Introduction; Important Installation Notes; Working Principle - ALFAMATIC Visual Point VP2STEP1 Installation Manual

1 Introduction

This manual describes the operations required to connect the VISUAL POINT to the machine and to
make it operational.
1.1 Important notes for installation
Please read these notes:
Always check the supply voltage required by the instrument before proceeding with the
wiring of the same.
This manual ONLY refers to the VP2 version with the VP2STEP1 board of the instrument.
The VP2 version is made up of three electronic boards: one on the front with the display,
one horizontal for interconnection and one vertical on the back with the terminal blocks.
This tool is not (and could not be) a safety device: the movement of the press must be
entrusted to external elements. The tool simply synchronizes the movement of the press for
its own operation.
It is very important that the unshielded end of the load cell cable be as short as possible
When the machine has electric motors, these must be equipped with an anti-interference
filter and must be controlled by means of semiconductor devices.
Always connect the instrument case to the earth conductor.
1.2 Principle of operation
Attention: the VISUAL POINT is not (and could not be) a safety device: the movement of the press
must be entrusted to external elements . The VISUAL POINT synchronizes the descent for its own
functioning. Typically, the GO unit enabling output is connected in series to the cylinder descent
chain. In other words, if the VISUAL POINT activates the GO output, the cylinder must not moving
if it is not in safety.
Operation occurs as follows: when the START input is activated by an external command, the
instrument, if ready, activates the protection descent output (PROTECTION), and enables cylinder
descent (GO). When the guard is closed a safety device must operate the cylinder. When the tool
removes the cylinder enable signal (GO) the press must go back. The VISUAL POINT, therefore,
commands the stop of the press by removing the GO signal. The VISUAL POINT continues to
control the curve until the force begins to decrease or the TDC input is activated. Only then does it
provide the pass or fail signal.
If the piece is good, the GOOD output is activated and the PROTECTION output is deactivated.
Conversely, if the piece is rejected, the REJECTED output is activated intermittently and the
PROTECTION output is left active. When the RESET input is activated or the operator presses the
RESET
button on the keyboard, the instrument keeps the reject output fixed and deactivates
the protection output.
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