13
FAAC MODEL 950 BM Door Operator
9. ADJUSTING THE SPRING
9.1. SPRING PRELOADING
If the door movement is not uniform (e.g.: door not closing comple-
tely or closing with too much force) proceed as follows to adjust the
spring preloading:
1) Cut power to the automated system and release from the door
the arm secured directly on the transmission shaft;
2) Rotate the arm until the stop-point screw (fig. 21 ref.4) is in line
with the inspection slot (fig. 21 ref. 3) ;
3) Remove the screw, while keeping the arm in position;
4) To increase preloading: rotate the arm in opening direction until
the next fixing position of the stop-point screw (fig.21 ref.5) is in
line with the inspection slot and fix the screw again.
To reduce preloading: rotate the arm in closing direction until
the next fixing position of the stop-point screw (fig.21 ref.5) is in
line with the inspection slot and fix the screw again.
5) Reinstall the arm correctly (see par.3.3.);
6) Run a new SETUP cycle.
9.2. CHECKING SPRING EFFICIENCY
We advise you to periodically check the efficiency of the spring -
this is the procedure:
1) Select the Manual function;
2) Remove the protective device of the drive system (see fig. 1 ref.
6);
1) With the door closed, trace a vertical line on the spring (fig. 22
ref.1 );
2) Open the door completely;
3) Check the line you had traced.
If the distortion is not uniform along the whole spring height (fig.
22 ref.2 ), but is irregular (fig.22 ref.3 ), lubricate the spring
with specific sliding grease.
Fig. 22
a
b
c
1
2
3
1
Closing limit-switch
2
Opening limit-switch
3
Slot for inspection of stop-point screw
4 Stop-point screw
5 Fixing positions of stop-point screw
5
5
5
4
Fig.21
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