User Manual

Bosch Rexroth AG
RE 95310/01.09
LLC Load Limiting Control
9/12
Variant LLCB
Figure 7: How the LLCB load limiting control works
Specified
speed
Safety switch
Teach
Actual speed
Power mode 2/3
Maximum
power
Diesel
characteristic
Calculation
Speed drop
Characteristic
Slew drive
Load limiting
control
Slew drive
shaft in
control block
Working
pump
Important features
• The maximum flow rate of the slew drive motor can be
set using a characteristic irrespective of the diesel engine
speed.
• Power modes: Switches between three different permissible
hydraulic powers. These arise from the permissible speed
drops that are specified differently for each power mode.
• Maximum power mode: A switched input, "Maximum Power",
can be used to switch between reduced hydraulic handling
power and maximum working power.
• The definition of the ratio of specified speed to actual speed
can be executed in "Teach Mode" without BODAS service.
• All errors that occur are stored in the controller and can also
be read later in plain text form using BODAS service.
Important parameters
• Diesel engine data (number of teeth on the starter gear rim,
dynamic behavior, permissible speed drop)
• Potentiometer for specified speed
• Minimum and maximum magnetic current for working hydrau-
lic pump and slew drive valve
• Load limiting control (dynamic controller data)