Field experience DF4B locomotive full-seat start-up circuit political construction Li Jun, Song Kecheng (Urumqi Railway Bureau Korla Locomotive Depot, Urumqi 841001, Xinjiang) 2:B 1 problem raised and analyzed a locomotive section 48 locomotive air compressor motor Due to the excitation motor, due to the excitation design of the motor, the motor speed rises rapidly, and the air compressor has a certain residual pressure. Therefore, the motor starts with load when the air compressor starts, and the starting current is large, which is easy to cause air pressure. Machine motor is difficult to commutate, insurance burns and other faults. Therefore, the motor control circuit of the air compressor of the type actually adopts a step-by-step start-up method to reduce the voltage, and then delays the time relay 2SJ by 1~3s, and controls the buck start resistance contactor YRC to pull in, and the step-down start The resistors lRy and 2Ry are short-circuited, and the air compressor enters a stable working state. However, the use of locomotives often causes problems such as overheating and aging of the wire insulation near the step-down starting resistor, overheating deformation of the rear electrical component casing, and even fire hazards. See the circuit for details.
~Reconstruction of the air compressor contactor control principle diagram step-down starting resistor and excitation and transformation of the air compressor wiring electrical schematic diagram due to the early DF4BS locomotive in the air pressure electromechanical armature winding in the series of band-shaped step-down starting resistor Realize the step-down step-start function -), male, engineer, undergraduate.
Yes, therefore, every time the locomotive is used, the air compressor starts the resistor (short time) because of the high current, especially the electromagnetic contactor YRC cannot be caused by mechanical parts, virtual contact or time relay 2SJ failure. Normally pulls in, so that the resistor will continue to pass large currents until it turns red and burns.
2 Countermeasure formulation Because the design and application environment of the motor (with load start) cannot be changed, in order to completely eliminate the potential locomotive fire hazard caused by the start mode of the air compressor, it is determined that the original design is stepped by the step-down starting resistor. The start function is changed to voltage regulator control. Through analysis and research, it is determined that the soft start module is added in the original voltage regulator. When the voltage regulator soft start module collects the air compressor start signal, the auxiliary generator voltage is reduced to about 20V, and the air compressor is controlled after 2~3S. The contactor is sucked in, and after 4~5 s, the air compressor is operated normally and then the voltage is raised to the specified value. The specific circuit transformation scheme is as follows: plug 1 and 11 feet are used for auxiliary generator voltage feedback plug-in 2 feet for controlling air compressor contactor suction plug-in 12-pin for air compressor press closing control signal plug-in 5 15 feet for the freewheeling end - plug-in 9, 10, 20 feet for the power supply negative terminal a voltage regulator plug-in each pin diagram soft-start voltage regulator external wiring diagram from the voltage regulator each pin wiring definition can be seen, in addition to 2 (Continued on page 47) 45 Yang Yuanzhong, Zhang Hongwei, Ding Yaping ss7C machine wheel for rolling bearing heat cause analysis and improvement measures clearance will be greater, under the effect of the wheel on the larger lateral force, the seal ring (two) shaft There is room for swaying.
The calculation of the gap between the inner hub surface of the non-flank side wheel and the sealing ring (2) is due to the circumferential looseness and axial sway of the sealing cover (2), so that the clearance is within the control range.
The axial positioning of the inner ring of the non-tooth side rolling bearing fails, and the traverse amount is destroyed. As the wheel pair moves, the rolling bearing heat is generated. (Note: The df4D type wheel pair clearly specifies the requirement that the gap value is not more than 0.05mm in the drawing).
3 Improvement measures The seal ring (2) of the SS7C machine wheel pair in the factory overhaul is fully updated, the thickness of the seal ring (2) is increased, and the gap between the seal ring (2) large end face and the end face of the wheel inner hub is clarified. No more than 0.05mm requirement. After the sealing ring (2) is assembled, the wheel pair that has not been pressed with the non-tooth side wheel is turned on the horizontal machine tool (CW61140) for the thickness dimension reserved for the large end face of the sealing ring (2) to ensure the non-tooth side wheel press-fit After the end and the sealing ring (two) between the large end face 4 through the adoption of the above process improvement measures, the SS7C type of machine wheel is in good condition, no rolling bearing heating failure. At the same time, combined with the practice of the SS7CS wheel assembly process, the following suggestions are made: (1) Drawing on the requirements of the df4D type wheel pair, the magnitude of the gap between the inner side hub surface of the non-tooth side wheel and the sealing ring (2) is clarified. Standard, it is recommended that the gap value is not more than 0.05mm. (2) On the basis of fully ensuring that the axle powder gathering treatment scheme is implemented and eliminating the transition arc crack between the old axle wheel seat and the bearing housing, it is recommended to increase the sealing ring appropriately (2) The amount of interference.
(Edit: Tang Yuan) (Continued from page 45) 12 feet, the remaining pin wiring is the same as the current voltage regulator wiring definition, that is, the function of the ordinary voltage regulator. The soft start voltage regulator can be used on other DF4BS locomotives.
(2) Reconstruction of the relevant circuit of the air compressor controller.
The 2SJ and buck start resistor contactor YRC are removed from the control circuit (see ). See the step-down starting resistors lRy, 2Ry in the air compressor start circuit.
Foot, capture the air compressor start 6 FLC power regulator 2 feet, with D-control YGI and the modified air compressor contactor control principle diagram air pump motor contact transformation after the air compressor wiring electrical schematic can be seen In the normal working condition of locomotive auxiliary power generation, the air compressor contactor YC is controlled by the power supply adjuster; when the locomotive uses fixed power generation, the auxiliary excitation contactor is disconnected, the normally closed chain is closed, and the YC contactor is controlled. Same as the original control.
(3) For the locomotive equipped with the ZY2000 type adjuster, change to the soft start program by replacing the control board program chip. At the foot of the PE plug 56, the air compressor start signal is introduced, and the YC negative terminal control is taken at the PE plug 54 pin, see.
Machine start signal YC coil head for YC negative end drive modification air compressor contactor control schematic diagram (ZY2000 type excitation regulator) 3 implementation effect Since 2007, 70 sets of locomotives using parallel forced air compressor motor The soft start transformation has eliminated the faults and fire hazards of the original design of the locomotive, reduced the daily inspection, maintenance workload and maintenance cost, and played a positive role in improving the reliability of the locomotive.
(Editor: Shi Cuiyan)
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