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1. FUNCTIONS AND CONFIGURATION
1.9.2 Residual risks in each function
(1) Speed monitoring (SLS)
(a) Speed monitoring function guarantees the servo motor speed, but it does not guarantee the actual
machine safety speed. Set parameters so that the safe speed of the machine is the same as the
safety speed of the specified motor.
(b) Check if the speed of the monitored servo axis is the same as the actual speed by using a
tachometer, etc. considering the speed includes an error caused by the command and encoder
resolution.
(c) The defect of the mechanical section such as slid of shaft and wanting of a timing belt, etc. is not
covered. Be sure to eliminate the risk of mechanical section before operation.
(d) Speed monitoring error detection time is set to 1 ms. Error in shorter than this time is not detected.
(e) After speed is over the limit, safety observation error (shut-off signal off) does not occur during the
speed error detection time set by the parameter. Make sure that safety can be ensured during this
period.
(2) Safe speed monitor (SSM)
When SSM is used as a restart trigger, perform it according to IEC 60204-1.
(3) Safe brake control (SBC)
This function guarantees only that power to mechanic break is properly supplied and abrasion of the
brake cannot be detected. Check this function regularly that the mechanic brake can operate.
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