Loadmoment Limiter for Lattice Boom Cranes LBC-1
• Truckmounted Lattice Boom Cranes
• Crawler Cranes
LBC-1 is the most economic State-of-the-Art system to realize a loadmoment limiter for lattice boom cranes.
The LBC-1 system consists of sensors for forces and the boomangle and a control (PLC). The multi-colour graphical display shows the important LMI parameters such as the actual load, boomangle and radius. The loadmoment is shown as a digital number in percent but also with an analogue bargraph in trafficlight colours. On the left side, the green field shows, that everything is in right order. At 90% loadmoment, it turns to yellow as a prewarning. At 100% loadmoment, the red fiel will be lit as an indication that LBC-1 now
stopps the dangerous movements of the boom to avoid any further increase of loadmoment.
Both, controller and display are programmed in World-Standard IEC 61131-3 language CoDeSys ®.
LBC-1 fulfils its safety function by activating or shutting down crane functions via digital outputs. For instance, when the loadmoment is 100%, booming down or lifting the load is blocked whereas lowering the load and booming up is enabled.
LBC-1 can be linked directly to the crane controls and other systems by CANBUS or by optional analogue outputs with 4…20 mA output current.
LBC-1 comes as a plug-and-play solution and can be calibrated without any special tools simply on the screen in a very short time.
· Analogue display of loadmoment
· Digital display of load, angle, radius, loadmoment
and optional windspeed
· Tare function
· Alarm function on screen
· Selection of operation mode
· Passcode protected Menu for
o Calibration of sensors
o Finetuning of analogue outputs (optional)
o User defined Cutout limits setting
· 8 digital outputs for critical crane conditions
o Overload cutout
o Overload prewarning
o Underload slackrope
o Single line overload
· 4 analogue inputs (4…20 mA) for sensors; Choice of
sensors acc. to Cranetype
· 6 digital inputs for general purpose or incremental
· 4 PWM outputs (part of the 8 digital outputs)
· Converters available to perform analogue outputs
4…20 mA out of the PWM signals
· 2 CANBUS interfaces