NUOVA ELETTRONICA DSP LASER, Instruction Manual

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DSP LASER
20 DSPLSR01EN
Blanking function
“Enabling by Operator”
The control circuit of DSP LASER uses these command signals of the press-brake for the
management of the blanking function:
•
the Press brake closing pedal (IN PD) signal
•
the Press brake opening (IN AP) signal
States of the cycle Abbreviation Cycle Phases
Maximum top dead centre
Top dead centre PMSM
PMS
A
B
Speed change point PCV D
C
Bottom dead centre PMI
The key selector set to the position of the operating mode 2, signalled by the blinking of the
big yellow LED present on the front part of the receiver, selects the blanking function.
The actuation of this function, however, takes place only by the “Enabling of the Operator”,
that is when this presses Press brake closing pedal (IN PD). This first pressure does not
generate any machine movement, but serves to activate the blanking function. At the next
pressure of the Press brake closing pedal (IN PD), the OSSD outputs will go to status ON
and the machine will be enabled to perform the downstroke at High Speed up to PCV with
the front part in blanking, provided that the central area is not obstructed.
In the event that the downstroke pedal is to be used, the press control circuit must be able
to detect the blanking condition, for example via the modal switch, in such a way that the
downstroke of the crossbar is inhibited at the first pressure of the pedal.
The Blanking function is moreover subjected to a periodical check in order to avoid the
machine could be inadvertently left in blanking state or to avoid a wrong use of the function.
The pedal or the push-button, on the first pressure, must not remain pressed for more than
5 seconds otherwise, at the release, the Blanking function will not be activated. Once the
blanking function has been activated, in order its state is kept active, the pedal commanding
the downstroke must be pressed within 5 seconds.
The blanking state will remain active until when, once executed the phase C of the bending
cycle, the Press Brake opening (IN AP) signal will deactivate it, passing to state OFF.
The Blanking function must be deactivated at the end of each cycle of the machine, before
this can execute the next cycle. This is strictly ensured by the Press brake opening (IN AP)
signal. Then, for the next bending cycle with the blanking function of the front area, a new
“Enabling of the Operator” is necessary, who must repeat the operation described before.
If, after the phase C of the bending cycle, the Press brake opening (IN AP) signal is not
activated, the blanking function remains active, at most, for 10 minutes from the moment the
press has began the downstroke.
This avoids possible tampering on the Press brake opening (IN AP) signal which can cause
the exclusion of the characteristic of starting a bending cycle with the blanking function
active.