Trouble-shooting: The centrifuge is a DC-type speed-regulating motor. The speed of the centrifuge is to change the conduction angle of the thyristor through the adjustable resistor, and then the voltage controlled by the thyristor to reach the two ends of the motor is controlled. The purpose of speed \"motor speed is unstable, from the principle analysis, the following four situations are possible.
(1) Adjustable resistance, because the adjustable resistor is installed on the control panel, the frequency of use is very high, and the time is long, and the situation of poor contact is common.
(2) There are also many problems with thyristors, usually breakdown short circuit, open circuit, unable to trigger or poor internal contact.
(3) One of the four rectifier diodes has only a problem.
(4) There is toner or carbon brush between the rotor and the commutator. The principle is that the first step is easy to repair. The first step is to measure the adjustable resistance. The resistance value changes regularly with the adjustment. Prove the potentiometer. It is good. There is no problem in measuring the thyristor. When measuring four rectifier diodes, one is found to be good or bad. Since the diode is a high current gold sealing tube, one end of the screw is fastened to the circuit board, and the other is When one wire is soldered to the circuit board and removed from the circuit board, it is found that the positive and negative poles are loose, and then the side is shaken while measuring, confirming that the diode is good or bad. Since the tube type cannot be seen clearly, the same The specification of the pipe is installed, the power is turned on and the rotation speed is very fast, and the pipe is considered to be broken, and the measurement is intact.
(5) It is normal to measure the other three diodes. However, when comparing the measurements, it was found that the positive and negative polarities of the two types of diodes are completely opposite (that is, one end of the upper screw has a positive polarity and a negative polarity). When you must pay attention to the use of the same type of components, the same specifications of the components. When replaced with the same specifications of the same type of components, the power test machine, everything returned to normal.
The solar warning traffic sign is a kind of traffic sign. It is composed of a sign surface, a sign bottom plate, a solar panel, a controller, and a light-emitting unit (LED). It uses text and patterns to convey warning, prohibition, and instruction information to drivers and pedestrians. To manage the safety facilities of road traffic.
Solar energy warning signs for road traffic, some intersections, this kind of traffic signs is better than ordinary traffic signs, especially at night, it can be done.
1. fan-shaped Unique road construction yellow flashing led warning light, a model independently developed by our company, with novel style and unique craftsmanship.
2. The fan-shaped Unique road construction yellow flashing led warning light is made of a combination of c52 rubber and plastic tubes. A single pixel tube contains 12 Taiwan Epistar lamp beads. The color is distinct and the brightness is sufficient. The pixel tube is filled with glue for 4 weeks and has good waterproof performance.
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Shenzhen Wide Way Optoelectronics Co., Ltd. , https://www.wdmtrafficlight.com