STO
–
Safe Torque OFF
Technical data
Operating Manual Rev. 1.3
www.engelantriebe.de
page 16
7.2
Safety parameters
Designation
Unit
Standard
Additional information
62061
61508
13849
HFT
1
1
Hardware fault tolerance
PFH
1/h
4.73 ∙ 10
-11
9.12 ∙ 10
-11
Probability of dangerous failure
per hour
PFD
1.04 ∙ 10
-7
7.89 ∙ 10
-6
Probability of dangerous failure
on demand
SFF
%
99.92
99.92
Safe failure fraction
(Percentage of failures that do
not affect the safety function)
SIL (SC)
3
3
Safety integrity level
DCavg
%
0.00
Average diagnostic coverage
MTTFd
years
25974
Mean time to dangerous failure
PL
e
Performance level
Cat
3
Category
7.3
Certification
Designation
Type examination
The functional safety technology of the product has been tested and certified as a
safety component to Annex IV of the European Machinery Directive 2006/42/EG.
Safety function „Safe Torque Off‟ (STO) according to DIN EN 61800
-5-2 2017
Safety of machinery.
Certificate-issuing authority
TÜV Rheinland Industrie Service GmbH, Köln
7.4
Maintenance
The integrated drives from ENGEL Elektroantriebe GmbH do not require any special maintenance measures. A defective
drive must be completely replaced. Repairs are not permitted.
