F
2910376
00.
fm
ID
M
English
4
Use and maintenance manual
Booklet
3
SPOOL CARRIAGE UNIT
2
F-
Wrapping Tension
R –
Film break point.
Film tension is uneven during load
wrap; in fact, the load exerts a
greater request for film on the cor-
ners. This translates into an in-
crease in wrapping tension
(F)
.
The spool carriage is equipped
with an electronic system that
guarantees contstant tension
(F)
during wrapping.
The system consists of a D. C.
starter for the variation of the mo-
tor’s speed.
DESCRIPTION OF THE ELECTRICAL DEVICES
6
The illustration shows the position of the devices.
–
Photocell (A)
: detects the presence and the height of the load to be wrapped.
–
Sensor (B)
: it detects the film tensioning during wrapping and it enables the adjust-
ment of the speed of the pre-stretch rollers. In case of film breakage or end it enables
also the machine stop.
–
Electric motor (C)
: it activates the pre-stretch rollers. It is equipped with one inverter
for the adjustment of the number of revolutions.
R
1
R
0
F
R
F
S
=
F
ID
M
-291454003
0
0.
Electric motor (C)
"Load cell" sensor (B)
Photocell (A)
ID
M
-29156800300.
