External Device Monitoring (Edm); Fig. 17: Connection Of The Contact Elements To The Edm - SICK L 4000 Manual De Instrucciones

Chapter 5
Fig. 17: Connection of the
contact elements to the
EDM
Notes
306
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Electrical installation
5.2

External device monitoring (EDM)

The EDM checks if the contactors (or other switching devices) actu-
ally de-energise when the protective device responds. If, after an at-
tempted reset, the EDM does not detect a response from the
switched device within 420 ms, the EDM will deactivate the OSSD
switching outputs again.
1 2 3 4
9 10 11 12
OSSD ON
OSSD OFF
RESET
STATUS
UE 401
13 14 15 16
5 6 7 8
You must implement the EDM electrically by the positive closing ac-
tion of both N/C contacts (k1, k2) when the contact elements (K1,
K2) reach their de-energised position due to the interruption of the
light path. 24 V is then applied at the input of the EDM. If 24 V is not
applied after a light path interruption, one of the contact elements is
defective and the EDM prevents the machine restart. The EDM func-
tion is active in the status as delivered.
The EDM remains active after switching the device off and back on
again.
To deactivate the EDM, connect pin 3 and 10 on the safety evalua-
tion device UE 401 to 24 V.
EDM
OSSD 1
OSSD 2
K1
K2
DC 24 V
Operating Instructions
L 4000 system
1
k1
2
k2
8010009/TI69/2009-11-26