ctrlX SAFETY "SafeMotion"
10 Commissioning
10.1 Risk assessment
Before a machine can be placed on the market, the manufacturer of the
machine must carry out a risk assessment in accordance with the Machinery
Directive 2006/42/EC in order to determine the hazards associated with the
use of the machine.
The risk assessment is a multilevel, iterative process.
The procedure is described in detail in "ISO 12100“ -
"General principles for design - Risk assessment and risk reduction". This
documentation can only give you short overview on the subject of risk assess-
ment; users of integrated safety technology are obliged to intensively study the
respective standards and legal status.
The risk assessment carried out provides you the requirements for determining
the category for safety-related control units according to the valid C-standard
the safety-relevant parts of the machine control have to comply with.
For more detailed information on the required Safety Integrity Levels (SIL),
Performance Levels (PL) and Categories, please refer to the component- and
machine-relevant standards.
Procedure
To obtain the highest possible degree of safety, the machine manufacturer
when choosing the solutions has to apply the following basic principles in the
indicated order:
●
Eliminate or minimize the hazards by design measures.
● Take the required protective measures against hazards that cannot be elimi-
nated.
● Document the remaining risks and inform the user of these risks.
Simplification by using the integrated safety technology
When using integrated safety technology, the machine manufacturer will benefit
from the following simplifications:
● The safety-related parts of the “ctrlX DRIVE" range with the "SafeMotion"
option are suited for applications up to SIL 2 (encoder-dependent safety
functions) or SIL3 (safety functions independent of an encoder) of
EN 61800-5-2.
● The safety functions integrated in ctrlX DRIVE were certified by TÜV Rhein-
land
®
; this guarantees the user that the solution complies with the state-of-
the-art / the conformity of the components in accordance with the Machi-
nery Directive 2006/42/EC is ensured.
Perform-
ance
Level (PL)
Average probability of a dangerous
failure [1/h] (PFH)
Safety integ-
rity level
(SIL)
Risk
a ≥10
-5
…<10
-4
-
b ≥3×10
-7
…<10
-6
1
c ≥10
-7
…<3×10
-6
1
d ≥10
-7
…<10
-6
2
e ≥10
-8
…<10
-7
3
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