1, check whether the main power supply is three-phase five-wire system, and whether the grounding of the main engine, control cabinet, trunking and car top junction box is normal.
2. Measure all communication plugs (including vehicle boards and all display boards) with a multimeter to see whether there is a short circuit or an open circuit between the four wires, and measure whether there is a short circuit to the ground and a short circuit to the shielding layer wires.
3. Measure the resistance values of all communication boards to detect whether they are damaged.
4. Connect all boards, paste the terminal resistance displayed by the bottom display board and trolley, reset the address code, plug in the communication in the computer room, and directly measure whether the communication TXA+ and TXA- on the motherboard are 60 ohms in case of power failure. Fujita Elevator is a research and development company focusing on the elevator field, which is committed to meeting the equipment needs of different types of buildings and providing vertical transportation solutions for residential, commercial complex, office building, public building, transportation hub, hospital and other projects with diversified specifications of electric and escalator products. Fujita Elevator is engaged in business activities all over the world and has several production bases.