L17401-CL06JEN-E2-S02, REV. C INTRODUCTION TO TROUBLESHOOTING
Copyright © 2019 Amatrol, Inc.
S02-4
SKILL 2 TEST A MANUAL SWITCH
D. Press and hold the pushbutton and then record the resistance.
PB1 Resistance (pressed) _______________________________ (Ohms)
If the pushbutton is good, the resistance should be at or near zero. This
shows that the contacts are closing when the operator is pressed. This
pushbutton is good.
On a machine, these measurements are made by placing the multimeter
leads on the pushbutton’s N.O. contact block, as shown in fi gure 2-3.
NOTE
The contact blocks for the pushbutton switches and the selector switch
simply snap into place. This makes them easy to replace when necessary.
Figure 2-3. Actual Measurement of Contacts
5. Perform the following substeps to insert a fault into PB1 in the single fault
mode and test it.
A. If you are using manual fault insertion, obtain a short fault plug and plug
it into the station fault terminal labeled 6 in place of the standard jumper
plug. The station fault terminals are located on the back of the station
panel. Then, skip to substep J. If not, continue with substep B.
COM
Ω
Ω
N.O. CONTACT
BLOCK
