Reasons for the Burning of Mitsubishi Elevator Temperature Fuse?
1 Answers
Fault reason: The drive board is damaged. This fault belongs to the short-circuit type, and the fault persists. The fault phenomenon is that the power supply board temperature fuse burns out immediately after power is applied. After removing all the connectors from the power supply board and reapplying power, the temperature fuse no longer burns out, thus ruling out the power supply board as the issue. Next, after disconnecting the rectifier module wires and measuring the continuity of the rectifier module, no issues were found, thereby eliminating the rectifier module as the problem. Then, after disconnecting the large capacitor wires and measuring the capacitor's continuity, the capacitor showed no problems, so we ruled out the capacitor. Subsequently, after unplugging the JAC connector from the drive board and measuring the continuity of the two remaining pins on the drive board, it showed continuity, indicating an issue with the drive board or its associated circuits. Further, after removing the drive board and measuring the continuity of the JAC connector again, it still showed continuity, confirming that the drive board was faulty. This fault was successfully resolved. Actually, we haven't ruled out the module here, as this fault could be caused by the module leading to drive damage. However, it's difficult to determine the module's condition on-site unless there is a very obvious short-circuit fault in the module.
