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2 Engineering
2.8 Safe Torque Off (STO)
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Rapid Link 5 · RAMO5 · RASP5 05/20 MN034004EN www.eaton.com
2.8.11 Application of the STO function and safety parameters
The STO function is approved for use as a fail-safe method even in cases in
which the STO signal is not present and a single fault has occurred in the
drive.
The drive was accordingly tested in accordance with the following safety
standards:
The values specified here can only be adhered to if the STO function is
requested at least once every three months and if the RASP5 speed control-
ler is installed in an environment whose values meet the permissible limits:
• Ambient temperature range: -10 to +50 °C, taking into account any limits
that depend on frame size and degree of protection.
• Maximum installation height for rated operation: 1000 m above mean
sea level
with a power reduction of 1 % per 100 m above 1000 m (up to max.
4000 m IEC/max. 2000 m UL).
• Relative humidity: < 95 % (non-condensing).
The RASP5 speed controller must always be free of frost and moisture.
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DANGER
In certain applications, additional measuring and monitoring
equipment may be needed in order to meet the requirements of
the system’s safety function.
The STO function does not include a motor brake and the
RASP5 braking function cannot be considered a fail-safe method
by itself.
If a motor braking function is required, an appropriate safety
relay and/or a mechanical braking system or a similar method
must be used.
EN ISO 13849-1 PL e Cat. 3 MTTF
d
: 10000 years (High) DC
avg
: 91 %
(Medium)
IEC61508 SIL 3 PFH
d
: 1.5 x 10
-10
1/h
(1.5 % of SIL 3)
(High demand or continuous
mode)
PFD
avg
(T1 = 20 years): 1.6 x 10
-5
(0.2 % of SIL 3)
(Low demand mode)
IEC62061 SIL CL 3
IEC61800-5-2 SIL 3
Cat. = Category
DC
avg
= Average Diagnostic Coverage
MTTF
d
= Mean time to dangerous failure
PFH
d
= Probability of dangerous failure per hour
PFD
avg
= Average probability of dangerous failure on demand
PL = Performance level
SIL = Safety Integrity Level
SIL CL = Safety integrity level claim limit