NUOVA ELETTRONICA DSP LASER, Instruction Manual, Page: 15 / 66

DSP LASER
DSPLSR01EN 11
9. Introduction
The safety device DSP LASER is a visible laser emission guard which, inserted in a more
general control system, contributes to protect the operator in the use of press brakes for the
cold working of the metals and is constituted by:
•
one transmitter DSP LASER TX powered at 24Vac or 24Vdc,
•
one receiver DSP LASER RX powered at 24Vac or 24Vdc which moreover includes:
the logic for the control of the operation modes, the function of automatic monitoring of
the overtravel and the two solid-state outputs OSSD,
•
one DSP LASER AL module (optional) with a series of variations.
Each of them is enclosed within its own case.
The activation of the receiver is made possible only by the emission generated by the
transmitter, which is electrically connected to by the synchronism. An emission generated
by an identical transmitter, but not electrically connected with the receiver, cannot activate
it.
Main
task of “DSP LASER” is detecting, within the limits defined by the detection capacity of
the instrument, the intrusion of any opaque physical element into the “
detection area
”. The
detection area can be defined as a “laser light solid” which starts from the transmitter and
arrives to the receiver and whose section is represented in Fig. 9.1. The interruption of the
laser beams illuminating the receiving elements, causes the detection of the occurred
interruption. The detection of the interruption of one or more of the receiving elements is
then managed by the system to issue or not the passage to state OFF of the OSSD outputs.
The device has been then designed to activate, in dangerous conditions, the functions for
the stop of the movement of the dangerous parts.
Fig. 9.1 Whole detection area
These functions have been realized providing, in output from the two OSSD, two different
ON/OFF electrical signals. The state ON corresponds to the condition for which the DSP
LASER system does not detect the conditions for which the downwards movement of the
machine must be inhibited or stopped, while the state OFF detects them. Various can be
the causes for which the outputs are set to the state OFF. The main ones are: the lack of
collimation between the two TX and RX components (caused, for example, by the intrusion
of an element into the detection area), the lack of power supply to DSP LASER, 30 hours of
continue operation, failed check of the stop space, failure of the DSP LASER equipment
itself.
The main causes of fault or wrong operation are signalled by a precise configuration of the
LEDs present in RX. For information see par.12.1.
The OSSD outputs, properly inserted in the electric circuit of command of the dangerous
part of the equipment, enable, in ON state, the possibility to command the movement (start
function) and, vice versa, to inhibit or stop it in OFF state (stop function).