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W301-0411E
Chapter B Chapter B
User Mode
B-8 Proportional Control Function
This section describes the deceleration and slow stop controls by the hydraulic pilot pressure restriction using
the solenoid proportional valve.
8.1 Factors for Control
Factors for deceleration and slow stop include the conditions below. The slow stop function can be canceled by
the switch input or software setting.
- Elevation slow stop
Load moment ratio 100% stop: Elevation lowering
(Load ratio 100% stop)
Backward stability stop: Elevation raising
Working Range limit stop: Elevation raising, elevation lowering
Elevating cylinder stroke end stop: Elevation raising, elevation lowering
Re-stop: Elevation lowering
Boom interference stop: Elevation lowering
- Swing slow stop
Working Range limit stop: Right swing, left swing
Capacity change at O/R beam differential extension: Right swing, left swing
Swing free control: Common with left and right swing
- Speed limit
Elevation speed limit: Elevation raising, elevation lowering
Swing speed limit: Right swing, left swing
- Other
Deceleration processing’s (specific to particular models, etc.)
When there is duplication of two or more control factors, the one with the largest output value is output.
8.2 Elevation Slow Stop
The elevation slow stop functions with the stop positions by load moment ratio (load ratio) 100% stop,
backward stability stop, working range limit stop, elevating cylinder stroke end stop, and boom
interference stop adopted as the target stop angle. However, when multiple conditions are met, the control
is implemented for the one having the smallest allowable angle in relation to the stop angle.
8.3 Swing Slow Stop
The swing slow stop functions while adopting the stop positions by working range limit stop, shift to lower
capacity at outrigger (O/R) slide beam differential extension, and boom interference stop as the target
stop angle. However, when multiple conditions are met, the control is implemented for the one having the
smallest allowable angle between the target stop angle and current swing angle.
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