6 FUNCTIONAL SAFETY
6.4 Safety sub-function
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Deceleration monitoring function
When the SS1 command is input, this function starts deceleration and monitors whether the servo motor decelerates
according to the deceleration time constant. If the deceleration set by the functional safety parameter cannot be performed,
the STO function is executed. The STO function is activated even when the time specified by [Pr. PSA03 SS1/SS2
deceleration monitor time] has elapsed since the SS1 function was activated.
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Deceleration completion monitoring
Speed monitoring will start after the SS1 command has been turned off and the time set in [Pr. PSA26 SS1/SS2 deceleration
monitor delay time] has passed.
During deceleration, when both the absolute value of the speed command and the absolute value of the speed feedback
become equal to or less than the value set in [Pr. PSA04 Safety sub-function - Stop speed], deceleration is considered to have
been completed. After the time set in [Pr. PSA15 Safety sub-function - Speed detection delay time] has elapsed, the STO
function is executed.
0 r/min
(mm/s)
OFF
ON
Servo motor speed
SS1C (SS1 command)
ON (disabled)
OFF (enabled)
SS1S (SS1 output)
ON (monitoring)
STOS (STO output)
OFF (shut-off)
Speed detection delay time
SS1/SS2 deceleration monitor time
Deceleration
Deceleration monitor delay time
STO state
Deceleration monitor
time constant
Deceleration monitor speed offset
Stop speed
Command
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