Zoomlion Hirschmann HC4900 Load Moment Indicator (LMI) provides effective information to operators, which will assist an operator maintain a machine to work within its design parameters. LMI provides the operator with the information of the length and angle of the boom, tip height, working radius, rated load and the actual load weight and so on. Using various sensing devices, the load moment indicator monitors machine’s various operational functions and provides the operator with a continuous reading of the machine’s capacity. The readings change continuously in response to the different operations of the machine. If forbidden conditions are approached, the HC4900 Load Moment Indicator will warn the operator by sounding an audible alarm, lighting a warning light and locking out those functions that may aggravate the machine’s condition. This user manual is used for Zoomlion RT crane with a 4-section boom.
Zoomlion Hirschmann HC4900 LMI System configuration
HC4900 LMI system comprises a HC 4900 central unit with an IC 4600 console together with various sensors to record the measured values. The system operates on the principle of reference/real comparison. The actual value is compared with the calculated reference values and evaluated by the system. An overload warning signal is triggered on the display and operating console once limit values are reached. All machine movements that increase the load moment are switched off at the same time. The crane-specific data specified by the manufacturer, such as load capacity charts, boom weights, centers of gravity and dimensions, are stored in the central data memory. This data is the reference information used to calculate the operating conditions. The boom angle and length is measured by means of length and angle sensors that are mounted on the boom. The crane load is determined indirectly with the aid of pressure transducers.
Zoomlion Hirschmann IC4600 Console
IC 4600 monochrome console is designed for outdoor construction vehicles and mobile machinery. It complies with international standards for environmental testing, EMC testing, and CE certification. Its easy programming, convenient online debugging, and rich paint library functions (point, line, arc, rectangle, progress bar, virtual instrument panel, such as function) help you to more efficiently understand and utilize the LMI system.
DAVS Pressure transducer
DAVS pressure transducers measure high static and dynamic pressure values of liquids or gases in rough operating environment. Measurement precision is maintained even during continuous operation at extremely dynamic pressure. The oil pressure transducer comes with a pressure connector with standardized G1/4 thread or other hydraulic connectors.
- Operating voltage: 8~32VDC
- Signal: CANopen
- Operating temperature:-40°C~+85°C
- Storing temperature: -40°C~+100°C
- Protection class: IP67
- Life expectancy: >10 million cycles
- Hysteresis tolerance: 〈±0.1%FS max.
Please notice the location of hydraulic piping and valve when installing the pressure transducer. By thread connection (such as follow graph), screw the pressure transducer in the hydraulic piping or seat of the balancing valves or hydraulic valves. Add the appropriate seal to the display to prevent oil leakage. Guarantee the installation position is safe and easy for cable connecting. Make sure the pressure sensor and hydraulic adaptor connect tightly. The tightening moment of G1/4 connector is 20Nm.
LWG208 Length/Angle sensor
LWG series Length/Angle sensor can be directly installed and can precisely measure the angle and the length of boom with largest measurement length of fifty meters. The sealed housing protects the inside components from water inclusion, humidity etc.
Length/Angle sensor is installed on the main boom. Manufacturers can fix the bracket of the sensor to the crane boom by welding tap blocks and bolting it in place. When installing the sensor, the position shall be well considered, generally along the foot points of boom to the top direction. The sensor (left type) is typically installed on the left of the boom (aligned with the cab) to leave room for the fly (jib) on the right side of the boom. The sensor can be located on the right side as required. The cover can be turned 180° to put the PAT name facing upward.