Configuration and Connection Examples
12.2010
6SE7087-6QX70 (Version AM) Siemens AG
2-32
Compendium Motion Control
SIMOVERT MASTERDRIVES
2.4.5.3
Check of the PFH value of the safety function as a whole
Parameter
PFH value
PL
Comment
ACQUIRE 4.29
x
10
-8
/ h
e
Emergency Stop button –S3
EVALUATE
9.4 x 10
-10
/ h
e
Safety switching device –A1
REACT
4.29 x 10
-8
/ h
e
Switching elements –K1 and
-K2
Total
8.67 x 10
-8
/ h
e
< 1x10
-6
/ h
The requirements regarding PL d with Category 3 for the
supplementary safety function Emergency Stop are thus fulfilled.
2.4.6
Emergency Stop and protective door monitoring on a converter
→
STO
a) The drive is switched off safely when the protective door is opened.
b) The drive must be switched off safely by the supplementary safety
function Emergency Stop.
As a result of the risk assessment, the required performance level for
both safety functions has been defined as PLr = d.
The DC link must remain energized in normal operation when the
protective door is open.
Requirement
