Troubleshooting Basics
4-5
965X Service Manual
Analyze the Sub Systems
1.
Check the
Load
for mechanical issues
• Is the Load “bound up?
• Is there sufficient lubrication?
• Is it an alignment issue?
• Is anything damaged?
2.
Check the
Position Feed Back
.
• Does the
Position Feed Back
agree with the
Load
position?
In other words are the correct photo eyes, limit switches or ferrous sensors activated? Check the con
-
troller inputs to insure the proper sensors are activated. If the controller is a PLC, an activated input is
lit. Some touch screens have inputs status also.
3.
Common Position Feedback failures:
•
Photo Eye:
Bad element or bad cable
•
Limit Switch:
Stuck, or failure
•
Wiring:
Broken, worn insulation
•
PLC:
Bad input port.
4.
Check
the
Positioning System
• Follow the circuit from the
Controller
output to the
Load
and check for component
failures.
