Usually the safety system incorporates presence sensors installed above the door opening. A presence sensor detects an object in the doorway; while the doors are closing, if an object is detected, the doors reverse immediately. They then resume their interrupted movement as soon as the object is removed.

Technologically Advanced Sensors

The ASSA ABLOY Entrance Systems sensors have been tested and approved by the ASSA ABLOY Entrance Systems test laboratory for use on ASSA ABLOY Entrance Systems's automatic sliding doors.

These presence sensors further improve the already high obstruction detection obtained with the built-in self-monitored crush force limitation.

Monitored sensors have built-in monitoring for error detection.

How to Check Your Inner and Outer Combined Motion and Presence Detection Sensors

Combined sensors are used when you want both a motion sensor and a presence sensor integrated into the same unit.

Test Procedure

1. When walking towards the door opening at moderate speed, the door should start opening when you are about 1.5 meter from the door. It shall slide open smoothly and stop in the fully open position.
2. Repeat the same procedure from the other side of the door opening. Move slowly through the door (about 15 cm/s). The door shall remain open.
3. If your door is set up for one-way traffic, the sensor on the side not intended for use shall reopen the closing door if an object is detected at a minimum of 20 cm from the door at floor level.
4. Step out of the detection field. After a short time delay the door shall slide closed smoothly.
5. Walk parallel to the inner door face (about 80 cm from the door face) to check that your motion is detected during at least the complete door opening width. Repeat the same procedure on the outer door face.
6. Open the door and move your hand from one side (right/left) into the inner door face presence field. Keep it motionless for several seconds at about 30 cm over the floor level. The door should remain open as long as you are within the detection area. Repeat the same procedure on the outer door face.

How to Check Your Side Presence Detector(s)

Side presence sensors are used for example if higher door speed is required or for installations in homes for elderly/disabled or childcare centres, to protect users from being struck by the doors during their opening cycle. When a side presence sensor detects an obstacle the door operator will not stop, but slow down the door movement to a quite safe speed. With this safe speed the door will try to push the obstruction away of the opening door.

Side Sensor Test

1. Make sure that the door starts to open.
2. Walk into the detection field of the side presence sensor on one side. The door shall not stop, but slow down to safe speed during the opening.
3. If you have a bi-parting (double) door then repeat the procedure above on the other side.

Safety System with Photocells

Alternatively the safety system can incorporate presence photocells in the door opening. If an object is breaking the infrared (invisible) beam between the photocell units, while the doors are closing, the doors reverse immediately. They then resume their interrupted movement as soon as the object is removed.

Emergency Escape

The operator can be fitted with different emergency escape units to ensure a safe evacuation of the building.

Break-out Unit PSB

The door leaves and the side screens are swung outwards when a defined pressure is applied.

The break-out function can also be used to create a wider opening. From the fully swung out position, the door leaves can be manually slid sideways, offering the possibility to transport wide objects through the opening, or to make a shop entrance more inviting during good weather.

Electrical Emergency Unit

The door is opened by means of a rechargeable battery unit in the event of a power failure. The door remains in this position until the power is restored. The operator will then resume the function set by the programme selector. The emergency unit is monitored by the operator control unit. A monitoring error means that the door opens and remains open until the error is cleared.

For further information, see General accessories.

The electrical emergency function can also be used to close the door in the event of power failure. The fire authorities make this a requirement to stop fire or smoke from spreading throughout the building.