Implementation Of The Visual Point; Wiring Instructions - ALFAMATIC Visual Point VP2STEP1 Installation Manual

3 Implementation of the VISUAL POINT

The VISUAL POINT is divided into two opto-isolated sections. The first section mounts the control
electronics and the conditioning and transducer interface electronics. The second section mounts the
electronics of the digital inputs and outputs.
The two sections have separate power supplies both at 24VDC.
The power supply of the two sections can be the same.
In the version with container and internal power supply ( Figure2), the power supply of the two
sections must be taken from the power supply itself which in turn must be powered by the mains
voltage interrupted by the switch on the rear panel. The internal power supply allows direct
connection of the instrument to the mains, accepting voltages from 100VAC up to 240VAC at both
50Hz and 60Hz.
Figure2

3.1 Wiring instructions

The VISUAL POINT has different input and output signals. The force and position transducers and
the command signals are connected at the input. At the output there are the signals to control the unit
descent enabling valve, the protection closing valve and the signalers.
The input signals to the instrument can be with clean contact or with positive logic at 24Vdc, ie with
PNP transistor output.
The VISUAL POINT outputs, when active, supply a voltage of 24Vdc. The maximum load of each
outlet is 15 watts. For higher loads it is necessary to use support relays. The total maximum load
supported by the instrument when it has the internal power supply is 50 watts.
The PLC must have positive logic at 24Vdc, therefore with PNP type inputs and outputs. The signals
indispensable for the functioning of the VISUAL POINT are the following: TDC, START, GO,
GOOD, REJECTED. The RESET signal can be connected directly to the positive if you don't want
the block of the instrument in case of rejected piece.
The wiring rests on various numbered removable terminal blocks (X1, X3, X4...). Each terminal of
each terminal block is also numbered. For example, when terminal X5.7 is indicated, reference is
made to the seventh terminal of terminal block X5.
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