A door operator may be triggered in various ways:
✅ Approach Sensor (such as a radar sensor) – the door opens when a user approaches it.
✅ Pushbutton – the door opens when a user presses a button.
✅ Automatically (in the case of elevators)
✅ Access control – the door opens when the an Access Control System determines the user is authorized to go through.
A sliding door operator reopens the door if it closes into an obstacle. However, most operators use sensors to prevent the door from ever coming into contact with a user in the first place.
The simplest sensor is a light beam across the opening. An obstacle in the path of the closing door breaks the beam, indicating its presence. Infrared and radar safety sensors are also commonly used.
In the instance that an object is not detected by a safety beam or curtain, the BLDC motor can detect the resistance of the door pushing on the object. If such resistance is found, the door opens back up.