All mentioned generators have the highest number of constant revolutions 16000 1/min., maximum revolutions 18000 1/min. no more than 15 minutes are allowed. The 70 A generator starts charging at 1150 rpm, the 90 A and 120 A generators at 1200 rpm.
The generators are driven by a multi-ribbed belt from the crankshaft. The pulley mounting bolt is tightened with a torque of 65±5 Nm. Belt tension is automatic, using a spring-loaded roller. Alternators of all types are mounted at four points and are placed on a separate bracket mounted on the crankcase of the engine. The bracket can carry other accessories (for example, power steering oil pump or air conditioning pump, etc.). Amateur intervention in the charging unit is not allowed. For periodic control, maintenance, minor repairs, you must contact the Skoda service.
When using the charger, certain principles and guidelines must be followed.
Cars are equipped with alternators, the use of which became possible only as a result of the development of semiconductor technology and, on its basis, the manufacture of diode semiconductor rectifiers. The alternator is able to provide high power in a significant range of revolutions and recharge the battery already at a speed close to idling. A necessary component of the charging unit is a voltage regulator. A current regulator is not needed, since the generator itself limits its current when the set speed is exceeded. The voltage fluctuates depending on the speed and this determines the use of a voltage regulator. Diodes allow current to flow in only one direction and thereby protect the battery from discharging through the alternator to the case. However, diodes also have their own limits of application, set by their physical nature, and they can only be loaded within certain limits of temperatures and voltages, which must not be exceeded if we do not want to destroy them. In order to make full use of all the positive aspects of the generator and its high durability with minimal maintenance, it is necessary to adhere to the following recommendations: The negative pole of the battery must always be on the case. This should be especially observed when using an auxiliary battery (e.g. when starting the engine in winter). When the poles are reversed, semiconductors are destroyed. The generator will not "get excited".
When charging, the battery is disconnected from the vehicle wiring. Charging the battery is best done using an external source outside the vehicle.
When repairing any part of the power circuit, the battery must be disconnected. Even a short circuit can damage the diodes.
The alternator must not run without load, that is, with the wire disconnected from terminal B. If the connection is bad and the speed is increased, the diodes will again be compromised due to excessively high voltage.
During engine operation, the generator must be fed, therefore, operation without a battery must not be allowed.
If the charge indicator lamp burns out, you must immediately replace it with a new one, because. otherwise, the excitation of the generator necessary for operation does not occur.
When conducting arc welding on a car, the generator must be disconnected in the same way as other components (instrument panel, control unit, etc.). Therefore, all welding work must be carried out exclusively in the Skoda service.
Any repair (And "verification" generator) should be carried out in the Skoda service.
A malfunction in the charging unit is primarily signaled by the charge indicator light, namely:
- when turning the key in the ignition, the light does not light up;
- the charging control lamp does not go out even with an increase in engine speed;
- When the RPM is increased, the light does not go out, but only the intensity of its glow decreases.
If any of the listed malfunctions is detected, despite the fact that other energy consumers are working normally, it is necessary to visit the Skoda service.