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4. SAFETY OBSERVATION FUNCTION
4.5.2 SS1 function
(1) Summary
Starts deceleration based on an input signal from an external device (EM2). After a specified time for the
check of stop, the STO function will be activated (SS1). This corresponds to stop category 1 of IEC
60204-1.
Be sure to set parameters because the SS1 function is also used for an emergency stop when an error
is detected in internal diagnosis.
(2) Summary of sequence
(a) SS1C (SS1 command)
The following shows operation sequence of the SS1 function. The SS1 function will operate by
turning off SS1C (SS1 command). The servo motor decelerates with the dynamic brake, electronic
dynamic brake, or forced stop. Simultaneously, the time from activation of the SS1 function is
calculated, and the STO function will operate when the time specified with [PSA03 SS1/SS2
monitoring deceleration time] has passed. Turning SS1C (SS1 command) back to on will return to
normal operation.
Servo motor
speed
SS1C
(SS1 command)
WNG (Warning)
STOS
(STO output)
SS1S
(SS1 output)
0 r/min
ON (disabled)
OFF (enabled)
ON (alarm)
OFF (no alarm)
ON
OFF (shut-off)
ON
OFF (shut-off)
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SS1 in progress
STO status
SS1/SS2 monitoring
deceleration time
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