6-5
Safe Torque Off
AC30V series Variable Speed Drive
Safety Specification
As assessed to EN ISO13849-1 and EN61800-5-2 the AC30V has the following related safety values:-
Criterion
Requirement
Value achieved
SIL3
For type A subsystems, HFT = 1:
SFF ≥ 60%
SFF = 99%
SIL3
10
-7
≥ PFH ≥ 10
-8
PFH = 2.3 x 10
-9
SIL Capability
-
3
PLe
Category 3; PFH ≤ 4,29 x 10
-8
PFH = 2.3 x 10
-9
PLe
30 years ≤ MTTFd < 100 years
MTTFd = 100 years
1
PLe
DC = medium
DC = Medium
Mission Time
20 years
20 years
Fault Reaction Function
-
Latched STO
2
1
EN ISO13849 limits MTTFd to 100 years.
2
A detected fault in the STO circuit causes STO to become active, and remain active until after a power cycle.
