Yaskawa Sigma-5 Large Capacity Users Manual: Design and Maintenance-Rotary Motors-Analog Voltage and Pulse Train Reference - Manual (Page 211)

5 Operation
5.11.5 Precautions for Safety Functions
5-90
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 servomotor rotates if there is external force (e.g., gravity in a vertical axis) when the HWBB function is
operating. 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 failure of the SERVOPACK or converter. Use the HWBB function for applications only after check-
ing that the rotation 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 safety-related parts of a control system. 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 servomotor with
independent electric or mechanical parts.
Incorrect use of the machine may cause injury.
• The HWBB function does not shut off the power to the SERVOPACK and converter or electrically isolate it.
Take measures to shut off the power to the SERVOPACK and converter when performing maintenance on
it.
Failure to observe this warning may cause an electric shock.