9
05.01
9.4 Application examples
9-369
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
EVALUATE subsystem
The EVALUATE subsystem of the supplementary EMERGENCY STOP safety
function is in this case realized using three SIRIUS 3TK3842 safety relays. The
safety relays have instantaneous and delayed enable circuits.
Safety relay –A1 is used to evaluate the EMERGENCY STOP pushbutton. De-
vices –A2 and –A3 are used to provide a safety–related time delay when swit-
ching off and are controlled from –A1 via the cascading input, terminal 1.
Table 9-17
Parameters for the EVALUATE subsystem
Parameter
Value
Comment
Safety relays 3TK2842 –A1, –A2 and –A3
PFH
d
5,4 x 10
-11
/h
Manufacturer’s data
Service life
T1 = 20 years
Manufacturer’s data
Performance Level
PLe
No differences between instantaneous
and delayed enable circuits
Result
PFH
d
1,62 x 10
-10
/h
PFH
d
= PFH
d
(–A1) +PFH
d
(–A2) + PFH
d
(–A3)
Performance Level
PLe
RESPOND subsystem
When actuating EMERGENCY STOP, the power supply of line contactor –K2 as
well as contactor relay –K1 are shutdown (de–energized) via the delayed output
(28) from –A1. When requesting EMERGENCY STOP, contactor relays –K3 and
–K4 therefore have no influence on the correct function of –K1 and –K2.
Component –K1 is tested by –A2 via –K3 at each start. Contactor –K2 is tested
by –A1 at each start.
An accumulation of faults in channel 2 between two consecutive actuations of
the EMERGENCY STOP pushbutton is not detected.
S
Basic as well as well–proven safety principles – such as the requirements
regarding Category B – are maintained. Protective circuits are provided.
Protective circuits are provided.
S
When a component fails, the safety function is always maintained.
The failure is detected.
This structure corresponds to Category 3, according to EN ISO 13849–1:2008.
9 Cabinet Design and EMC
02.12