NARGESA 2020-240, Instruction Book, Page: 20 / 54

- 19 -
5.3.3. Roller position controllers
To control each of the pistons producing upward and downward movement of the left and right hand
rollers, the control desk has two different areas, one at each side of the front of the control desk.
Obviously, as they carry out identical functions regarding the control of each of the pistons, we will explain
the operation generically, without specifying which piston is being referred to, to make it more
comprehensible.
• Position indicator: The position indicator is formed by a collection of 7 - segment displays, informing both of
the current position of the piston in question, and the maximum position limit value of the piston in
question. Obviously, these two parameters, although they are displayed on the same indicator, cannot be
shown simultaneously. To select the information you wish to see on the display, use the selector. In
one position it will display the current position of the piston being controlled and in the other, the
maximum position limit value of the piston in question. In addition, the position indicator has three LED
lights. The upper (when on) indicates that the piston still has upward travel to reach the limit (configured
by the user with a potentiometer). The central LED is a voltage indicator, and will always remain on while
the machine has voltage. Finally, the lower LED (when on) indicates that the piston still has downward
travel to reach the minimum limit (established electronically).
• Selector: As commented above, the selector is used to switch between the information displayed on the
position indicator of the piston being controlled. In one of its two positions, it enables the viewing of the
current position of the piston, while in the other it offers the maximum position limit of the piston in
question.
• Raise button: Makes the piston in question move upwards while being pressed, until it reaches the
maximum position limit.
• Lower button: Makes the piston in question move downwards while being pressed, until it reaches the
minimum position limit.
• Adjustment potentiometer for the maximum limit: Used to adjust the maximum limit position to be
reached by the piston.
5.3.4. Direction of rotation of rollers
On the front of the control panel, in addition to the aforementioned controls, you can also find two buttons
to control the direction of rotation of the rollers. To do this, just press and maintain pressed the button
corresponding to the desired direction, left or right.