YASKAWA SERVOPACK Sigma 7W Series Product Manual

Contents

5.2 HWBB Function5.2.10 /BK (Brake Output) Signal5-115 Safety Functions5.2.10 /BK (Brake Output) SignalIf the HWBB function operates when the /HWBB1 or /HWBB2 signal is OFF, the /BK (Brake)signal will turn OFF. At that time, the setting in Pn506 (Brake Reference - Servo OFF DelayTime) will be disabled. Therefore, the Servomotor may be moved by external force until theactual brake becomes effective after the /BK signal turns OFF.5.2.11 Stopping MethodsIf the /HWBB1 or /HWBB2 signal turns OFF and the HWBB function operates, the Servomotorwill stop according to the stop mode that is set for stopping the Servomotor when the servoturns OFF (Pn001 = n.X). However, if the dynamic brake is enabled (Pn001 = n.0 orn.1), observe the following precautions.5.2.12 ALM (Servo Alarm) SignalThe ALM (Servo Alarm) signal is not output in the HWBB state.CAUTION The brake signal is not a safety-related element. You must design the system so that a haz-ardous condition does not occur even if the brake signal fails in the HWBB state. Also, if aServomotor with a Brake is used, keep in mind that the brake in the Servomotor is used onlyto prevent the moving part from being moved by gravity or an external force and it cannotbe used to stop the Servomotor.CAUTION The dynamic brake is not a safety-related element. You must design the system so that ahazardous condition does not occur even if the Servomotor coasts to a stop in the HWBBstate. Normally, we recommend that you use a sequence that returns to the HWBB stateafter stopping for a reference. If the application frequently uses the HWBB function, stopping with the dynamic brake mayresult in the deterioration of elements in the SERVOPACK. To prevent internal elements fromdeteriorating, use a sequence in which the HWBB state is returned to after the Servomotorhas come to a stop.