Gen4 - General - What is Gen 4 LMS?
Hardware Overview
Display
The Model 6205 Display Module is the main HMI device for the Gen4-LMS. It is used to display information to the
operator. It contains a built in touch screen to allow the operator to interact with the system, and dual audio
speakers. It contains a linux based multimedia processor with advanced 3D graphics capabilities. It also displays the
camera images to the operator. The display is mounted inside the cabin.
The display process is used to generate the LCD display images and speaker sounds used by the operator. It also
controls all the hardware elements of the display module (including the LCD brightness and sound volume). Along with the
main screen and cameras the display process can also show web pages from the onboard web server.
Safety Processing Module (SPM)
The Model 6204 Safety Processing Module (SPM) is the main processing unit for the Gen 4 and is connected to all
other components. It contains two separate processors; a safety processor for all safety related processing and a
linux based processor for advanced HMI functionality (including a Wi-Fi interface). It contains on board sensors to measure
the chassis angle. It also performs all the safety and load measurement calculations. The safety processor contains two independent channels for reliability and connects to the
other external sensors via various methods. It is capable of storing the configuration for the machine and current attachment, therefore, it is able to operate without the LMP on the linux processor. The SMP also runs a number of safety checks on itself and the other sensors to determine any hardware faults and can generate over 100 different fault codes to isolate the hardware fault. The SPM is mounted
under the cabin side cover (under the boom).
BPS
The Model 6207 Boom Position Sensor (BPS) is used to determine the current boom orientation by measuring the
boom angle & extension. It has a dual channel architecture and contains two of each sensor and processor. The
sensor measurements are transmitted to the safety processor in the SPM via CAN bus using the J1939 protocol.
The BPS is mounted on the end of the base boom section.
Stow Switch
The stow switch is used in the boom extension measurement (performed by the BPS) and indicates when the boom
is fully retracted (at 0 extension). It consists of a single proximity switch which is mounted at the rear of the boom - at
the back of the machine. The proximity switch connects to the safety
processor in the Safety Processing Module via two digital inputs.
Pressure Sensors
There are a total of 4 pressure sensors that measure the pressure applied by both the lift and compensation
cylinders. Each pressure sensor contains a dual channel architecture (each with a separate output signal). The output connects to the safety processor in the Safety Processing Module via a total of 8 analogue inputs. The
pressure sensors are installed in the lift and compensation cylinders.
Light Tower
The light tower is used to indicate the current safety state to workers around the machine. It consists of 3 colored
lights; green - normal, yellow - warning, red - alarm and is controlled by the safety processor. The light tower is mounted on the roof of the cabin.
Cameras
The system offers a two analog camera capability (one reversing camera and one forward camera). The reversing camera is used to see what is behind the vehicle whilst reversing and the forward camera is used to see the front right
wheel when the boom is blocking the view from the cabin. The reverse camera is automatically activated when the
machine is in reverse drive and same with the forward camera when the machine is in forward drive. The analogue
camera outputs are connected to a camera switch in the Safety Processing Module.
What the Gen 4 system is not
The Gen 4 LMS system was never designed to be a weight measuring system but rather, it is a weight monitoring system, intended to create safety cutouts when the machine (on which it is mounted), is pushed beyond safety limits.
As outlined above, the Gen 4 LMS system uses boom mounted pressure sensors to monitor shifting hydraulic pressures during the normal use of the telehandler. The sensor data is then used to calculate and provide a good approximation of the weight being lifted by the telehandler.
This system is certainly capable of dynamically providing the operator with an indication of the weight being lifted, but this displayed weight should never be treated as if it has been taken from a set of scales. Based upon the Gen 4 calculated load, as soon as the Gen 4 system senses that the telehandler has been pushed into an unsafe state, it will cutout operation of the hydraulics.
The weight monitoring capability of the Gen 4 system is perfectly suited for it's intended purpose (to provide an additional level of safety by monitoring the weight being lifted and then to create cutouts if the capacity has been exceeded).Related Articles
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