Fault Analysis Of Mitsubishi Elevator GPS And HOPE Series

Mitsubishi GPS-I elevator, all external call buttons are invalid, and all hall doors have no floor display. Handling: 1. Firstly, check the current operating status of the elevator, as if the elevator is in a dedicated state, all external calls and hall floor displays will be invalid. Upon inspection, it was found that the elevator is currently in automatic operation. 2. Check the fault code of the P1 computer board in the elevator, and the fault code displays "EC", which means "serial transmission error to the hall door"; 3. No issues were found during the inspection (or replacement) of the P1 board; 4. Layer by layer inspection of external call buttons found that all external call buttons did not have DC power output. Further inspection revealed that the power supply of the external call button on the 5th floor was faulty. After replacing the call outside the 5th floor, the fault has not been resolved. 5. Check the fuse summoned outside the control cabinet in the computer room and it is found that the fuse has been burned out. After replacement, the elevator resumed normal operation.

This case reveals that although the GPS-I elevator adopts a serial communication method in the form of a data bus, in principle, if a button on one floor experiences a serial communication failure, it will not affect the normal response of buttons on other floors. However, if there is a power failure of the external call button on a floor, especially a short circuit fault on the AC side of the rectifier power supply, it will result in all external call buttons not working properly.