A: Cause analysis:
BAE is the brake control signal and the feedback signal are inconsistent;
CONE is the running contactor control signal and the feedback signal are inconsistent.

When the elevator brake and running contactor are controlled by the output relay of GD300L, and if the digital input terminal is equipped with the brake feedback signal (function code 18) and the running contactor feedback signal (function code 17), and the terminal signal is not received during operation, the GD300L will trip at BAE and CONE and stop running.

Solution:
1. Check terminal wiring and terminal function code to ensure that the actual signal matches the function setting;
2. Check whether the terminal polarity setting matches the actual signal NO/NC status
3. Check whether the feedback contact of the brake and the running contactor is reliable
4. Check whether there is strong current interference source around and eliminate interference