5.11.5 Precautions for Safety Functions
WARNING
• To check that the HWBB function satisfies the safety requirements of the system, be sure to conduct a risk
assessment of the system.
Incorrect use of the machine may cause injury.
• The motor rotates if there is external force (e.g., gravity in a vertical axis) when the HWBB function is oper-
ating. Therefore, use an appropriate device independently, such as a mechanical brake, that satisfies
safety requirements.
Incorrect use of the machine may cause injury.
• While the HWBB function is operating, the motor may rotate within an electric angle of 180° or less as a
result of a SERVOPACK failure. Use the HWBB function for applications only after checking that the rota-
tion of the motor will not result in a dangerous condition.
Incorrect use of the machine may cause injury.
• The dynamic brake and the brake signal are not related to safety functions. Be sure to design the system
that these failures will not cause a dangerous condition when the HWBB function operates.
Incorrect use of the machine may cause injury.
• Connect devices meeting safety standards for the signals for safety functions.
Incorrect use of the machine may cause injury.
• If the HWBB function is used for an emergency stop, turn OFF the power supply to the motor with indepen-
dent electric or mechanical parts.
Incorrect use of the machine may cause injury.
• The HWBB function does not turn OFF the power supply to the servo drive or electrically insulate the
servo drive. When maintaining the servo drive, be sure to turn OFF the power supply to the servo drive
independently.
Failure to observe this warning may cause an electric shock.
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