Several reasons for the computer board burned due to improper maintenance of the excavator!

Release time：2022-05-04    Click：229

I often see many excavator owners sag their heads and shake their heads, saying that the computer board of the excavator is burning again, and the meter will not turn on. When encountering this kind of problem, most of them are human faults. Usually, the computer board and instrument of the excavator are in the range of several thousand yuan to more than ten thousand yuan. It will inevitably cause heartache when burned out, so usually in the use of the excavator, pay attention to the following In this way, it can reduce the probability of burning out the electromechanical devices and cause losses. 

1. Poor contact of the battery wire pile head and oxidation of the contact surface will greatly increase the probability of damage to the computer board CPU and instrument. The principle is the same as that of household appliances. If the fuse box is not in good contact or the switch is not in good contact, the light bulb is always on. Dark changes can easily burn the bulb. The electrical system on the excavator is the same as the household electrical appliances, so always pay attention to whether the contact of the battery pile head is reliable.  
2. The battery wires are connected reversely. This is a very serious mistake. The damage rate is extremely large. The wires will be burnt in the light, and the power circuit and CPU of the computer board will be burned out. If the negative pole is reversed, basically these diodes will also be burnt out, and the fuse will certainly not be spared.  
3. Throttle motor failure or abnormal operation. Throttle motors used in excavators include DC motors and stepper motors. If the motor is overheated or short-circuited, it is extremely easy to burn the throttle control circuit of the computer board. This is an inevitable failure. Pay more attention to it. Keep the excavator throttle motor assembly clean and clean, and the probability of failure will be reduced. When the excavator is powered on, the throttle motor linkage of the excavator cannot be pulled. If you want to move the throttle control lever hard, It is very likely to burn the computer board of the excavator.  
4. When the cold weather digging machine is difficult to start, add a 36-volt power supply start the machine. This operation method is often used on old digging machines. If it is operated on a newer model with a computer board control machine, there may be problems. It is easy to burn the main power relay and safety relay. When these two relays burn out and cause the internal coil to short-circuit, the computer board and instrument on the excavator will also burn out.
Fifth, the computer board or instrument of the digging machine enters the water.This phenomenon is very common and extremely destructive. Especially when the internal water enters when the computer board is charged, it will burn all the copper foil of the internal circuit board and be oxidized. There is a case where the computer board plug harness enters the water, and the failure will be caused by the oxidation of the pin of the computer board. The phenomenon is that the contact between the pin and the soldering point of the circuit board is poor.
Sixth, the maintenance master mishandled, because many excavator maintenance masters do not understand the circuit, when they suspect that an electronic part is not working properly, they will think of using the short circuit method to test whether the circuit is normal.
This method of circuit short circuit operation is the most Not recommended, it is very harmful. The above are several possibilities that cause the computer board of the excavator to burn out easily. Usually, the use and maintenance of the machine are carried out according to the regulations. The computer board of the important components of the excavator is not so easy to damage.