What is the reason for the Mitsubishi Elevator 89 light not lighting up?

[AlejandroLynn]

The reasons why the Mitsubishi Elevator 89 light does not light up are as follows: The elevator safety circuit is not connected: The 29# indicator is abnormal, and the 89# light-emitting diode cannot light up normally. Sometimes the 89 light goes out and immediately lights up again, which may be a problem with the safety circuit. Upper and lower limit switches: Check whether the upper and lower limit switches are normal, whether the wiring is correct, and whether there is any broken skin or grounding in the circuit. Temperature fuse burned out: The 89 light also cannot light up. You can check the white ceramic block (temperature fuse) on the power board and measure whether the continuity of the AB terminals of the temperature fuse is normal. Brake gap is too small: After long-term operation, the friction of the main traction wheel is too high, the main motor temperature rises, and the brake temperature is too high to detect. The elevator self-protects, causing the elevator to freeze, and the fast and slow cars cannot start (unless reset or powered off). Although the 89# light may not necessarily go out in this case, it is also a manifestation of abnormal operation of the 89 relay.