12.2010 Configuration and Connection Examples
Siemens AG 6SE7087-6QX70 (Version AM)
SIMOVERT MASTERDRIVES Compendium Motion Control 2-39
♦ Determination of diagnostic coverage
Parameter Value Comment
DC(channel1) 99 %
Testing of –K1 via –K3 in feedback circuit of
–A2 every time the protective door is closed
DC(channel2) 90 %
Testing of –K2 and –K3 in feedback circuit of
–A1 on request for Emergency Stop (12x per year)
Faults might accumulate undiscovered between
the requests.
DC
avg
94.5 % → average
)2channel( MTTF
1
)1channel( MTTF
1
)2channel(MTTF
DC
)1channel(MTTF
DC
DC
dd
d
2
d
1
avg
+
+
=
♦ Determination of Performance Level
• Structure of SRP/CS according to Category 3
• MTTF
d
is high
• DC
avg
is average
• Sufficient measures against common cause failure
According to EN ISO 13849-1:2008 Appendix K, PL e is achieved
with PFHd = 4.29 x 10
-8
/ h.
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