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Section 8.Theory of Operation
from Raymond 5200 High-Level Orderpicker Lift Truck Maintenance Manual SN 1000 and up - PDF DOWNLOAD
Wire Guidance System
The Guidance Manager card monitors the direction of travel (forward and reverse) by monitoring the travel speed encoder. This encoder is mounted on top of the traction motor and turns with the armature shaft. As the encoder turns, it sends two voltages, SPEEDFB A and SPEEDFB B, to the Guidance Manager card. SPEEDFB A and SPEEDFB B change state from approximately 12 volts to 0 volts and back as the encoder is rotated.
SPEEDFB A changing state before SPEEDFB B indicates one direction of travel. SPEEDFB B changing state before SPEEDFB A indicates the opposite direction of travel.
The Guidance Manager card must monitor both travel directions to keep the lift truck on the guide wire. The steer request for a lift truck traveling tractor-first is opposite to the steer request when the lift truck travels forks-first. The Guidance Manager card reverses the steer request as the travel direction changes.
Model 5200 High-Level Orderpicker
Publication Number: 1043922B,
