Confirming Safety Functions; Precautions For Safety Functions - YASKAWA JUSP-MD D01A Series User Manual

5 Operation

5.11.4 Confirming Safety Functions

(3) Procedure

5.11.4 Confirming Safety Functions

When starting the equipment or replacing the SERVOPACK or converter for maintenance, be sure to conduct
the following confirmation test on the HWBB function after wiring.
• When the /HWBB1 and /HWBB2 signals turn OFF, check that the panel operator or digital operator dis-
plays "Hbb" and that the servomotor does not operate.
• Check the ON/OFF states of the /HWBB1 and /HWBB2 signals with Un015.
→ If the ON/OFF states of the signals do not coincide with the display, an error in the external device, dis-
connection or short-circuiting of the external wiring, or a failure in the SERVOPACK or converter must be
considered. Find the cause and correct the problem. For details, refer to 8.7 Monitor Display at Power ON.
• Check with the display of the feedback circuit input of the connected device to confirm that the EDM1 sig-
nal is OFF while in normal operation.

5.11.5 Precautions for Safety Functions

• 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.
• 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.
5-86
Request to open the guard.
1
When the servomotor is operating, the host
controller stops the servomotor and turns
2
OFF the Servo ON signal (/S-ON).
3
Open the guard and enter.
The /HWBB1 and /HWBB2 signals are
4
OFF and HWBB function operates.
(The operation in the guard is available.)
After completing the operation, leave and
5
close the guard.
Turn ON the /S-ON signal from the host con-
6
troller.
WARNING