Manitowoc Published 05-03-17, Control # 228-03 1-35
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
too high. The Node-1 controller monitors the motor
displacement and controls the motor speed by regulating the
hydraulic fluid flow through the pumps.
When the drum control handle is moved to the neutral
position, The Node-1 controller compensates for the
hydraulic system leakage or changing engine speed. The
Node-3 controller sends a zero output voltage to each pump
EDC that moves the swashplate to the center position. This
shifts the motors back to the maximum displacement for
slower output speed to slow the drum rotation.
When the control handle is moved to the neutral position, the
Node-1 controller stores the load holding pressure in the
pressure memory. After the control handle center switch
opens, the Node-4 controller sends a zero output to disable
brake release solenoid HS-15. The drum brake valve shifts
to block the pilot pressure to the brake and opens a line to
the tank. When the brake applies, an input signal is sent to
the Node-1 controller. The Node-3 controller sends a zero
volt output to each drum pump EDC to de-stroke the pumps.
The Node-6 controller sends a zero volt output to each motor
PCP.
The drum 2 to drum 1 diverting solenoid HS-21 remains
enabled until drum 2 handle is moved.
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