SICK UE 402 - Page 25

Operating Instructions Chapter 
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8 009 874/31-03-03 © SICK AG • Industrial Safety Systems • Germany • All rights reserved
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You must ensure that the machine cycle contacts meet the following criteria:
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MCC-TDC  The contact is normally closed.
 Before reaching the top dead centre, the contact must have been
open for at least 100 ms.
 The contact must be closed again at the top dead centre.
MCC-BDC  The contact is normally open.
 At the end of the dangerous movement, the contact muss must be
closed.
 After the MCC-TDC has opened, the contact can be opened again.
 The contact must be opened again before the MCC-TDC is closed.
SCC  The contact is normally open.
 The contact must be closed when the machine is restarted.
 The contact must already be closed when the MCC-TDC closes.
 The contact may be opened shortly after the machine is restarted.
Fig.
12
:
Connecting the
machine cycle contact to
the UE 402
Tab.
7
:
Criteria for
connecting the machine cycle
contact
24 V DC
Run-on monitoring
(SCC)
Top dead centre (MCC-TDC)
Bottom dead centre (MCC-BDC)