The SIDOOR ATD400T interior railway door drive is an "intelligent" door drive which enables gangway doors to be opened and closed at adjustable speeds and accelerations.

The maintenance-free drive unit consists of a speed-controlled DC motor with non-self-locking gearing.

• SIDOOR M3 geared motor
  (24 V DC/1.8 A; motor for max. overall door leaf weight 180 kg, degree of protection IP40)

Must be ordered separately, see "Geared motors".

Operation of the door drive does not require limit switches. The door width and the "OPEN" and "CLOSED" positions are determined automatically.

The current operating states are shown on a 7-segment display directly on the SIDOOR ATD400T RELAY controller. They can also be displayed externally using the Software Kit or Service Tool, see "Additional units".

Forces are transferred via a toothed belt, which passes over a deflector unit and can be fitted with two door clutch holders. The accessories are not included in the scope of supply, see "Accessories".

This enables it to drive both one-sided and centrally opening doors.