L17401-CL06JEN-E2-S02, REV. C INTRODUCTION TO TROUBLESHOOTING
Copyright © 2019 Amatrol, Inc.
S02-9
SKILL 2 TEST A MANUAL SWITCH
12. If you are using manual fault insertion, obtain an open fault plug and plug it
into the station fault terminal labeled 9 in place of the standard jumper plug.
If you are using the FaultPro software, type
9
in the Enter Fault fi eld and
press the
Enter
key or click
to activate the fault.
Fault 9 is now active. This will cause an open in the N.C. contacts of PB3.
This condition can occur if the contacts are mechanically broken or have be
burned open by excessive current.
13. Test the N.C. contacts of PB3 again. Record your results.
PB3 Resistance (not pressed) ______________________________ (Ohms)
PB3 Resistance (pressed) _________________________________ (Ohms)
Component Status ___________________________________ (Good/Bad)
You should fi nd that the contacts are now bad because the resistance reads
infi nite in both conditions.
14. Click the
Clear Fault
button to clear the fault or remove the fault plug and
replace it with the standard jumper plug.
The fault will clear and the fault status fi eld should change to “Fault 9 is
cleared.”
15. Now test the N.C. contacts of PB3. Record your results.
PB3 Resistance (not pressed) ______________________________ (Ohms)
PB3 Resistance (pressed) _________________________________ (Ohms)
Component Status ____________________________________ (Good/Bad)
The contacts should be good. This means the resistance should be zero when
not pressed and infi nite when pressed.
The faults you have seen so far in this skill involved pushbuttons. These same
types of faults can also occur in selector switches. In the remaining steps of
this skill, you will test a selector switch.
