I often meet many excavators, who are drooping their heads and shaking their heads, saying that the computer boards of the excavators are burned again, and the meters will not shine again. In fact, most of this problem, most of them are man-made failures, usually excavator computer board and instruments are thousands of yuan to more than 10000 yuan, burned out of the heart pain, so usually in the use of excavators, pay attention to the following aspects, can reduce the probability of burning the excavator electrical parts and cause loss.
First, battery line pile head contact bad, contact surface oxidation, the computer board CPU and instrument damage probability greatly improved, the same as the household electrical principle, if the safe contact or switch contact is not good, the light bulb is always bright and dark change will easily burn off the bulb. Electrical systems on excavators are the same as household appliances, so you must always pay attention to whether the contact between the battery pile head is reliable.
Two, the battery line line to reverse, this is a very serious error, the destruction rate is great, the light is the melting wire, the weight is burned out the power circuit of the computer board instrument and CPU, and some of the line on the excavator line have diodes, the power and negative pole will be burned, and the insurance wire must not be spared.
Three, the throttle motor failure or abnormal operation, the valve motor used by the excavator has DC motor and stepper motor. If the motor overheating short circuit is extremely easy to burn out the control circuit part of the computer board, it is inevitable failure. At ordinary times, pay more attention to keep the valve motor of the excavator clean and clean, failure probability It will reduce; when the power supply is open, the valve motor connecting rod of the excavator can not be pulled. If you want to move the throttle control lever, it is very likely to burn the computer board of the excavator.
Four. When it is difficult to start the excavator in cold weather, add the battery 36 volt power to start the machine. This operation is often used on the old excavator. If the machine is operated on a new machine with computer board control, it is possible to get a problem. It is easy to burn the power relay and the safety relay. When the two relays burn out, the internal coils are short. As for the road, the computer boards and meters on the excavator will also burn up.
Five, excavator computer board or instrument water, this phenomenon is very common, destructive is also great, especially when the computer board is charged with water inside, basically burning all the internal circuit board copper foil and oxidizing can not repair, there is a situation is computer board plug inflow, the failure is the computer board needle oxidation, The phenomenon is that the contact between the pin and the circuit board is not good.
Six, the repair master misoperation, many excavator maintenance master because do not understand the circuit, when suspected of an electronic part work is not normal, will think of short circuit test line is normal, this circuit short circuit operation is the most not recommended in the circuit maintenance, very harmful.
The above is the possibility that the excavator computer board instrument is easy to burn out, the use and maintenance of the machine is carried out according to the rules and regulations, and the important device computer board of the excavator is not not so easy to damage.
