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9 Cabinet Design and EMC
9.4 Application examples
9.4.2
EMERGENCY STOP and protective door monitoring at a conver-
ter → SS1
Requirement
9-360
Checking the PFH value of the complete safety func-
tion
Table 9-10
PFH value of the complete safety function
Parameter
PFH value
SENSE
4,29 x 10
EVALUATE
2,7 x 10
RESPOND
4,29 x 10
Total
8,85 x 10
As a consequence, the requirements regarding PLd with Category 3 for the sup-
plementary EMERGENCY STOP safety function are fulfilled.
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.
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
PL
-8
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e
EMERGENCY STOP pushbutton –S3
-9
/ h
e
Safety relay –A1
-8
/ h
e
Switching elements –K1 and –K2
-8
-6
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e
<1 x 10
© Siemens AG 2012 All Rights Reserved
02.12
05.01
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/ h
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