1. Common Faults 1. Contact Burning This is the most common fault of the regulator. Generally, the contacts of the shutoff device are easily burned and the contacts of the voltage regulator are easily oxidized. (1) The blower contacts are burned, mostly due to improper adjustment of the regulator. For example, when the voltage regulator and the current limiter are improperly adjusted, the voltage limit value is too high, and the current limit value is too large, which will cause excessive charging current and will burn the contacts of the interceptor. When the interceptor is improperly adjusted, such as a high closing voltage, a large potential difference between the contacts, and a strong spark when closed, the contacts are easily burned. When the closing voltage is too low, making the generator voltage lower than the battery voltage, the contact is closed, so that the battery current back to the generator, so that the contacts open again, resulting in frequent opening and closing of the closure contacts, accelerating contact burning damage. When the generator is not working, the closure contacts cannot be opened, causing excessive reverse current and burning the contacts. (2) Burnout of the voltage con- troller contacts. In normal operation, the contacts constantly open and close as the voltage changes, and thus the contacts are easily contaminated and oxidized. When the adjustment is improper, if the voltage limiting of the voltage regulator is adjusted too low, the contact opening and closing times will increase; the current limiting value of the current limiter is too large, so that it will not work under normal circumstances and will increase the voltage regulator. The burden of work. When the contacts of the voltage regulator and the current limiter are dirty and burned, the generator cannot obtain enough exciting current, which will cause the generator to generate weak electricity, even without generating electricity. When the contact of the interceptor is burned, the contacts are in poor contact and the generator cannot charge the battery normally. When the contacts are sintered together, the battery's power will flow back to the generator, causing the generator and regulator to burn. 2. Resistor Burnout The FTB1D type regulator has 4 resistors such as 80Ω, 30Ω, 13Ω, 1Ω, etc., in which 1Ω resistor is often burned. When the 1Ω resistor is burned out, it is in series with the magnetic field circuit, so that the magnetic field circuit is disconnected, causing a generator Do not generate electricity. The reason that the 1Ω resistor is burned out is that the voltage of the voltage regulator is too high and the magnetic field current is too large, causing the 1Ω resistor to overheat and burn. In addition, when the regulator is not equipped with a wire, or the ground is not good, or the coil of the voltage regulator is disconnected, the generator generates electricity as usual, but the voltage regulator and the interceptor do not work, causing the voltage to rise, causing the 1Ω resistor to burn out. Sometimes due to wiring error of the generator and regulator, such as "armature" and "magnetic field" line head reversed, or "battery" and "magnetic field" line head reversed, will make 1Ω resistance through a large current, causing it to burn. 3. The coils in the coil burn-out condenser and the choke are often burned due to the high voltage limit of the voltage regulator. The series coil on the current limiter and the interceptor is not easy to break because of its thick diameter, but when the interceptor is improperly adjusted or the contact of the interceptor cannot be opened, a large reverse current will be generated, the coil will be overheated, and the insulation will be burned and short-circuited. When the shunt coil is short-circuited or open circuited, the regulation voltage will increase, and when it is open circuit, the voltage regulator will stop working. Short circuit or open circuit of the shunt parallel coil will make the closure contact unable to close and unable to charge the battery. When the series coil is disconnected, it will increase the current limit value or the overcurrent of the interceptor. Second, the regulator repair 1. Contact repair regulator Three pairs of contacts, the voltage regulator is mostly tungsten contacts, current limiter and closure are mostly silver and copper contacts. Tungsten contacts are mostly welded and silver and copper contacts are riveted. When the contact is not severely burned, if the thickness is above 0.6mm, it can be repaired with white sand bar or rubbed with oilstone; when the burning is serious, if the pit or thickness is less than 0.4mm, the contact should be replaced. When replacing the current limiter or the closure contact, first use the thin flat boring to remove the riveted back of the old contact, and then use the φ2 mm boring head to pull out the old contact, then use the special contact riveting tool to replace the new contact. The contacts are riveted. If there is no special pressure riveting tool, the contacts can be placed on cardboard or hardwood boards and carefully riveted with a small hammer. When replacing the voltage con- troller contacts, contact welding may be performed by gas welding or using a battery as a power source. The latter first clamps the old contacts between the welding device electrodes, turns on the power supply, heats the contacts to melt the solder, and then removes the old contacts, then trims and cleans the contact welding surfaces with a trowel, and places the thin copper plate. (Solder) and the new contact are sandwiched between the welding electrodes, the power supply is turned on, and the borax is sprinkled on the contact point, and welding is performed after 3 to 5 seconds. After welding, the contacts are cleaned in dilute hydrochloric acid and smoothed. After repair, the surface of the pair of contacts shall be clean and smooth, the two contacts shall be closely attached, the joint area shall be 70% or more, the center offset of the two contacts shall not be greater than 0.15-0.20mm, and the contact height shall not be less than 0.6-0.7. Mm. 2. Repair of the resistor The 1Ω resistor is the most easily burned, and it is generally made into a separate component, which can be replaced with a new one immediately after it is burned. However, some 1 Ω resistors of the regulator are wound on the iron core of the current limiter. When they are replaced, they can be installed between the regulators and the two fixing nuts of the restrictor core. In the absence of fittings, a constantan wire with a diameter of 0.2 mm and a length of 65 mm can be used instead on the mica sheet. After the 13Ω, 30Ω, and 80Ω resistors are damaged, they can be replaced directly. 3. Repair of the coil If the coil of the parallel connection of the regulator is only mechanically damaged and open circuited several times, it can be removed and used repeatedly without rewinding. If the coil insulation is damaged, the internal short circuit or open circuit must be re-wound. . When replacing the coil, the core must be pressed out of the frame, and then the core should be wrapped with a thin insulating paper. Then, according to the specified conductor number, wire diameter, number of turns, winding direction and joint position, system. When winding the series coil on a parallel coil, use a thick insulating paper to protect the parallel coil. The parallel coil of the interceptor is made of two pieces of wire with different materials, one part is an enameled wire wound on the outer layer, and the other part is a constantan wire wound in the inner ring (white, hard, like fine steel wire, large resistance , but small with changes in temperature). If you can't buy the copper wire that meets the specifications, you can burn the red wire several times in the old line, like an oxide film on the surface, and continue to use it. After the series coil insulation of the current limiter and the interceptor is burned out, the series coil on the old regulator is generally used for repair. Author: Heilongjiang Province Jidong Agricultural Machinery Station Xingfu Township Government, Beilin District, Suihua City, Heilongjiang Province
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