Programmable Output Setpoint; Job Selection Via Inputs - ALFAMATIC Visual Point VP2STEP1 Installation Manual

a certain point will return to zero. This is the exact position of the encoder zero mark. Now pull the
encoder back to disengage the pinion from the rack, hold it in this position and return the cylinder
back to TDC. Keeping the encoder released from the rack, lower the cylinder by about one millimeter.
At this point it is possible to leave the encoder. Raise the cylinder to the top dead center and check
that the instrument indicates a value between –3 and –1 mm.
To verify the exact positioning, switch the instrument off and on again: at this point the quota must
be zero. Lower the cylinder with the lever and bring it back to the top dead centre: at this point the
instrument must display a negative value of a few millimetres.
3.5.2 For standard Alfamatic presses
First of all, press the emergency button of the press, turn on the instrument and open the upper cover
of the rack block, which is closed by two cross-head self-threading screws. Inside you can see the
encoder pinion. Unscrew the two screws that fix the encoder and move it upwards, in this way, on
the instrument display, you will see the value change which, at a certain point, will return to zero.
This is the exact position of the encoder zero mark. Now move the encoder about one millimeter
down so that the display reads –1 millimetre. By pulling the encoder back it is possible to release the
pinion from the rack, in this way it is possible to return the encoder to its original position without
the instrument modifying the position. In practice, it must be possible to fix the encoder and display
a value between –3 and –1 millimeters as the quota.
To verify the exact positioning, switch the instrument off and on again: at this point the quota must
be zero. Start the press and return it to the top dead centre: at this point the instrument must display
a negative value of a few millimetres.

3.6 Programmable output SETPOINT

The VISUAL POINT has a SETPOINT output which is normally activated when the start position is
measured (see user manual) and deactivated when the stop value is reached. This can be used to start
the work phase after the approach phase.
By changing the configuration value it is possible to cause the SETPOINT output to be activated
when a settable quota or force is reached.
Always changing the configuration value it is possible to make sure that the SETPOINT output is
deactivated not when the cylinder stops but only when the press has returned completely back (TDC
input active) and, with the rejected piece, the reset is not given . In practice, this configuration makes
it possible to connect a decelerator or a gripper which holds the piece in position to the SETPOINT
output.
Note:
The SETPOINT output is activated only when the TDC input is not active.
The SETPOINT output is activated even without the START signal.

3.7 Job selection via inputs

The VISUAL POINT supports automatic job selection via inputs. This automatic selection can be
useful for the automatic recognition of the mounted tool. To use the automatic job selection it is
necessary to enter how many jobs must be able to be selected, to do this it is necessary to change the
"Number of selectable jobs" value in the configuration menu.
The combination of inputs is binary. The maximum number of jobs that can be selected is 64.
By connecting a single selection input it is possible to choose a maximum of 2 jobs ; by connecting
two inputs it is possible to select 4 jobs; with three inputs 8 jobs and so on.
The wiring takes place in a terminal block inside the VISUAL POINT instrument marked X3.
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