Professional maintenance of various domestic and international inverters, circuit boards, power board touch screens, etc. A Mitsubishi SP-VF elevator burns CR-3A insurance phenomenon: after the elevator stops, sometimes after closing the door, sometimes after opening the door, the overload bell rings and the elevator cannot start. Sometimes after the ladder is locked, it cannot be started when the ladder is opened the next day. After investigation, the CR-3A insurance on the control cabinet was blown, and after the insurance was replaced, the elevator returned to normal, and the number of occurrences of the fault varied during the day. Analysis: CR-3A insurance is 48VDC circuit, and the circuit related to this voltage is: car top leveling sensor switch PAD, hoist upper and lower terminal deceleration switch, overload switch, safety touch panel switch, car internal function switch, etc. Shanxi Taiyuan Inverter Maintenance Treatment: Because the well was in the water, the above switch was inspected and rusted. No abnormalities were found. The resistance between the TA25-TA26 on the control cabinet was measured by a multimeter. For the 48VDC related plug, when the AB plug is discharged, the meter shows that it is not short-circuited. According to the drawing, the line number of AB-J05 is 325, 48V goes down to the line on the car door panel, and the safety touch is measured on the door panel. When the board was wired, it was found to be short-circuited to the ground, and the removal of the line was normal. Taiyuan inverter repair http://news.chinawj.com.cn
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