Siemens Simovert Masterdrives Compendium page 59

12.2010
Parameter
DC(channel1)
DC(channel2)
DC
avg
2.4.5.2 Measures against common cause failure (CCF) of the safety function
Siemens AG 6SE7087-6QX70 (Version AM)
SIMOVERT MASTERDRIVES
♦ Determination of diagnostic coverage
Value
90 %
90 %
90 % → average
♦ Determination of Performance Level
•
Structure of SRP/CS according to Category 3
•
MTTF is high
d
•
DC is average
avg
• Sufficient measures against common cause failure
According to EN ISO 13849-1:2008 Appendix K, PL e is achieved with
-8
PFHd = 4.29 x 10 / h.
In accordance with ISO 13849-1 Appendix F, a minimum of 65 points
are required for SRP/CS from Category 2.
Measure
Physical separation between signal paths:
Separation of wiring in control cabinet
Adequate creepages and clearances on printed circuits.
Protection against overvoltage, overcurrent
Use of proven components.
Diverse technologies are applied as a result of the internal
structure of the elements for Evaluate and React
The requirements regarding resistance to all relevant
ambient conditions such as temperature, shock, vibration,
humidity (e.g. as specified in the applicable standards) taken
into consideration.
The designers have been trained to detect the reasons for
and effects of common cause failures.
Total
A sufficient total of 65 points is achieved.
Compendium Motion Control
Configuration and Connection Examples
Comment
Testing of -K1 in feedback circuit of –A1
Testing of -K2 in feedback circuit of –A1
= =
DC DC (channel 1)
avg
DC (channel 2)
Points
15
15
5
20
10
5
70
2-31