System Operation - PAT DS 50 Troubleshooting Manual

DS50 TROUBLE SHOOTING MANUAL
1. INTRODUCTION TO TROUBLESHOOTING THE PAT DS 50

1.2 SYSTEM OPERATION

The Microprocessor Central Unit operates as the control center of the system.
The length cable is connected to the boom nose. During telescoping the length
cable spools off a drum which turns the length potentiometer using a gear
assembly. The length potentiometer is a variable resistor which varies linearly
with the boom length. An angle sensor is built into the central unit which senses
the boom angle. The load cell provides the signal to calculate the load on hook.
The proximity switch located on the hoist drum switches to a different calibration
factor during spooling off the hoist rope. This will allow a steady load calculation
and compensates for the difference in the lever arm. All together the signals get
processed in the central Microprocessor unit where actual and rated load are
compared. The system de-energizes a relay and disables the appropriate crane
functions when the actual load exceeds the rated load by more than 10%.
TSM DS 50-003/REV.B/031-300-190-003/12-02-96
8
LEVEL 3