Factors affecting the reliability of the controller:
A. The controller failure, from the form of expression, are the following:
1 damaged, the power device;
2, the internal power supply controller damage;
3, the controller works intermittently;
4, connection line and connector is bad or wear off control signal loss caused by.
Two. In view of the above form of failure cause analysis are as follows:
Damage to the A, power device, generally have the following possibilities: motor damage caused by power device itself; the poor quality or use level is not enough cause; device installation or vibration caused by loose; motor overload; the power device driving circuit is damaged or parameters caused by the unreasonable design of the.
Damage to the B, the controller internal power, generally have the following possibilities: controller internal short circuit; the peripheral control unit fault; external lead short circuit.
C, controller work intermittence, generally have the following possibilities: the device itself in high or low temperature environment parameter drift; the overall design of power controller of high temperature in local some devices so high that the device itself into the protection state of bad contact.
D, connecting wire wear and contact plug bad contact or falling off, generally have the following: wire selection unreasonable; protection of the wire is not complete; connector selection is not good; the wiring harness and connectors crimping not.
Fault and maintenance of▲controller
By measuring the controller connected components or lead supply voltage or voltage signal, can analyze and judge the fault location controller. The following is and troubleshooting common controller checks.
A, no brush controller output
Check the high and low potential, and the output signal. If apply the hand brake to brake signal, with potential changes more than 4V, can eliminate brake fault. Then, in accordance with the brush controller chip pin function table, voltage and the main control measure of chip and the logic chip value circuit analysis, and check the chip peripheral devices ( resistor, capacitor, diode ) numerical and whether the element surface sensible, check out the peripheral devices or failure of integrated circuit. We can use the device replacement of the same model to troubleshooting.
Two, the brushless controller has no output
Fault brushless controller power and brake can refer to a fault brush controller excluded excluded.
Three, speed
The failure is usually composed of MOS tube breakdown caused by, if MOS tube damage, may through the device replacement of the same model to troubleshooting.
Four, brush the abnormal power supply controller component
Controller inside power generally use three terminal voltage integrated appliances, generally with the integrated voltage-stabilizing circuit 7805, 7806, 7812, 7815 specifications, the output voltage of 5V, they are 6V, 12V, 15V, general brush controller can be replaced by three end stabilizer troubleshooting integrated circuit.
Five, the brushless controller no output
Reference brushless controller main phase check survey, detection voltage is whether there is a corresponding relationship with the angle of rotation. If there is no corresponding relations, said controller in PWM circuit or MOS tube driving circuit failure. According to the main phase brushless controller test chart, input and output pins measurement chip and the corresponding relationship between the angle of rotation turn, can determine what chip failure. Replace the same chip to troubleshooting.
The following table is commonly used in brushless controller chip pin function.
Methods six replacement, circuit elements and the matters needing attention
In the integrated circuit, to detect the MOS tube is damaged, it is necessary to replace the integrated circuit, MOS pipe, here are some common methods of operation.
1, remove the integrated circuit
When disassembled, alcohol lamp flame flame heating printed circuit board welding circuit pin pads, fast moving uniformly printed circuit board, until all the pad and the solder melts, use tweezers will integrated circuit is removed from the printed circuit board. When welding, solder welding holes clean, integrated circuit plug-in installed, electric soldering iron good grounding rapid welding pin. Pay attention to the speed to be quick, so as to avoid the welding time is long, cause local temperature is too high, damage to circuit or pad.
2, remove the power device
When disassembled, the tube feet cut MOS pipe or three terminal voltage, pin them and then welding, this can avoid removing large feet elements damage pads of the printed circuit board.
3, welding integrated circuits, power devices
The trick is to one-time welding welding. Because the electric iron is a certain heat, if the electric iron long time stay in the welding position, it may make the electric iron heat transfer to the non welded components, damage the high precision parts. This is the electric components are welded, particularly noteworthy, in order to avoid the damage of the circuit components inside the. Welding integrated circuits, power devices, first of all to remove excess solder, the solder clean, let the pad hole clearly visible. Then with less than or equal to the electric iron 30W integrated circuit and a power device in the corresponding position of solder.
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