br />
with a select<strong>or</strong><br />
switch (DPDT):<br />
<strong>Jogging</strong> Circuits (6 of 6)<br />
2/27/2013<br />
2
<strong>Inching</strong> (Reduced Power)<br />
While <strong>Inching</strong> the<br />
Mot<strong>or</strong> is run with<br />
reduced current.<br />
<strong>Inching</strong> is<br />
frequently done<br />
using a Freq.<br />
Drive rather than<br />
Resist<strong>or</strong>s.<br />
Summary<br />
• In this chapter, we discussed:<br />
– The term jogging<br />
– The purpose of jogging<br />
– The difference between jogging and<br />
inching<br />
– The operation of a jogging control circuit<br />
using a select<strong>or</strong> switch<br />
– How to connect a select<strong>or</strong> switch f<strong>or</strong><br />
jogging<br />
What will this circuit do? (#3) This Circuit? (#4)<br />
2/27/2013<br />
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