Fault finding of pole joint connection of the hott

Fault finding of the pole joint of forklift battery

the pole joint of the battery on the forklift is often bumpy on the road or oxidized and corroded by itself, so users can choose products that are more suitable for themselves. Loose equipment makes the resistance value at the pole become very large. When the starter works, it will produce a great voltage drop, causing the starter to rotate weakly and get hot. This fault has become common sense. However, the slight loosening of the connector during driving operation (you may not feel hot when touching it with your hand due to sudden heat and cooling) will also cause some other electrical faults, which are not known to everyone, because the symptoms of these faults are very similar to other common electrical faults and have a certain degree of concealment. The first of these failures is the sudden failure of the semiconductor flasher, the flash of the bulb, and the damage of the original instrument circuit board; Second, the contact of the circuit breaker of the gasoline engine is easy to ablate, causing poor operation of the engine ignition system and unstable speed. The reasons for these electrical problems are analyzed as follows:

battery is not only an important part of forklift power supply, but also a large load in the electrical system, which is characterized by very small internal resistance, large capacity and basically constant voltage. When the connector is loose (i.e. intermittent contact) or even suddenly disconnected during work, it is equivalent to that a breaker is connected in series in the battery circuit of the generator regulator of the forklift circuit (belonging to the inductive load circuit). At the moment when the pole pile joint of the battery is loose and disconnected or half disconnected, the output current (i.e. charging current) of the generator will change sharply, and the magnetic flux of the armature core of the generator will also change sharply. It is the armature winding that induces a very high voltage (self induced voltage and current) and superimposes it on the electrical system, so that the instantaneous voltage and current of the whole electrical system are far greater than the rated value, This instantaneous peak voltage is often the main cause of sudden electrical failure (or damage) of forklift (similar to the failure of regulator imbalance); For the ignition system, the primary current is too large, which will cause overheating of the primary winding and ablation of the platinum contact of the breaker (this is very similar to the failure of the capacitor or poor iron measures). Moreover, this self inductance phenomenon becomes more and more serious with the increase of generator speed and charging current (when the battery has a lot of power loss). Although the self inductance voltage is very high, it exists for a very short time, which is far less than the reaction time of ammeter and regulator. Therefore, ammeter cannot show it, and generator regulator does not work on it

furthermore, when there are electrical faults such as the angle of the power-off appliance, the resistance value of the friction contact area R ＜ R1, which is easy to be ablated, and the lights often flash off, we should not only check the capacitor and regulator according to the routine, but also pay attention to check whether the pole joint of the battery is loose from time to time, so as to quickly find the root cause of the fault