14.3
Reducing / Increasing the “Spring pre-tension” (SPTE)
The spring pre-tension is factory set to 360° and is normally not necessary to adjust. If adjustment
has to be carried out, the electrical power must be switched on during spring pre-tension and learn,
see below.
Make sure the potentiometers "Extended closing torque" (CLTQ) and "Power assist" (POAS) are set
to 0°.
a Loosen the door stop arm. Remove if fitted on the topside, slide down if fitted on the bottom.
b Turn the potentiometer for spring pre-tension (SPTE) clockwise until the door opens to 45°.
c Loosen the drive arm fixing screw.
d Moving the door towards open position, reduces the tension, or:
Moving the door towards closed position, increases the tension.
e Tighten the drive arm.
f
Turn the potentiometer SPTE to 0°.
g Open the door to required open position, plus approx. 15 mm (5/8"), by turning the poten-
tiometer SPTE clockwise.
h Mount the door stop arm as close as possible to the open door stop block, fine- adjust with the
screw if necessary.
i
Turn the potentiometer SPTE to 0°.
j
Push the LEARN BUTTON.
k Let the door do the learn cycle without touching it.
Note! Max. allowable spring pre-tension is 720° which is recommended for OHC installation. Over-
tension may damage the spring or overheat the motor.
210°
SPTE
180°
90°
69
Issue 2013-02-10
1009937-EI-1.0
14 Changing group of parameters
