APPENDIX
App. - 17
App. 5.2 Cautions
The following basic safety notes must be read carefully and fully in order to prevent injury to persons or
damage to property.
Only qualified personnel are authorized to install, start-up, repair or service the machines in which
these components are installed.
They must be familiar with all applicable local safety regulations and laws in which machines with these
components are installed, particularly the standards and guidelines mentioned in this Instruction
Manual and the requirements mentioned in ISO/EN ISO 13849-1, IEC 61508, IEC/EN 61800-5-2, and
IEC/EN 60204-1.
The staff responsible for this work must be given express permission from the company to perform
start-up, programming, configuration, and maintenance of the machine in accordance with the safety
standards.
Protective Measures
As described in IEC/EN 61800-5-2, the Safe Torque Off (STO) function only prevents the driver
from supplying energy to the servo motor. Therefore, if an external force acts upon the drive axis,
additional safety measures, such as locks or counter-weights must be used.
App. 5.3 Residual risk
Machine manufacturers are responsible for all risk evaluations and all associated residual risks. Below are
residual risks associated with the STO/EMG function. SMC Co. is not liable for any damages or injuries
caused by the residual risks.
(1) The SS1 function only guarantees the delay time before STO/EMG is engaged. Proper setting of this
delay time is the full responsibility of the company and/or individuals responsible for installation and
commissioning of the safety related system. The system, as a whole, must pass safety standards
certification.
(2) When the SS1 delay time is shorter than the required servo motor deceleration time, if the forced stop
function is malfunctioning, or if STO/EMG is engaged while the servo motor is still rotating; the servo
motor will stop with the dynamic brake or freewheeling.
(3) For proper installation, wiring, and adjustment, thoroughly read the manual of each individual safety
related component.
(4) Be sure that all safety related switches, relays, sensors, etc., meet the required safety standards.
(5) Safety is not assured until safety-related components of the system are completely installed or
adjusted.
(6) When replacing a driver etc. or MR-J3-D05 of Mitsubishi Electric Corporation, confirm that the new
equipment is exactly the same as those being replaced. Once installed, be sure to verify the
performance of the functions before commissioning the system.
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