Operator`s manual

The solenoid-operated switches (34) and (35) are controlled by the Bourdon Tube Micro Swtich (25).
When the pressure in the ladder lifting cylinders exceeds 1050 psi, the Bourdon Tube Micro Switch opens,
causing the solenoid-operated switches to open. Current is cut to the A side of the Extension Solenoid
(18) and the A side of the Elevation solenoid (20). The ladder cannot be extended or depressed until the
pressure is reduced in the ladder lifting cylinders or the Emergency Override Button (22) is depressed,
which will cause the solenoid-operated switches to close and allow current flow to the A side of the
Extension Solenoid and the A side of the Elevation Solenoid while the Emergency Override Button is
depressed. When the Bourdon Tube Micro Switch opens, an amber light (26) on the Ladder Control
Console will light.
Ladder Rotation - when the Ladder Rotation Joystick (2) is moved toward C+, current is directed via the
Current Regulator (13) to the C side of the Rotation Solenoid (19), causing the corresponding Proportional
Valve to open and the ladder to rotate in a clockwise direction. When the Ladder Rotation Joystick (2) is
moved toward D-, current is directed via the Current Regulator (13) to the D side of the Rotation Solenoid
(19) causing the corresponding Proportional Valve to open in the opposite direction and the ladder to
rotate counterclockwise.
Ladder Elevation and Depression - when the Ladder Elevation Joystick (3) is moved toward A+, current is
directed via the Current Regulator (14) to the A side of Elevation Solenoid (20), causing the corresponding
Proportional Valve to open and the ladder to depress. When the Ladder Elevation Joystick (3) is moved
toward B-, current is directed via the Current Regulator (14) to the B side of the Elevation Solenoid (20)
causing the corresponding Proportional Valve to open in the opposite direction and the ladder to elevate.
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