SEW-Eurodrive CMP40 - 112, Руководство по эксплуатации, Страница: 25 / 32

9 Technical data
Characteristic safety values
Addendum to the Operating Instructions – Synchronous Servomotors CMP40 – 112, CMPZ71 – 100
25
9.2 Characteristic safety values
9.2.1 Characteristic safety values for AK0H encoders
The following table shows the characteristic safety values of the safety-rated encoders
AK0H, in regard of the Sin/Cos signals.
Characteristic values according to
EN 62061/IEC 61508 EN ISO 13849-1
Safety class/underlying standards
SIL2 PL d
Structure HFT = 1 2-channel (corresponds to cat-
egory 3)
Probability of a dangerous failure per
hour (PFH
d
value)
1)
1.3 × 10
-8
1/h
Mean time to dangerous failure
(MTTF
d
value)
– 100 years
Mission time/service life 20 years
Proof test interval Not required –
Safe fault coverage (SSF)
> 90% –
Motor/encoder connection In a drive with FS logo on the nameplate: Fault exclusion according
to EN ISO 13849-1.
1) The specified value refers to a diagnostic coverage of 90%, that must be achieved by an encoder evaluation unit. Diagnostics must
be performed within the process response time. For corresponding error presumptions, refer to the EN 61800-5-2 standard. The en-
coder evaluation unit must at least meet the requirements for SIL 2.
9.2.2 Characteristic safety values for AK1H encoders
The following table shows the characteristic safety values of the safety-rated encoders
AK1H, in regard of the Sin/Cos signals.
Characteristic values according to
EN 62061/IEC 61508 EN ISO 13849-1
Safety class/underlying standards SIL2 PL d
Structure
HFT = 1 2-channel (corresponds to cat-
egory 3)
Probability of a dangerous failure per
hour (PFH
d
value)
1)
1.0 × 10
-8
1/h
Mean time to dangerous failure
(MTTF
d
value)
– 1073 years
Mission time/service life
20 years
Proof test interval Not required -
Safe fault coverage (SSF) > 90% -
Motor/encoder connection
In a drive with FS logo on the nameplate: Fault exclusion according
to EN ISO 13849-1.
1) The specified value refers to a diagnostic coverage of 90%, that must be achieved by an encoder evaluation unit. Diagnostics must
be performed within the process response time. For corresponding error presumptions, refer to the EN 61800-5-2 standard. The en-
coder evaluation unit must at least meet the requirements for SIL 2.
22491465/EN – 03/2016