SMC Networks LECYU Series, Operation Manual

Page: 163 / 250

4 Operation
4- 64
4.9.6 Precautions for Safety Function
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 a DRIVER failure. Use the HWBB function for applications only after checking 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 lock 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 DRIVER or electrically isolate it. Take
measures to shut off the power to the DRIVER when performing maintenance on it.
Failure to observe this warning may cause an electric shock.