Operating Instructions
Chapter
5
miniTwin2
8013482/YT85/2016-02-23
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
49
Subject to change without notice
Electrical installation
5.5
External device monitoring (EDM)
The EDM checks if the contactors actually de-energize when the protective device
responds. If, after an attempted switch-off, the EDM does not detect a response from the
switched device within 300 ms, the EDM will deactivate the OSSDs again.
You must implement the external device monitoring electrically by the positively guided
closing action of both N/C contacts (k1, k2) when the contact elements (K1, K2) reach
their de-energized position after the protective device has responded. 24 V is then applied
at the input of the EDM. If 24 V is not present after the response of the protective device,
then one of the contact elements is faulty and the external device monitoring prevents the
machine starting up again.
If you connect contacts to be monitored to the external device monitoring input (EDM),
then EDM is configured automatically during commissioning (see section 6.6
“Configuration of the external device monitoring (EDM)” on page 56).
You must connect the contacts to be monitored
together
on the external device
monitoring input (EDM)
on a
miniTwin2.
Fig. 39: Connecting the
contact elements to the EDM
Notes
Pin 4
Pin 2
k1
k2
K2
K1
Pin 4
0 V DC
Pin 2
24 V DC
