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6 FUNCTIONAL SAFETY
6.4 Safety sub-function
■
Deceleration speed excess monitoring
This function monitors whether the servo motor does not exceed the observation speed specified by [Pr. PSA24 SS1/SS2
deceleration monitor time constant] when the motor decelerates from the speed where [Pr. PSA25 SS1/SS2 deceleration
monitor speed offset] is added to the speed at the timing the SS1 command is turned off.
If the observation speed is exceeded, the STO function is activated after the time set in [Pr. PSA15 Safety sub-function -
Speed detection delay time] has lapsed.
0 r/min
(mm/s)
OFF
ON
ON
OFF
Servo motor speed
SS1C (SS1 command)
ON (disabled)
OFF (enabled)
SS1S (SS1 output)
ON (monitoring)
STOS (STO output)
OFF (shut-off)
Base circuit
(energy supply to
servo motor)
ALM (malfunction)
OFF (enabled)
Speed detection
delay time
Deceleration
Deceleration monitor delay time
STO state
Deceleration monitor
time constant
Deceleration monitor speed offset
Stop speed
Command
Feedback
ON (disabled)
SS1/SS2 deceleration monitor time