BOOM ARM ASSEMBLING
To assemble the boom arm follow these 3 steps:
1 - Insert the boom hub in a vertical position in the spline shaft (Fig. 3). Attach the
backplate to the hub with 2 screws DTB10X50, 2 washers DRL10X20Z and 2 nuts
M10 (Fig. 4), making sure to tighten the screws in an alternating manner in which the
strike is parallel to the plane of the hub.
2 - Fix the U shape profile onto the base of the fixing hub, by using the four DTB8X20I
screws and their washers. Do not tighten the screws to allow the boom arm to slide
into the fixing hub (Fig. 5).
3 - Fit the black plastic caps at the both ends of the boom arm. Insert the boom arm into
the fixing hub and fasten the four screws tight (Fig. 6).
The gear unit is irreversible so no external locking device is necessary to keep the barrier
in securely engaged in close position.
ADJUSTING THE BALANCING SPRINGS
No balancing springs are generally provided with the barrier.
It is therefore necessary to order the balancing springs in according with the SPRINGS
CHOICE AND ADJUSTMENT TABLE. In fact, the kind of springs suitable for the balancing
depends on length and kind of the boom arm, kind and number of accessories installed.
If the boom arm tends to drop too quickly when it is disengaged from the gearmotor, adjust
the balancing springs in the following way:
1 - With the boom arm engaged to the gearmotor, press the open command of the control
board to lift the boom arm until the barrier is completely
opened.
2 - Switch off the motor power supply. Screw clockwise the ring
nut of the balancing-unit to increase the spring compression
degree. Use the second ring nut to block the first one.
To check if the boom arm is balanced perfectly, disengage the
boom arm from the gearmotor and move the boom by hand. The boom should slightly
tend to rise.
LIMIT SWITCH SETTING
The barrier is supplied with the electrical limit switches and the mechanical stoppers
already set to allow optimum boom arm movement.
If the base plate cannot be cemented on a horizontal plane, the boom might be not
perfectly horizontal or vertical. To avoid this, it is possible to trim the trajectory of the boom
by adjusting the mechanical stoppers and the electrical limit switches (Fig. 7):
1 - Use a No.19 hexagonal wrench to loosen the retaining nuts
(F)
and a No.8 allen key
to loosen or tighten the countersunk screws
(G)
. Trim the mechanical stoppers to find
the desired boom arm trajectory angle.
2 - Having done this, the electrical limit switches now have to be set. To do this you
must use a Philip’s head screwdriver to loosen the fastening screws
(E)
of the electric
limit switch cams (Fig. 8). Once the rod is positioned at the base of the mechanical
stop plate, just move the cams as shown in Fig. 9 in order to make the micro limit
switch trip.
3 - Fasten tight the fixing screws
(E)
.
SLOWING ACTION ADJUSTMENT
Normally the barrier is supplied with a slowdown limit switch already adjusted to allow
the ideal rod motion.
In cases where it is necessary to change the slowdown parameters, just adjust the
appropriate cams (Fig. 10) by loosening the fastening screws with a Philip’s head
screwdriver
K
(Fig. 10).
The slowdown cams are independent from the limit switch adjustment cams (by moving
them, the Open and Close cams are not modified) and they are separate from each other
(Slow opening - Slow closing).
After you have adjusted them, tighten the fastening screws and check that the barrier is
working properly by making a complete opening and closing movement.
11
10
K
SLOW CLOSING CAMS
SLOW OPENING
CAMS
20
G
B
9
OPENING CAMS
4
3
5
6
8
E
7
G
F
CLOSING CAMS
H
mm
