Four Maintenance Cases Of Mitsubishi Elevator
Fault 1: HOPE elevator has E7, DC overvoltage and undervoltage. Check that the temperature fuse on the power board (P203722B000G01) has been burned out, and further check that there are no problems with the capacitor, IGBT, and motor coil. Replace the temperature fuse resistance of 154 degrees 2A and 220 ohms, replace it, and then power on and burn it. It was later found that it was caused by a short circuit in the TR1 field-effect transistor on the power board (P203722B000G01).
Fault 2: After running a HOPE elevator for a period of time, the IGBT was burned. The voltage was checked and there was no problem. After replacing the frequency conversion module, the frequency conversion module was short circuited again within a month, causing the E-board to burn out. After replacing the frequency conversion module and E-board, it was not long before they burned again. After conducting a detailed inspection, it was found that the anti surge board (p203724b000g01) on the frequency conversion module had capacitance loss. After replacing the anti surge board, E-board, and frequency conversion module, the frequency conversion module was never burned again.
Fault 3: The 89 relay is not working, and the elevator safety circuit is connected. The external circuit is normal, but it cannot be started (the 89 relay is not working, and the 89 indicator light is not on). Firstly, once again confirm the normal operation of the 29 safety circuit. We cannot assume that the safety circuit is normal just because the 29 indicator light is on. The safety circuit is directly input to the P1 board through the 79 terminal switch and current limiting. Therefore, sometimes lower voltage can also be input to the P1 board, causing a false appearance of the safety circuit being normal. However, lower voltage cannot push the action of the 89 relay. So when the short circuit of the safety circuit is not very serious, it may not burn the fuse, but cause this phenomenon. We can measure the ground resistance of the safety circuit and determine the voltage at each point of the safety circuit. If the safety circuit is normal, we are checking whether the W1C-P09 pin of the P1 board outputs low voltage and is disconnected. If the safety circuit is normal, we are checking whether the W1C-P09 pin of the P1 board outputs low voltage. As the output of the P1 board at this point is easily damaged, as long as we look at the output transistor and wiring of the p1 board, we can generally find the cause of the fault.
Fault 4: When the door is half closed and opens again, the connection wire of the safety contact plate on the door may be broken or short circuited due to frequent movement of the door. This is caused by the disconnection of the safety contact plate wiring when the door is moving, causing the door to partially close and open again. By measuring the continuity between 420 and 30, 420 and 30A, it can be determined that the problem is on the other side. This fault is generally caused by broken wires between the safety contact plate and the light curtain, as well as poor contact or improper adjustment of the safety contact plate switch. The elevator has a bend between the light curtain plate and the plug-in on the right side of the light curtain line, and the internal wire contact is poor. This broken wire is a common fault of the light curtain.
