Operating Instructions Chapter #
8 009 874/31-03-03 © SICK AG • Industrial Safety Systems • Germany • All rights reserved
13
$
Device symbol C 4000 Host (receiver), context menu Configuration draft, Edit, selection of
t
he operating mode, file card General, option PSDI window. You must then specify the
beginning and the size of the PSDI window on file card Host or Guest of the system in
question.
! $-%
To ensure that the PSDI mode operation is safe and true to the application, C 4000 in con-
nection with UE 402 evaluates three machine signals:
run-on monitoring (SCC)
Run-on monitoring evaluation is optional.
bottom dead centre (MCC-BDC)
top dead centre (MCC-TDC)
On the basis of the three machine signals, the safety light curtain can identify the
machine’s current cycle phase:
Downward movement of the press. This cycle phase involves danger.
Upward movement of the press. This cycle phase does not involve danger for all
machines.
Stopping the press. This cycle phase does not involve danger provided the “Run-on
monitoring” machine signal is not followed.
The figure below clarifies the process in time with the aid of an example of the single PSDI
mode:
a Max. 150 ms after reaching the machine cycle contact MCC-TDC, the output signal
switching devices (OSSDs) fall away.
b The operator reaches into the protective field for at least 100 ms. The protective device
therefore recognizes the interruption as the PSDI.
c The protective contacts close again no longer than 200 ms after the last PSDI.
the machine cycle for PSDI
mode operation for the
example of a press
for single PSDI mode
Machine cycle contact at
top dead centre (MCC-TDC)
Run-on monitoring (SCC)
Machine cycle contact at bottom
Cycle phase :
downward
movement of the
press
Cycle phase :
upward movement of the
press
Cycle phase :
stopping path of the press
Top dead centre (TDC)
Bottom dead centre (BDC)
Protective field
MCC-TDC
OSSDs
cba
Occupied
Open
Open
To Next Page
Loading...
