Mitsubishi Electric 800 Series Instruction Manual page 8

 Risk assessments
To ensure safety, users should conduct all risk assessments and determine residual risks for the entire machine equipment.
The company or individual who constructed the safety system must take full responsibility for installation and commissioning
of the system. To comply with the EU Machinery Directive, the system as a whole must be certified as compliant with applicable
safety standards.
Conduct all risk assessments and obtain the safety level certification for the machine or the system as a whole. It is
recommended to obtain the final safety certification by a third-party certification body.
The following shows residual risks concerning safety sub-functions of this product.
• Before shipment, check the settings of safety related parts with programming tools and on the display, and keep a record
of the setting data concerning safety related parts and the programming tools used for checking using a check sheet or
other form.
• Safety is not assured during the machine assembly or other process before completion of the installation, wiring, and
adjustment. Install, wire, and adjust the system referring to the installation guide of each unit.
• Only qualified personnel are authorized to install, start-up, repair, or adjust the system in which devices are installed. Only
properly trained engineers should install and operate the equipment.
• Separate the wiring for safety sub-functions from other signal wiring.
• Provide appropriate protections for cables (routing them in an enclosure, using a cable guard, or in other ways).
• It is recommended to use switches, relays, sensors, and other devices that comply with safety standards. When switches,
relays, sensors, and other devices are not compliant with safety standards, users must prove the safety of the devices.
• Keep the required clearance/creepage distance depending on the voltage used.
• The time before the protective function (E.SAF) is activated may differ depending on parameter settings.
• Speed monitoring functions (SLS, SSM, and SBC) are used to monitor the output frequency. These functions are not used
to monitor or guarantee the rotor speed of the motor. Set parameters so that the safe speed of the machine corresponds
to the safe speed of the motor.
• When a speed monitoring function (SLS, SSM, or SBC) is used, check that the monitored speed of the motor axis is the
same as the actual speed using a rotation speed meter or other meter, with the errors due to motor slippage taken into
account.
• For the operation using speed monitoring functions (SLS, SSM, and SBC), defects of mechanical parts such as slippage
of the shaft and coming off of the timing belt are out of the scope of guarantee. Be sure to eliminate risks of mechanical
parts in advance.
• When the speed is monitored while the SLS function is enabled, the protective function (E.SAF) is not activated for the
time period set by the parameter for the SLS speed detection delay time after a speed fault is detected. Make sure that
safety can be guaranteed during this period.
• When the safe speed monitor (SSM) function is used as a restart trigger, perform it according to IEC/EN 60204-1.
• The safe brake control (SBC) function only guarantees that power is properly supplied to the mechanical brake, and it does
not detect abrasion of the brake. The mechanic brake operation must be checked periodically.
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1. INTRODUCTION
1.1 Compliance with the EU Machinery Directive - Safety sub-functions