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2 Implementing VISUAL POINT
The VISUAL POINT is divided into two sections with each other opto-isolated. The first section
features the control logic and electronics interface to transducers. The second section features the
electronics for digital inputs and outputs.
The two sections have separate power supplies, both at 24VDC.
Both sections can be supplied with a common power source.
The internal power supplier (Picture 2) allows the direct connection of the instrument to the net
electrical supply.
Tensions accepted range from 100VAC up to 240VAC both 50Hz and 60Hz.
Picture 2
2.1 Operating of the instrument
Attention: the VISUAL POINT is not (and could not be) a safety device: the descent of the press
must be entrusted to external elements. The VISUAL POINT synchronises the descent for its
operation. The GO Output is usually connected serially to the chain of the cylinder descent. In
short, if the CSQ-Visual activates the GO enabling output, the cylinder must not descend if it is not
safe
Operation takes place as follows: when the START input is activated by an external command, the
VISUAL POINT, if ready, activates the protection descent output (PROTECTION) where present
and enables the cylinder descent (GO). When the protection is closed, a safety device must activate
the cylinder until the VISUAL POINT removes the cylinder descent enabling signal (GO). The
VISUAL POINT then commands the arrest of the press, removing the GO signal, controls the
curve until the force begins to diminish or is activated by way of the T.D.C. input (withdraw
cylinder signal). Only then does it indicate whether or not the piece is good or a reject.
If the piece is good, the GOOD output is activated and the PROTECTION output, where present, is
deactivated. If the piece is a reject, the REJECTED output is activated intermittently and the
PROTECTION output, where present, is left active. When the operator presses the reset button,
which can be external or always active, the instrument maintains the REJECTED output as fixed
and removes the PROTECTION output.
The RESET input can be connected directly to +24 V and left always active, so that the instrument
is always ready to execute a new cycle.
