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4. SAFETY OBSERVATION FUNCTION
4.5.5 SSM function
(1) Summary
Outputs a signal when the servo motor speed is within a regulated speed.
(2) Operation sequence
(a) SSMS (SSM output)
In the SSM function, SSMS (SSM output) is on when both the speed command and the speed
feedback are equal to or lower than the setting of [Pr. PSA18 SSM speed]. Absolute values of the
speed command and the speed feedback are observed not to exceed the SSM speed. SSMS (SSM
output) is off when the either one exceeding the SSM speed is detected.
SSMS (SSM output) is on when the absolute values of both the speed command and the speed
feedback are decreased, exceeding the setting value of [Pr. PSA20 SSM hysteresis width] from the
SSM speed. Setting [Pr. PSA20 SSM hysteresis width] properly prevents chattering of SSMS (SSM
output) at the time of the servo motor speed change around the SSM speed.
SSMS
(SSM output)
(3) Parameter setting
When using the SSM function, set the parameters as follows.
(a) SSM speed
Set a speed threshold for the speed observation referring to the operation sequence.
(b) SSM hysteresis width
Set a hysteresis width necessary to prevent chattering of SSMS (SSM output) referring to the
operation sequence.
Feedback
SSM speed
Command
ON
OFF
Parameter
PSA18
PSA19
Name
SSM speed
SSM hysteresis width
4 - 34
SSM
hysteresis width
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