ctrlX SAFETY "SafeMotion"
Safety characteristics of the safety system
Depending on the axis safety functions used and the device range used, there
are the following safety characteristics:
Designation ctrlX DRIVEplus
PFH
M5 option (no SBC function)
1),
2)
1×10
-9
1/h
PFH
SBC function, brake 1
1), 2)
1×10
-9
1/h
PFH
EC option
/ PFH
EnDat
1), 2)
2×10
-9
1/h
Mission Time 175,200 h (20 years)
MTTF
d/channel
1)
> 90 years
DC
avg
> 95 %
Legend:
1):
The specified safety characteristics refer to an average ambient tempera-
ture of 40 °C (see also Ambient and operating conditions in the Project Plan-
ning Manuals).
2):
PFH value of an axis with SafeMotion, additional components not taken into
account (e.g., encoder, brake, safety control). For determining the actual PFH
value, see
⮫ Calculating the PFH component of an axis
.
"Mission Time" and "Proof Test” interval
−
The "Mission Time" of all components used has to be observed and com-
plied with. After the "Mission Time" of a component has elapsed, the com-
ponent has to be discarded or replaced. It is not allowed to continue oper-
ating the component!
The drive system ctrlX DRIVE does not monitor or log the "Mission Time".
−
After the component was discarded ("Mission Time" has elapsed), it has to
be ensured that the component cannot be reused (e.g., by disabling it).
− If a component (with valid "Mission Time") is decommissioned, the "Mis-
sion Time" has to be recorded and continued when the component is com-
missioned again.
− The "Proof Test" has not been specified for ctrlX DRIVEplus. Therefore, the
"Mission Time" cannot be reset by a "Proof Test".
6.4.3
Calculating the PFH component of an axis
To determine the required total PFH value of an axis, the PFH values of the
individual components relevant to the safety function and of the required third-
party components have to be used for calculation. The figure below illustrates
all the components relevant to the calculation:
Fig. 3: SafeMotion: Determining the PFH for an axis
1)
Third-party component
To calculate the PFH value of an axis, a valid PFH value has to be available for
all components which have an influence on the safety function (if necessary,
procure the PFH value from the component manufacturer).
Table 6: SafeMotion: Formula to calculate PFH for an axis
PFH
axis
= PFH
M5 option
+ PFH
EC option
+ PFH
encoder
+ PFH
SBC function, brake 1
+ PFH
brake 1
To Next Page
Loading...
