Chapter
4
Operating Instructions
UE 440/470
34
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8 010 432/P097/14-03-05
Configurable functions
4.3.1
Principle of PSDI mode
In cycle mode, protective field interruptions are evaluated at the ESPE for control of the
press sequence. The machine first waits at the top dead centre for the number of
interruptions by the operator in the protective field of the ESPE set in the PSDI mode type
(with some presses, interruption is possible after the bottom dead centre). The safety
controller releases the dangerous movement automatically after the number of
interruptions required for the set PSDI mode type.
1-PSDI mode
In this context, 1-PSDI mode means that the safety controller first stops and locks
movement at the top dead centre and then waits for a valid PSDI interruption in the ESPE.
If the operator now interruptions in the protective field and then retreats, the safety
controller releases movement (
). If another interruption occurs during the dangerous
movement, however, the safety controller immediately cuts off the dangerous movement.
2-PSDI mode
In comparison to 1-PSDI mode, 2-PSDI mode means that the safety controller stops the
press after a successful run-through at the top dead centre and then evaluates two
interventions within the permissible PSDI time for rerelease of the dangerous movement
(
and
).
Context menu device symbol UE 440/470, command
Edit configuration draft…
in
Edit
configuration draft
window, element symbol
function module 1-PSDI (hydraulic presses)
,
2-PSDI (hydraulic presses)
,
1-PSDI (eccentric presses)
or
2-PSDI (eccentric presses)
,
command
Element wizard...
,
PSDI mode
tab.
Fig. 6: Schematic layout of
the 1-PSDI mode
Fig. 7: Schematic layout of
the 2-PSDI mode
!