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iFLEX5 Boom Control System (BCS)

14.1.3.A Manual Mode Operation:

Primarily used for boom maintenance and function the boom in an unlikely event of a BCS

failure. In manual mode the boom is controlled by the section selector switch in the right

hand arm rest in the cab. When IM selected, crane electric provides full power to the extend

and retract proportional solenoids on the IM pilot operated 4-way directional control valve.

This means the telescoping action is controlled directly by moving the joystick or foot

operated treadle valve. The BCS does not control movement. Likewise when CM is selected,

crane electric provides full power to the extend and retract proportional solenoids on the CM

pilot operated 4-way directional control valve.

Note: In the event of an LMI error, overload, or A2B condition the proportional valves will be

not be energized unless the LMI bypass is activated, either from the central unit or console.

14.1.3.B Auto Mode Operation:

An extend or retract action is initiated by moving the joystick or foot operated treadle valve

causing hydraulic pilot pressure to activate an extend or retract pressure switch. The

pressure switch signals are seen as digital inputs to the BCS. As an example of extend from

fully retracted, the BCS realizes DI 19=1 (extend pressure switch on) and simultaneously

activates DO

9 (IM extend) and DO 3 (PWM 2, IM proportional solenoid). DO 9 energizes a

relay in the BCS relay junction box assy to direct DO 3 to the IM pilot operated 4-way

directional control extend proportional solenoid. Figure 1 illustrates how DO 3 is directed to

the solenoid valve. DO 3 is a PWM output and ramps the output according to variables in the

data software. Ramp-up output is time based. When the IM section approaches a change

over point (change in sequence), DO 3 is ramped down according to variables in the data

software. Ramp-down output is percentage based. See table 1 and table 2 for sequencing

information. At the specified change over point, the BCS turns off DO 9 (IM extend) and

simultaneously turns on DO 6 (CM extend) and DO 1 (PWM 1, CM proportional solenoid).

DO 6 energizes a relay in the BCS relay junction box assy to direct DO 1 to the CM pilot

operated 4-way directional control extend proportional solenoid. DO 1 is a PWM output and

ramps the output according to variables in the data software. When the CM section

approaches a change over point DO 1 ouput is ramped down according to variables in the

data software. And so on. When retracting, the BCS realizes DO 18=1 (retract pressure

switch) and does not activate DO 6 or DO 9. DO 1 or DO 3 are activated based on the

current boom position.

figure 1

Refer to table 2 for digital output definitions

Hirschmann PAT IFLEX5 User Manual

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