Safety functions 65
The function-specific mute time for SMS is activated with a separate parameter
FSOGEN.39 Enable SMS mute time. After the parameter FSOGEN.39 has been
activated, the mute time parameter SMS.17 Mute time for SMS is used in limit hit
situations for the SMS function.
In monitoring start and zero speed limit situations, FSOGEN.31 Transient mute time
parameter is always used even if the SLSx and SMS specific mute times are enabled.
Mute time feature with the safety encoder
When there are spurious transients in encoder speed data, you can use the transient
mute time in the safety functions. The transient mute time can be set to cover the
transient situation with the parameters:
• FSOGEN.31 Transient mute time for safety function limit hits
• FSOGEN.32 Zero speed delay time for zero speed
• FSOGEN.33 Monitoring start delay for monitoring start.
When the safety encoder is used, function-specific mute times have no effect even if
they are enabled.
If the switching from encoder to safe speed estimate is allowed by parameter
S_ENCGEN.11 FSE diagnostic failure reaction, you must also configure the mute
times related to safe speed estimate. See section Configuring the FSO for FSE or
encoder failure situations.
Mute times in monitoring start, limit hit and zero speed situations
The parameters used for monitoring start, limit hit and zero speed situations are
described in the time diagram and table below.
A SLS trip limit
BSLS limit
C FSOGEN.51 Zero speed without encoder or FSOGEN.52 Zero speed with encoder
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