During the door closing sequence, voltage on terminal A2 of the door motor armature is _______.

During the door closing sequence of an elevator door operator, the voltage on terminal A2 of the door motor armature is typically negative. This is due to the way electric motors are controlled within the door operator system. When the door is closing, the motor is configured to rotate in a direction that causes the door to move towards the closed position.

In many systems, the polarity of voltage on the terminals of the motor is reversed for different operations. When the motor is energized to close the door, the voltage on terminal A2 becomes negative relative to terminal A1, which is crucial for the motor to function correctly during this phase. This negative voltage helps drive the current in the appropriate direction, allowing the door to transition smoothly into the closed position.

Understanding the dynamics of voltage polarities in door operator systems is essential for troubleshooting and ensuring that elevator door mechanisms operate efficiently and safely.