Chapter 17 Safe Torque Off Function
MS300
(High Speed Model)
17-5
17-4 Failure Rate of the Drive Safety Function
Please refer to Table 3 below for
relevant
safe parameters of safe loop:
Item
Definition
Standard
Performance
SFF Safe
failure
fraction
IEC61508
S1-DCM = 88.35 %
S2-DCM = 88.2 %
HFT (Type A
subsystem)
Hardware fault tolerance
IEC61508
1
SIL
Safety integrity level
IEC61508 SIL
2
IEC62061 SILCL
2
PFH
Average frequency of
dangerous failure [h-1]
IEC61508
1.36 x 10
-9
PFD
av
Probability of dangerous failure
on demand
IEC61508
5.99 x 10
-6
PTI
Proof test interval
IEC61508
1 year
Category Category
ISO13849-1 Category
3
PL Performance
level
ISO13849-1 d
MTTF
d
Mean time to dangerous failure
ISO13849-1 High
DC Diagnostic
coverage ISO13849-1 Low
Table 3: Relevant safe parameters of safe loop
17-5 Reset the Parameter Settings
Pr. 06-44 can be used to set the reset method when an STO alarm occurs.
STO Latch Selection
Factory setting: 0
Settings 0: STO Alarm Latch
1: STO Alarm no Latch
Pr. 06-44 = 0 STO Alarm Latch: after the reason of STO Alarm is cleared, a Reset command is
needed to clear STO Alarm.
Pr. 06-44 = 1 STO Alarm no Latch: after the reason of STO Alarm is cleared, the STO Alarm will
be cleared automatically.
All of STL1~STL3 error are “Alarm latch” mode (in STL1~STL3 mode, the Pr. 06-44 function is
not effective).
Содержание VFD11AMS21AFSHA
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