
SD700FL SERIES
POWER ELECTRONICS
64
CONTROL CONNECTION
Example 2: SIL3 (PLe) Safety door opening stop for maintenance tasks with manual
restart
. This function is used to prevent an unexpected restart when a maintenance task is being
carried out in a risk area. In this case, the relay‟s safety inputs will be connected to a safety
interlock switch placed in the door. Additionally a push button is installed to force a manual restart
of the safety relay and a lamp connected to the NC output contact of the external safety relay will
indicate the restart.
Figure 7.10 Example 2- Safety door opening
CAUTION
For SIL 3 applications the safety function has to be tested regularly (approximately once per
month) in order to detect certain failures.
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