15
FRAGMA
EN
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 (Fig. 6).
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
9
OPENING
CAMS
H
mm
4
3
5
6
8
E
7
G
F
CLOSING
CAMS
