6 FUNCTIONAL SAFETY
6.4 Safety sub-function
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Alarm occurrence
The STO function is activated also when an alarm occurs. While STO is activated, the energy supply to the servo motor is
shut off and the dynamic brake is activated. For the alarms that activate STO, refer to "List of alarm No./warning No." in the
following manual.
MR-J5 User's Manual (Troubleshooting)
For how to return to normal operation, refer to the following.
This timing chart is for the STO/DB stop method.
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STO shut-off during servo motor operation
• Turning off STOC (STO command) during operation will shut off energy without generating an alarm.
• Note that activating the STO function during servo motor operation will shorten the service life of the
dynamic brake relay.
After servo-off, turn off STOC (STO command) while the servo motor is stopped. To decelerate at the same time, use the SS1
function.
ON
0 r/min
(mm/s)
ON
OFF
Servo motor speed
ALM (malfunction)
ON (disabled)
OFF (enabled)
Base circuit
(energy supply to
servo motor)
STOS (STO output)
OFF (shut-off)
Normal operation
STO state
0 r/min
(mm/s)
ON
OFF
ON
Servo motor speed
STO command
ON (disabled)
OFF (enabled)
WNG (warning)
ON (enabled)
OFF (disabled)
Base circuit
(energy supply to
servo motor)
STOS (STO output)
OFF (shut-off)
Normal operation
Normal operation
STO state