Model 5200 High-Level Orderpicker

Travel General

When the potentiometer voltage increases or decreases from the neutral deadband, the Steer/Tractor Manager sends a travel request for direction (TF/FORWARD or FF/REVERSE) and speed (TRAVEL REQ) to the traction power amplifier. The voltage from the Steer/Tractor Manager is directly related to the speed request. As the input request changes, the travel request voltage to the traction power amplifier mirrors the change. See “Modes of Operation” on page5-24.

When a change in direction is requested, the Steer/Tractor Manager changes the direction request to the traction power amplifier and changes the speed request output (TRAVEL REQ) to reflect the requested plugging strength.

Moving Directional/Speed Control

NOTE: The current flowing through the traction motor armature and field windings are controlled independently of each other by the traction power amplifier.

1.When the throttle is moved to the forward position (tractor-first), the wiper in the variable resistor (VR-1) is moved so that the voltage output decreases. The Carriage Manager, sensing this decrease in voltage, sends a communication message over the transmit line to the Tractor Manager. The Tractor Manager interprets this as a request for travel in the forward direction and causes the following steps to occur: a.The TF/FORWARD line to the traction power amplifier is activated (driven to about 19VDC). This is the input to the traction power amplifier that determines the traction motor field polarity to enable travel in the forward direction. b.The traction power amplifier then drives its internal field control transistors to