3.4. DESCRIPTION OF ELECTRICAL DEVICES
The figure shows the position of the devices on the machine.
1. Electric motor
it activates the drive wheel.
2. Gearmotor
it activates the spool carriage movement.
3. Accumulator batteries
they power the electric motors and the electric circuit.
4. Sensor
it features a phonic wheel and detects the spool carriage movement speed.
5. “Edge detection” sensor
it counts the performed wrapping turns.
6. Microswitch
when the bumper collides with an obstacle, it is activated to stop the machine feeding.
7. Carriage limit microswitch
it is activated when the spool carriage reaches the minimum and maximum wrapping height.
8. Photocell
it detects the height and the presence of the load to be wrapped.
9. Electromagnetic clutch
it activates and deactivates the pre-stretching roller to keep the film tensioning constant.
Information valid only for spool carriages of and “PDS” type
10. “Load cell” sensor
it detects the film tensioning and enables the variation of the pre-stretching roller speed.
11. Electric motor
it powers pre-stretching rollers.
For further details see the wiring diagram.
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