Mitsubishi Electric MELSERVO-J5 User Manual page 469

Stop monitoring
The SOS function monitors both the command speed and feedback speed.
■Speed command monitoring
During stop monitoring, this function monitors whether the absolute value of the command speed is within the value set in [Pr.
PSA04 Safety sub-function - Stop speed]. If the time of the speed command remains exceeded for the duration set in [Pr.
PSA15 Safety sub-function - Speed detection delay time], the STO function is activated.
Servo motor speed 0 r/min
ON (disabled)
SS2C (SS2 command)
OFF (enabled)
ON (disabled)
ALM (malfunction)
OFF (enabled)
Base circuit ON
(energy supply to
OFF
servo motor)
ON
STOS (STO output)
OFF (shut-off)
ON (monitoring)
SOSS (SOS output)
OFF
■Speed feedback monitoring
During stop monitoring, this function monitors whether the absolute value of the speed feedback is within the value set in [Pr.
PSA04 Safety sub-function - Stop speed]. If the time of the speed feedback remains exceeded for the duration set in [Pr.
PSA15 Safety sub-function - Speed detection delay time], the STO function is activated.
Servo motor speed 0 r/min
ON (disabled)
SS2C (SS2 command)
OFF (enabled)
ON (disabled)
ALM (malfunction)
OFF (enabled)
Base circuit ON
(energy supply to
OFF
servo motor)
ON
STOS (STO output)
OFF (shut-off)
ON (monitoring)
SOSS (SOS output)
OFF
Deceleration
Stop speed
Deceleration
Command
Stop speed
Stop monitoring (SOS)
Speed detection delay time
Command
Feedback
Stop monitoring (SOS)
Speed detection delay time
6 FUNCTIONAL SAFETY
6.4 Safety sub-function
STO state
6
STO state
Feedback
467