4.11 SSM
Definition according to EN 61800-5-2:
"The SSM function supplies a safe out‐
put signal to indicate whether the motor
speed is below a specified limit value."
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Example of how the function can be used
Example Possible solution
A centrifuge may only be filled below a velocity de‐
fined by the user.
● SSM is active through the configuration of
the Safety Integrated Extended Functions.
● The converter safely monitors the centrifuge
speed and enables the process to advance
to the next step using the "Status SSM" sta‐
tus bit.
Note
SSM is a pure signaling function
Contrary to other safety functions integrated in the drive, a violation of the SSM limit does not
result in a drive-based stop response.
4.11.1 Details and parameterization
The "Safe Speed Monitor" (SSM) function provides a reliable method for detecting when a
speed limit has been fallen below in both directions of rotation, e.g. for zero speed detection. A
failsafe output signal is available for further processing.
Features
● Safe monitoring of the specified speed limit
● Parameterizable hysteresis
● Adjustable filter time (PT1 filter)
Safety functions integrated in the drive
4.11 SSM
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB 147
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