Danfoss VLT FC 280 Operating Manual page 96

VLT® Midi Drive FC 280
Operating Guide
Probability of dangerous failure on demand (PFD
Probability of dangerous failure per hour (PFH)
Safe failure fraction (SFF)
Hardware fault tolerance (HFT)
Proof test interval (PTI)
Common cause failure (CCF)
Diagnostic test interval (DTI)
Systematic capability
STO reaction time Input to output response time
PFD is not suitable for the drive due to the fact that it is assumed to be working in continuous mode in IEC 61800-5-2. Here, PFD
1
avg
ence purposes only.
9
1 FIT=1/(10 hour).
2
For proof test procedure, refer to chapter Operation and Maintenance.
3
STO reaction time via digital input is the amount of time from an input signal condition triggers the STO until the torque is removed from the
4
motor interface.
Table 46: Safety Functions via Safety Fieldbus
Safety standards
Safety functions
Safety performance
96 | Danfoss A/S © 2022.02
(3)
E/E/PE
Machinery system
E/E/PE in machinery system
Drive
Safety fieldbus
STO
SS1-t
ISO 13849-1
Category
Diagnostic coverage (DC)
Mean time to dangerous failure (MTTF
Performance level
IEC 61508/IEC 61800-5-2/IEC 62061
Safety Integrity Level
SIL Claim Limit (SIL CL)
Probability of dangerous failure per hour (PFH)
Safe failure fraction (SFF)
)
(1)
avg
(4)
)
D
Safety Functions
-4
2.5x10
9.0 FIT
(2)
For dual-channel parts: >93%
For single-channel parts: >99%
For dual-channel parts: HFT=1
For single-channel parts: HFT=0
20 years
β=5%; β =2%
D
<10 minutes
SC 3
≤110 ms
avg
IEC 61508
ISO 13849-1
IEC 62061
IEC 61800-5-2
IEC 61784-3-3
IEC 61800-5-2
Cat.3
90%<DC <99% (medium)
avg
350 years (high)
PL e
SIL3
9.0 FIT
(1)
For dual-channel parts: >93%
AQ381425076031en-000101 / 130R1223
is for refer-