NUOVA ELETTRONICA DSP LASER, Инструкция по эксплуатации

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DSP LASER
DSPLSR01EN 51
Figure 13.10 Example of generation of high speed closing signal
OUTPUTS
The DSP Laser system provides two output channels (A and B) for the stop of the high
speed closing movement of the press. The outputs taken from RX are at solid state and are
suggested if coupled to a safety PLC. In modules ALdc and AL2B the outputs must be
realized with relay contacts without potential. The possible sticking of the contacts must be
then avoided by the installation of a protection fuse upstream the outputs.
The command circuit of the mobile table must be redundant and monitored, that is provided
with a double stop channel. The single channel must, independently from the other, be able
to stop the dangerous movements of the table. In case of fault, the command circuit must
immediately stop the press during the dangerous closing movement or, in other cases,
before the next request of intervention of the safety function or, at the latest, at the end of
the operating cycle. Moreover, the start of the new cycle must be forbidden until when the
fault has been eliminated.
Warning :
The installation must be realized in such a way that the short circuit
between the wires connecting the relay outputs is avoided. In fact, in
this case, the redundancy of the stop function would miss in case of
intervention of the device.
The outputs of DSP LASER (OSSD) must be separately connected on the single channel.
Depending on the electric characteristics, DSP LASER can directly act on the valve using
the module ALdc or AL2B. Even external relays can be used for the multiplication of the
contacts. In this case, all the relays must be force-guided, and normally open (NA) contacts
must be used to stop the movements while the relevant normally closed (NC) contact must
be used to check the correct operation at each cycle.