Operating Instructions Chapter #
8 009 874/31-03-03 © SICK AG • Industrial Safety Systems • Germany • All rights reserved
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You can release the PSDI control in two different ways:
Limited: The safety light curtain only evaluates interruptions within the stopping phase
as a PSDI, i.e. if the machine cycle contact was made for the top dead centre (MCC-TDC)
and has also fallen away again.
Not limited: The safety light curtain also evaluates interruptions within the upward and
stopping phases as PSDIs if the machine cycle contact is made for the top dead centre
(MCC-TDC) and has not yet fallen away again. This configuration makes higher clock
speeds possible.
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If you wish to set the release of the PSDI control to Not limited, then you must make
sure at the machine side that the machine stops automatically at the top dead centre.
For this you must always observe the standards that apply for your specific applica-
tion/machine situation.
Device symbol C 4000 Host (receiver), context menu Configuration draft, Edit, selection of
the operating mode, file card General, option Enable PSDI control.
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The purpose of run-on monitoring is to detect any failure of the machine brake at the top
dead centre. If you activate run-on monitoring, the UE 402 in front of the stroke release
monitors whether the SCC is still closed, i.e. whether the machine has actually stopped at
the top dead centre.
If the press exceeds the SCC before the operator has intervened once or twice depending
on the PSDI mode, the C 4000 switches to lock-out.
The SCC contact must be connected for run-on monitoring.
Device symbol C 4000 Host (receiver), context menu Configuration draft, Edit, selection of
the operating mode, file card General, option Run-on monitoring active.
Eccentric presses must not be allowed to stop at the bottom dead centre because their
construction does not enable them to stop in this situation. In eccentric press mode, the
safety light curtain mutes the protective field function in this phase. The muting begins
when the machine cycle contact for the bottom dead centre is reached. You must ensure
that the machine cycle contact for the bottom dead centre is not made until after the end
of the dangerous movement. The muting ends when the machine cycle contact for top
dead centre is reached, but no longer than after 30 seconds.
When you configure the eccentric press mode you must also connect the machine cycle
contact for the bottom dead centre (MCC-BDC). The connection is described in chapter 5.5
“Machine-cycle contacts” on page 24.
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In eccentric press mode, you must take suitable measures to ensure that no dangerous
state can occur while muting is active.
Device symbol C 4000 Host (receiver), context menu Configuration draft, Edit, selection of
the operating mode, file card General, option Eccentric press mode active.
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WARNING
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