Ss2/Sos Function - Mitsubishi Electric MR-D30 Instruction Manual

4. SAFETY OBSERVATION FUNCTION
(4) Parameter setting
To set the parameters, refer to section 4.3.3. Set the parameters referring to section 4.4.1 when using
the SS1 function in the safety observation function control by input device, and section 4.4.3 when using
the SS1 function in the safety observation function control by network. Additionally, when using SS1S
(SS1 output) with output devices, refer to 4.4.2 to set parameters.
The SS1 function is used for an emergency stop when an error is detected in internal diagnosis.
Therefore, be sure to set [Pr. PSA03 SS1/SS2 monitoring deceleration time] to a time required for the
servo motor to stop.

4.5.3 SS2/SOS function

(1) Summary
When SS2C (SS2 command) turns off, the SS2/SOS function executes the stop observation (SOS) after
a delay time set in advance or after standby until the servo motor stop is detected (SS2).
(2) Summary of sequence
The SS2/SOS function will operate when SS2C (SS2 command) is turned off.
The SS2/SOS function executes monitoring deceleration at first. Next, it will wait until the speed
decelerates to a fixed speed or until a specified time passes. During this time, execute deceleration with
the controller. Refer to (3) in this section for details of speed observation and delay time observation
during deceleration.
After the deceleration is completed, the stop observation starts. The stop observation monitors the
speed command, speed feedback, and position feedback. Refer to (4) in this section for details of these
observations. SOSS (SOS output) outputs on during the stop observation.
The SS2/SOS function ends when SS2C (SS2 command) is turned back to on.
Servo motor speed
Servo motor feedback
position
SS2C (SS2 command)
SOSS (SOS output)
SS2S (SS2 output)
Standstill
speed
0 r/min
0 pulse/s
ON (disabled)
OFF (enabled)
ON (observation
in progress)
OFF
ON (disabled)
OFF (enabled)
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Deceleration Stop observation (SOS)
SOS allowance value
of position deviation