15. Reducing / Increasing the "Spring Pre-tension" (SPTE)
The spring pre-tension is factory set to 210° and is normally not necessary to adjust. If adjustment has to be carried out, proceed as follows:
Note! Max. allowable spring pre-tension is 210°. Over-tension may damage the spring or overheat the motor.
- Loosen the door stop arm. Remove if fitted on the top side, slide down if fitted on the bottom.
- Turn the potentiometer for spring pre-tension (SPTE) clockwise until the door opens to 45°.
- Loosen the drive arm fixing screw.
- Adjust tension based on door position:
- Moving the door towards open position reduces the tension.
- Moving the door towards closed position increases the tension.
- Tighten the drive arm.
- Turn the potentiometer SPTE to 0°.
- Open the door to required open position, plus approx. 15 mm, by turning the potentiometer SPTE clockwise.
- Mount the door stop arm as close as possible to the open door stop block, fine-adjust with the screw if necessary.
- Turn the potentiometer SPTE to 0°.
- Push the LEARN BUTTON.
- Let the door do the learn cycle without touching it.
16. Installation and Adjustments
16.1 Complementary Safety Devices (Swing Doors)
If there is any risk for finger jam, appropriate safety measures must be taken:
- Internal Doors: Add finger protection strip at the hinge side (Article No. 833334).
- External Doors: Add finger protection roll (Article No. 833333).
16.2 Swing Doors Opening and Closing Time
Adjust, as a minimum, the operator's opening and closing time according to the door specifications.
16.2.1 How to find the correct opening and closing time
- Measure the door width.
- If the door weight is unknown, follow the instructions in the section "Diagrams for door weight".
- Consult the standard Minimum Swing Door Opening/Closing Time diagram (refer to product physical manual for the visual chart) to find the correct minimum opening/closing time “t”.
Example Calculation:
If the door width is 1.1 m and the door weight is 50 kg, the minimum opening and closing time will be approximately 3.5 seconds.
If the door width is 1.1 m and the door weight is 50 kg, the minimum opening and closing time will be approximately 3.5 seconds.
16.3 Diagrams for Door Weight
To determine the weight of a door leaf based on its dimensions and material:
- Measure the door width (DW) and the door height (DH) in metres for one door leaf only.
- Calculate the area:
DW x DH. - Select the diagram corresponding to your type of door and the actual glass thickness to find the weight.
16.3.1 Aluminium frame with glass
Calculation Example:
Consider an aluminium door with measurements:
- Width (DW) = 1.5 m
- Height (DH) = 2 m
- Glass Thickness = 12 mm
Calculation: Area = 1.5 x 2 = 3 m².
Result: Using the "Aluminium Frame with glass" reference (see physical manual), for an area of 3 m² and 12 mm glass, the door weight is approximately 95 kg.
Note! The weights can vary depending on the door design (the table shows only typical values).
Typical Glass Thickness references for weight calculation:
- 8/24/8 Insulated Glass
- 12mm Glass
- 6/10/6 Insulated Glass
- 10mm Glass
- 8mm Glass
- 6mm Glass