Functional safety
326
9.
FUNCTIONAL SAFETY
Technical data of the safety function
320
DDS
HARDWARE
Ref.1310
9.6 Technical data of the safety function
Fagor Automation drives AXD/SPD only offer the safety function STO
(
Safe Torque Off) defined according to the standard IEC 61800-5-2.
To calculate the
Performance Level (PL of ISO 13849-1) and/or the Safe-
ty
Integrated Level (SIL of IEC 62061) use the following data referred to
AXD/SPD drives given in the following tables:
This data is calculated considering a contactor with 500,000 life cycles
and a demand from the STO safety function every 5 minutes running 24
hours a day. For higher demands, check with Fagor Automation.
Note. Bear in mind that PFH and MTTFd are calculated values and show
the probability of failure. This does not guarantee the useful life of a par-
ticular product.
The external main contactor - KM1 installed must comply with standard
IEC 60947-4-1 (if it is a mirror-contact type) or with IEC 60947-5-1 (if its
contact is joined mechanically).
The Drive Enable has been designed to be used in high-demand mode
(more than once a year) according to standard IEC 61800-5-2.
T. H9/1 Calculation data according to IEC 61508 and IEC 61800-5-2.
Lifetime years 20
SFF (Safe Failure Fraction) % 99
PFH (Average frequency of a dangerous
Failure per Hour)
1/h 1.5654E-07
HFT (
Hardware Fault Tolerance) 1
SIL (
Safety Integrity Level) 2
T. H9/2 Calculation data according to ISO 13849-1.
PL (
Performance Level) d
MTTFd (
Mean Time To dangerous Failure) years 21.4
DC (
Diagnostic Coverage) % 98
Category 3
CCF (
Common Cause Failure) 80
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