2.8 Risk Assessment
In order to protect personnel from any safety hazards in the machine or system, the machine/system
builder must perform a "Risk Assessment", which is often based on ISO standards. The
design/implementation of barriers, emergency stop (E-stop) mechanisms and other safeguards will be
driven by the Risk Assessment and the safety standards specified by the governing authority (for
example, ISO, OSHA, UL, etc.) for the site where the machine is being installed and operated. The
methodology and details of such an assessment are beyond the scope of this manual. However, there
are various sources of Risk Assessment information available in print and on the internet.
The following list is an example of items that would be evaluated when performing the Risk
Assessment. Additional items may be required. The safeguards must ensure the safety of all
personnel who may come in contact with or be in the vicinity of the machine.
2.8.1 Installation Risk Assessment
The safety functional requirements of a DM2020 system depend on the application and should be
considered during the evaluation of the overall risk of the installation. The designer of the installation
is responsible for the risk assessment, and the specification of requirements for levels of functional
integrity and safety integrity levels (SIL) of the drive according to CEI EN 62061: 2005 +A1:2013
+A2:2015 and/or performance levels (PL) according to UNI EN ISO 13849-1: 2016.
The following table, which is identical to Table 4 of the UNI EN ISO 13849-1: 2016, shows the
relationship between performance levels (PL) and safety integrity levels (SIL).
PL
SIL (IEC 61508-1)
operational mode
high/continuous
a No match
b 1
c 1
d 2
e 3
Because SIL 4 level refers to catastrophic events, it does not cover the risks relating to machinery.
The risk assessment presented by the machine must be carried out in accordance with Directive
2006/42 / EC, referring to UNI EN ISO 12100: 2010 and must contain the safety circuit configuration
relating to the entire machine by taking into account all components of the integrated safety system,
including the drive.
PN: L-MAM2-E-201
Moog Casella DM2020 Installation and Startup Guide
2.8 Risk Assessment
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