schmersal PSC1 Series Installation Manual page 165

Installation manual
Channel B – shutdown via STO/converter:
Component MTTFD [years]
Door locking B10d = 100000
Nop = 30/AT = 9270/year (309 AT/year)???
MTTFD =
SIN/COS MTTFD_SinCos = 30 years
encoder
PES PFH = 1.4 * 10
MTTFD =
STO/converter MTTFD_STO = 150 years
MTTFD_A =
1
MTTFD_Türz
= 20.25  20 years
Resulting PL for both channels:
Symmetrisation of
MTTFD =
both channels:
DC average value
MTTFD =
98%MTTFD =
= 0.9776  98%
98%MTTFD =
98%MTTFD =
98%
PL MTTFD = 21.5 years = medium
DC avg = 98% = medium
PL ="d" (from EN ISO 13849-1, Tables 5, 6 and 7)
In this case the B10d value for the door monitoring is definitive for the PL. If
a higher safety level is to be achieved, a correspondingly higher quality
switch is to be used.
HB-37350-810-01-38F-DE PSC1-C-10 Installation manual V1.1.docx
Version: 38F
B10d
= 100 Jahre
9270 years
0,1∗Nop
-8
1
= 8115 = 1 k Jahre
8760∗ MTTFD
1
1 1
+ + +
MTTFD_SinCos MTTFD_PES MTTFD_Netzsch
2
[MTTFD_A + MTTFD_B −
3
DCSwitch DCSinCos
+
MTTFD_Türz MTTFD_SinCos
1
MTTFD_Türz
DCSwitch
MTTFD_Türz
MTTFD_Türz
DCSwitch
MTTFD_Türz
MTTFD_Türz
DCSwitch
MTTFD_Türz
MTTFD_Türz
DC
DCSwitch = 99%
DCEncoder = 99%
DCPES = 99%
107.87  108 years
DCPES = 90%
= 20 Jahre
1
1
1
+
MTTFD_A
DCPES DCSchütz
+ +
MTTFD_PES MTTFD_Schütz
1 1
+ + +
MTTFD_SinCos MTTFD_PES MTTFD_Netzsch
DCSinCos DCPES
+ + +
MTTFD_SinCos MTTFD_PES MTTFD_Schütz
1 1 1
+ +
MTTFD_SinCos MTTFD_PES
DCSinCos DCPES
+ + +
MTTFD_SinCos MTTFD_PES MTTFD_Schütz
1 1 1
+ +
MTTFD_SinCos MTTFD_PES
DCSinCos DCPES
+ + +
MTTFD_SinCos MTTFD_PES MTTFD_Schütz
1 1 1
+ +
MTTFD_SinCos MTTFD_PES
] = 27 Jahre
21.53  21.5 years
1
MTTFD_B
DCSTO
+
MTTFD_STO
=
1
DCSchütz DCSTO
+
MTTFD_STO
=
1
+
MTTFD_Netzsch
DCSchütz DCSTO
+
MTTFD_STO
=
1
+
MTTFD_Netzsch
DCSchütz DCSTO
+
MTTFD_STO
=
1
+
MTTFD_Netzsch
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