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6 FUNCTIONAL SAFETY
6.4 Safety sub-function
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Deceleration monitoring
When [Pr. PSA02.2 Time/Deceleration monitor setting] is set to "1", speed monitoring can be performed.
After the SS2 command is turned off and the time set in [Pr. PSA26 SS1/SS2 deceleration monitor delay time] has elapsed,
speed monitoring starts. This function monitors whether the servo motor does not exceed the speed specified by [Pr. PSA24
SS1/SS2 deceleration monitor time constant] from the speed at the moment that the SS2 command is turned off.
When the servo motor speed is exceeded, the STO function is activated. For the threshold used for judgment, the offset can
be set in [Pr. PSA25 SS1/SS2 deceleration monitor speed offset].
0 r/min
OFF
Servo motor speed
SS2C (SS2 command)
ON (disabled)
OFF (enabled)
SOS (SOS output)
ON (monitoring)
Speed detection delay time
SS1/SS2 deceleration monitor time
Deceleration
Deceleration monitor delay time
Stop monitoring (SOS)
Deceleration monitor time constant
Deceleration monitor speed offset
Stop speed
Command
Feedback
0 r/min
OFF
ON
Servo motor speed
SS2C (SS2 command)
ON (disabled)
OFF (enabled)
SOSS (SOS 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
Feedback