Common Faults in Elevator DC Door Machine Systems

Phenomenon 1:
The elevator does not slow down when opening the door. There is a collision sound. Reason: The door cannot reach the deceleration limit when opened. The door deceleration limit is broken and cannot be connected. The door deceleration resistor has been burned out or the middle clamp has poor contact with the resistance wire.
Phenomenon 2:
The elevator does not slow down when closing the door, but there is a collision sound when closing the door quickly. The reason is that the door cannot reach the deceleration limit when closed. The door deceleration limit is broken and cannot be connected. The door closing deceleration resistor has burned out or the middle clamp has poor contact with the resistor wire.
Phenomenon 3:
The speed is too slow when opening or closing the door. Reason: The deceleration limit for opening or closing the door is broken and in a normally connected state.
Phenomenon 4:
The door cannot be closed but can only be opened (JKM and JGM operate normally). Reason: It may be that the limit of the closing terminal is broken and always in a disconnected state.
Phenomenon 5:
The door cannot be opened but can only be closed (JKM and JGM operate normally). Reason: It may be that the door opening terminal limit is broken and always in a disconnected state.
Phenomenon 6:
The door cannot be opened or closed (JKM and JGM operate normally). Reason: It is possible that the total resistance of the door opening and closing has been burned out.