Fault Diagnosis Method for Control Circuit of ZDJ9 Double-machine Traction Speed-up Turnout Electric Switch Machine
[Objective]In the ZDJ9 double-machine traction speed-up turnout electric switch control circuit,1DQJ is an in-stantaneous suction relay.When the outdoor switch circuit does not form a loop,that is,in the event of a fault,the 1DQJ relay only maintains a short-term suction state for about 1s.When dealing with the fault point,technicians usually use a multime-ter to measure.A digital multimeter can only flash once for a short period of time within 1 second,and the maximum dis-played data is about 170 V;the pointer of a pointer multimeter can only swing slightly in 1 second,and it only swings to a-bout 120 V,making it impossible to conduct a detailed search for the fault point.On the other hand,the control circuit a-dopts a 380 V three-phase AC power supply,which may ignite during the troubleshooting process.Due to the fear of techni-cians,the troubleshooting is slow,time-consuming,labor-in-tensive,and safety is greatly compromised.Innovative re-search is conducted on the common problems currently exist-ing,and targeted fault diagnosis devices and methods are pro-posed.[Method]Three 200W light bulbs are combined to form a bulb diagnostic device,sharing one grounding elec-trode,and the other polarity is connected to the A,B,and C three-phase power supply.The bulbs are connected by the in-stantaneous suction of the 1DQJ relay.If the light is on,it means that there is no fault in the circuit.If the light is off,it means that there is a fault.The method of finding faults using the A,B,and C three-phase power supply is explained in de-tail.[Result & Conclusion]The proposed fault point diagno-sis device and method can accurately and quickly diagnose the fault point of the control circuit and greatly improve the safety in fault diagnosis.
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