Perkins 1104E Series Troubleshooting Manual page 210

210
Troubleshooting Section
Test Step 5. Measure the Resistance
of the Cables at the Machine Interface
Connector (MIC)
Illustration 120
A. Turn the keyswitch to the OFF position.
B. Connect the cables to the suspect switch.
C. Disconnect the P20:11 set speed control resume
or accelerate switch from the P20/J20 Machine
Interface Connector.
D. Measure the resistance from P20:11 set speed
control resume or accelerate switch to P20:37
Switch Return.
E. Perform the same procedure with the following
MIC pin connections:
•
P20:19 Set speed control speed 1 or speed 2
•
P20:20 Set speed control set or decelerate
•
P20:28 Set speed control ON or OFF
•
P20:29 Set speed control clutch or brake
disengage
Expected Result:
The measured resistance should be less than 10
ohms with the switch ON.
The measured resistance should be more than 2000
ohms with the switch OFF.
Results:
•
OK – Proceed to Test Step 6.
•
Not OK – There is a problem with the wires
between the suspect switch and the P20 connector.
Repair: Repair the wires or replace the wires.
Verify that the repair has eliminated the problem.
STOP.
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