Mitsubishi Electric MR-D30 Instruction Manual page 107

4. SAFETY OBSERVATION FUNCTION
(4) Stop observation
The SOS function observes both command speed and feedback speed.
(a) Speed command observation
This observes that an absolute value of the command speed does not exceed the set value of [Pr.
PSA04 SS2/SOS standstill speed] during the stop observation. When an excess of command speed
continues for the set value of [Pr. PSA15 SLS/SS2/SOS speed detection delay time], the STO
function will start.
Servo motor speed
SS2C (SS2 command)
ALM (Malfunction)
Base circuit (Energy
supply to the servo
motor)
STOS (STO output)
SOSS (SOS output)
(b) Speed feedback observation
This observes that an absolute value of the speed feedback does not exceed the set value of [Pr.
PSA04 SS2/SOS standstill speed] during the stop observation. When an excess of speed feedback
continues for the set value of [Pr. PSA15 SLS/SS2/SOS speed detection delay time], the STO
function will start.
Servo motor speed
SS2C (SS2 command)
ALM (Malfunction)
Base circuit (Energy
supply to the servo
motor)
STOS (STO output)
SOSS (SOS output)
Standstill
speed
0 r/min
ON (disabled)
OFF (enabled)
ON (no alarm)
OFF (alarm)
ON
OFF
ON
OFF (shut-off)
ON (observation
in progress)
OFF
Command
Standstill
speed
0 r/min
ON (disabled)
OFF (enabled)
ON (no alarm)
OFF (alarm)
ON
OFF
ON
OFF (shut-off)
ON (observation
in progress)
OFF
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Deceleration Stop observation (SOS)
Speed observation
error detection time
Command
Deceleration Stop observation (SOS)
Speed observation
error detection time
STO status
Feedback
STO status
Feedback