Operating Instructions Chapter 5
C4000
Electrical installation
8 009 221/16-11-00 © SICK AG • Safety Systems • Germany • All rights reserved 33
5.4 External Device Monitoring (EDM)
The EDM checks if the contactors actually drop when the protective device responds. If,
after an attempted reset, the EDM does not detect a response from the switching amplifier
within 300 ms, the EDM will deactivate the OSSD switching outputs again.
Fig. 26: Connecting the con-
tact elements to the EDM
The EDM is implemented electrically by both N/C contacts (k1, k2) having to close when
the contact elements (K1, K2) reach their position of rest by the light path disruption. 24 V
then apply at the input of the EDM. If no 24 V apply after a light path disruption, one of the
contact elements is defective and the EDM prevents the machine restart.
Notes
· The EDM remains active after switching the device off and back on again. It can be deac-
tivated only with the reset function (see page 13).
n
· If you connect the contact elements to be monitored to the EDM input, then you must se-
lect the operating mode EDM in the CDS (Configuration & Diagnostic Software). If not, the
device will show the error
l@2.
· If you later deselect the EDM operating mode, pin 6 of the system plug must not remain
connected to 24 V. In this case, connect pin 6 to 0 V DC.
24 V or 0 V
(see Notes)
K1
k1
System plug
Pin 6 4
3
K2
k2
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