Fromm FS380, Use And Maintenance Manual, Page: 38 / 100

32
Rev.2 01/03/2021
Use and Maintenance Manual | TURNTABLE - MAST
32
PRS (MPS) carriage
»
See Picture 19 - pag. 33
With this carriage version, the application tension of the film on the
pallet.
This carriage can pre-stretch the film according to fixed ratios
determined by interchangeable gears.
The pre-stretch ratios are:
- 150% (1 metre of film is pre-stretched to a length of 2.5 metres);
- 200%
(1 metre of film is pre-stretched to a length of 3.0 metres);
- 250% (1 metre of film is pre-stretched to a length of 3.5 metres);
- 270% (1 metre of film is pre-stretched to a length of 3.7 metres);
- 300% (1 metre of film is pre-stretched to a length of 4.0 metres).
The carriage is fitted with a sensor (4)
, connected to the outlet roller,
which measures the tension of the film applied to the pallet.
A specific electronic card integrates the signal of the sensor (4) with the
adjustment set with setting F13-16 (F32) functions in the control panel
in order to dynamically control the speed of the pre-stretch roller drive
motor and thus the film tension.
The carriage is fitted with a gearmotor which drives three rubber-
surfaced rollers (1) , (2) and (3) by means of toothed gearing.
The different transmission ratios generate different speeds of the
rollers (1) , (2) and (3) creating the pre-stretch action.
The carriage also features a set of 3 idle rollers which are used to
increase the winding angle of the film on the rubber-coated rollers.
Upon starting, the film must be loaded onto the carriage.
• Put the carriage into the Down position to make fitting the roll
easier.
• Turn the main switch to the ‘O’-OFF position.
• Push the roll (7) onto the centre pin (8) .
• Open the door and insert the film between the rollers following
the path indicated in figure (A) , the symbol with the triangles
identifies the side of the film to which the bonding agent (if
present) is applied.
• Diagram (A) is also attached to the carriage.
• Close the door making sure it is correctly secured.
• Turn the main switch to the ‘I’ -ON position.