To Next Page

To Previous Page

iFLEX5 Boom Control System (BCS)

14.10 HYDRAULIC LUFFING BOOM EXTENSION:

Hydraulic control of the extension consists of a four-way, three position directional control valve, a

hose reel, a proportional control valve and a double acting cylinder. The four-way, three position

directional control valve is mounted on the turntable. There are two solenoids for directing the flow for

extension or retraction of the cylinder. The hose reel is mounted on the boom and conveys the

hydraulic fluid to the cylinder on the boom extension. The proportional control valve is mounted to the

cylinder on the boom extension.

The offset angle is measured directly by a potentiometer located on the base adapter. The opposite

end of a lever arm mounted on the potentiometer shaft rests on and follows the structure which

offsets. PAT does not supply the potentiometer.

There are two ways to offset the luffing extension. The first is two switches located in the left hand

armrest. One switch is a luffing system ON/OFF switch. The other is a RAISE/LOWER switch. This

switch has momentary positions on either side, and a return to center position. It raises or lowers the

extension by controlling the raise and lower solenoids on the four–way three position directional valve.

This switch also sends an actuation signals to the LMI. DI 8=1 (raise) DI 9=1 (lower). The

proportional solenoid on the luffing cylinder is energized by DO 5 & 7 (PWM 3 & 4) if DI 8=1. The

proportional valve on the luffing cylinder is not be energized for luffer lower. Hydraulically the

proportional valve is bypassed for luffer lower.

Raise and lower can also be activated form remote switches located on the extension. Remote raise

is DI 10 and remote lower is DI 11. The raise and lower solenoids on the turntable are energized by

DO 9 & 11 respectively. If DI 10=1, then DO 5, 7, & 9=1. If DI 11=1, then DO 11=1. The proportional

valve on the luffing cylinder is not be energized for luffer lower. Hydraulically the proportional valve is

bypassed for luffer lower. See sketch below.

Hirschmann PAT IFLEX5 User Manual

Questions and Answers: