9
05.01
9.4 Application examples
9-360
©
Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Checking the PFH value of the complete safety func-
tion
Table 9-10
PFH value of the complete safety function
Parameter
PFH value
PL
Comment
SENSE
4,29 x 10
-8
/ h
e
EMERGENCY STOP pushbutton –S3
EVALUATE
2,7 x 10
-9
/ h
e
Safety relay –A1
RESPOND
4,29 x 10
-8
/ h
e
Switching elements –K1 and –K2
Total
8,85 x 10
-8
/ h
e
<1 x 10
-6
/ h
As a consequence, the requirements regarding PLd with Category 3 for the sup-
plementary EMERGENCY STOP safety function are fulfilled.
9.4.2
EMERGENCY STOP and protective door monitoring at a conver-
ter
→
SS1
a) Opening the protective door stops the drive in a controlled fashion.
After the stopping time has expired, the drive is safely switched into a
no–torque condition.
b) The supplementary safety function Emergency Stop results in the drive being
safely stopped in a controlled fashion. After the stopping time has expired,
the drive is safely switched into a no–torque condition
As a result of the risk assessment, the required Performance Level for both sa-
fety functions is defined to be PLr = d.
When the protective door is open, in normal operation, the DC link voltage
should be kept.
Requirement
9 Cabinet Design and EMC
02.12