Risk Assessment - Mitsubishi Electric MELSEC Q Series Programming Manual

1 OVERVIEW

1.4 Risk Assessment

Define all risk assessments and residual risks for the whole machine to ensure safety.
The company and/or individuals who constructed the system take responsibility for
everything in terms of safety system installation and commission. In addition, to
correspond to EC Machinery Directive, the safety standard needs to be certified as the
whole system.
Execute all risk assessment and safe level verification for the equipment and the whole
system. It is recommended to use third-party certifier as a final certifier of the system.
The residual risk in safety observation function of this product is shown below.
• This function does not detect errors among the parameters and programs that are set
by you. Therefore, safety of machines cannot be secured unless the safety operation
test is performed on the machines.
• At the shipment to end-users, confirm the safety related setting by monitoring status
and displayed details of the programming tools and displays. Also, record and save
the setting data of safety-related information and programming tools by using check
sheet, etc.
• Safety cannot be secured unless assembling, installation, wiring and adjustment of
the machine are completed. For the installation, wiring and adjustment, follow the
instructions in the user's manual of each module.
• Only qualified personnel are authorized to install, start-up, repair or service the
machines in which components are installed. Only trained engineers should install
and operate the equipment. (EN ISO 13849-1:2015 (Cat 3 PL d) Table F.1 No.5)
• Separate the wiring for safety observation function from other signal wirings.
(EN ISO 13849-1:2015 (Cat 3 PL d) Table F.1 No.1)
• Protect the cables with appropriate ways (routing them in a cabinet, using a cable
guard, etc.)
• To use the switch, relay and sensor which complies with the safety standards is
recommended. In case of using the switch, relay and sensor which does not comply
with the safety standard, please apply them for the certifications.
• Keep the required clearance/creepage distance depending on voltage.
• Time to detect the safety observation error depend on the process cycle of safety
observation of each CPU.
The residual risk in each function of safety observation function is shown below.
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