الخميس، 23 مايو، 2013

BASIC ELECTRICAL COMPONENTS IN TRACTORS ANDAgricultural equipment

BASIC ELECTRICAL COMPONENTS IN TRACTORS   
ANDAgricultural equipment  part1 
BATTERIES
مكونات الكهرباء الأساسية - أساسيات الكهرباء فى الجرار والمعدات الزراعية  جزء أول البطارية

1. Lead connecting strip
2. Splash guard
3. Plastic separator insulates each plate
4. Grid to hold lead paste
5. Active material (positive plate)
6. Active material (negative plate)
7. Sediment trap
BATTERIES
A battery is a device that stores chemical energy and converts the chemical energy into electricity. The amount of the electrical energy that a battery can supply, i.e. its capacity, depends mainly on its size, and is measured in Amps per hour (A/h).
The rate at which a battery converts chemical energy into electrical energy varies according to temperature: the colder the battery, the lower the rate.
Two different kinds of batteries are fitted, depending on the series:
.Lead-Antinomies
.Lead-Calcium
The Lead-Calcium batteries have better characteristics in terms of low electrolyte usage and less topping up of water required: they're also referred to as low maintenance batteries.
It is important not to forget that some machines are seasonal machines, and that there is always a key-off power drained by the radio memory and either the transmission or the EDC module.
Any battery that has been allowed to become completely discharged is hard to recover, but the situation is much worse for Lead-Calcium batteries. If a Lead-Calcium battery is flat, it is hard to recover it with the vehicle charging system or with a standard battery charger: a different type of charging cycle must be used, due to the chemical characteristics of the battery. A computer-controlled charger must be used for this purpose, whose cost is at present extremely high.
Every battery has a CCA (cold cranking amperage) capacity, which is the amount of current the battery can provide to the starter motor at -30¡C. The CCA rating has to be specified by every supplier.
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