Danfoss VLT FC 280 Operating Manual page 102

Operating Guide | VLT® Midi Drive FC 280
Table 46: Safety Functions via Safety Fieldbus
Safety standards E/E/PE
Machinery system
Drive
Safety fieldbus
Safety functions STO
SS1-t
Safety performance ISO 13849-1
Category
Diagnostic coverage (DC)
Mean time to dangerous failure (MTTF
Performance level
IEC 61508/IEC 61800-5-2
Safety Integrity Level
SIL Claim Limit (SIL CL)
Probability of dangerous failure per hour (PFH)
Probability of dangerous failure on demand (PFD
Safe failure fraction (SFF)
Hardware fault tolerance (HFT)
Failure rates of 1oo1 part
Failure rates of 1oo2 part
Proof test interval (PTI)
Mission time
Common cause failure (CCF)
Diagnostic test interval (DTI)
Systematic capability
Operation mode
102 | Danfoss A/S © 2024.10
IEC 61508
ISO 13849-1
IEC 61800-5-2
IEC 61784-3-3
IEC 61800-5-2
Cat.3
90%<DC
) 350 years (high)
D
PL e
SIL3
(1)
9.0 FIT
-4
) 2.5x10
avg
For dual-channel parts: >93%
For single-channel parts: >99%
For dual-channel parts: HFT=1
For single-channel parts: HFT=0
λ
=9.3x10
S
λ
=2.0x10
D
λ
=1.9x10
DD
λ
=1.3x10
DU
λ
=4.6x10
S
λ
=3.1x10
D
λ
=2.9x10
DD
λ
=2.4x10
DU
20 years
20 years
β=5%; β
D
<10 minutes
SC 3
Low/High/Continuous demand mode
Safety Functions
<99% (medium)
avg
-7
-8
-8
-9
-7
-7
-7
-8
=2%
AQ381425076031en-000201 / 130R1223