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ELECTRONIC LOAD CONTROL METER

ELECTRONIC LOAD CONTROL METER. Installation and Programming. Introduction. Miguel Vega Plastecnic embarks upon the design and development of load meters in 1996.

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ELECTRONIC LOAD CONTROL METER

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  1. ELECTRONIC LOAD CONTROL METER Installation and Programming

  2. Introduction • Miguel Vega Plastecnic embarks upon the design and development of load meters in 1996. • Subsequent to ongoing development, MV Plastecnic presents the market with a weighing device, which based on the increase in pressure in a vehicle’s pneumatic suspension is able to determine the weight of the load with complete accuracy. • In other words, the vehicle becomes a weighing machine on wheels.

  3. Types of vehicle • The load meter can be installed in: • Articulated vehicles with pneumatic suspension at least on the drive shaft in the tractor unit, and pneumatic suspension in the semitrailer. • Rigid vehicles with integral pneumatic suspension.

  4. Which meter should we install? Height sensor (electronic levelling) Levelling valve (pneumatic levelling) • The pneumatic suspension on vehicles consists of a series of sensors that measure the height of the vehicle to maintain it constant despite the increase in load. • The first step for the correct installationof the load meter is to determine the number of height sensors or levelling valves the lorry has in its pneumatic installation.

  5. Where are the height sensors? • The number of height sensors on the vehicle determines which load meter is to be installed. For a vehicle with: • 2 height sensors ► 2-Way load meter. • 3 height sensors ► 3-Way load meter. • 4 height sensors ► 4-Way load meter (exceptional case) Where to look: Articulated vehicles: Tractor unit Drive shaft Trailer Central or rear shaft Where to look: Rigid vehicles: Steering shaft Rear shaft

  6. Example in articulated lorries • 2-Way load meter • 1 sensor for the tractor unit • 1 sensor for the semitrailer 1 Levelling valve 1 Height sensor • 3-Way load meter • 2 sensors for the tractor unit • 1 sensor for the semitrailer 1Levelling valve 2Height sensors (I/D)

  7. Example in rigid lorries • 2-Way load meter • 1 sensor for the forward shaft • 1 sensor for the rear shaft 1Height sensor 1Height sensor • 3-Way load meter • 1 sensor for the forward shaft • 2 sensors for the rear shaft 2Height sensors (I/D) 1Height sensor

  8. Installation kit Electronic display. Sensor box. Cabling for connecting display and sensor box (10m). Display supply cable (1m). Attachment items for the components. Fittings required for the pneumatic installation. Tecalan pipe in two colours to differentiate between pneumatic signals. Installation and programming manual. Installation

  9. 2-Way Installation Diagram. Articulated.

  10. 3-Way Installation Diagram. Articulated.

  11. 2-Way Installation Diagram. Rigid.

  12. 3-Way Installation Diagram. Rigid.

  13. Programming • Once the meter has been installed, the screen should display a weight reading, which indicates that everything has been properly installed. • Programming will require finding a flat weighing machine upon which to carry out a series of weighing procedures. • It is very important that this weighing machine does not have a ramp at the entrance as it will incorrectly read the weights that are to be taken. • A loading process involving the vehicle will be used to adjust the weight in the display. • With an articulated lorry, for example, the following steps are taken:

  14. Vehicle Empty • Weigh the tractor unit, up to the support legs. • Record in the manual • PV2 = _________ Kg • E.g.: 8,500 Kg • Weigh the whole lorry. • Record in the manual • PV1 = __________ Kg • E.g.: 14,500 Kg

  15. Vehicle Empty • Park the vehicle in a flat area, release the brakes and with the lifting shaft down. • Switch on the device: • The device reads the pressure in the tractor units, reads the pressure in the semitrailer and takes that pressure to give a zero reading for the load. • Never carry out this process with a loaded vehicle, as the device will not adopt a zero-setting and the weight carried by the lorry will not be displayed. If a mistake is made, repeat the deadweight reading with the vehicle empty as specified beforehand.

  16. Vehicle Loaded • Weigh the tractor unit, up to the support legs. • Record in the manual • PC2 = _________ Kg • E.g.: 16,800 Kg • Weigh the whole lorry. • Record in the manual • PC1 = _________ Kg • E.g.: 39,500 Kg

  17. Vehicle Loaded • Perform the following operations: • PC1 – PV1. Net weight of the vehicle = T. • E.g.: 39,500 – 14,500 = 25,000 = T • PC2 – PV2. Weight corresponding to the tractor unit = C. • E.g.: 16,800 – 8,500 = 8,300 = C • T – C = S. • E.g.: 25,000 – 8,300 = 16,700 = S • C and S are the values to be inserted for programming the device. With the brakes off on the vehicle, it may now be programmed. Now insert DATA C DATA S

  18. Vehicle Loaded • Adjust the weight of the tractor unit C. E.g.: 8300 Kg

  19. Vehicle Loaded • Adjust the weight of the semitrailerS. E.g.: 16700 Kg

  20. Notes on programming • The programming of the device is retained in the memory even when the power supply is disconnected. Nevertheless, the user may return to the programming once the supply is restored. It is very important for the user to make a note in the manual of the values displayed on the screen. These values are what we refer to as factors and appear on the bottom line when we adjust the weight. • Record FC = 2143andFS = 1456 • In the event of a fault in the display, knowledge of these factors will remove the need for reprogramming the meter, which will make it quicker to set up again. • These factors are different for each vehicle, but very close. If during programming these values were to exceed the value of 3000 this would indicate that there is an error in the installation or programming.

  21. Notes • Programming for rigid vehicles is the same as for articulated lorries, changing the names of tractor unit for forward shaft and semitrailer for rear shaft. • Once the device has been installed and programmed, all that remains is to switch it on and switch it off to read the weight of the load. • To ensure that the device indicates the correct weight, the lorry should have the brakes released and be on a flat surface, although the variations in other circumstances are not especially significant.. • To eliminate variations in the vehicle’s deadweight, the weighing procedure can be carried out at will, with the vehicle empty, brakes released and with the lifting shaft down. • The reliability of our equipment is guaranteed by our quality department, which under Standard ISO. 9001:2000 verifies and certifies the correct operation of all the equipment we produce.

  22. Display: Dimensions: 150x66x66mm. Colour: ABS Black. Screen: 16x2 liquid crystal, back-lit. Supply: 18-30 Vdc. Consumption: 200 mA at 24 Vdc. Accuracy of measurement: Standard ± 0.4%, maximum ± 0.8 % Operating temperature: Standard -40 a +85 ºC Sensor box: Dimensions: 165x90x58mm. Colour: ABS Black. Degree of protection: IP65. Technical specifications

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