Setpoint speed is the speed controller input value (ramp
output smoothed via PT1 filter + position controller)
pn39 speed diff time defines the minimum time the speed deviation must be pre-
sent before the error flag is set.
The signal (error/warning) is reset immediately when the speed deviation is no
longer present. Additionally the internal response time of the monitoring is set to
zero during reset, so the response time is reduced after short deactivation of the
signal. As long as the signal remains inactive, the internal response time is in-
creased until it reaches the full value again (equal to the value parameterized in
pn39 ) after pn39 speed difference time has elapsed.
Example:
• blue graph: Speed => fluctuates around 150 rpm
• green graph: Counter => is incremented / decremented
• When the final value (100) is reached, the error flag is set.
• red graph: The error flag triggers the error in ru01
• yellow graph: As soon as the differential speed is no longer > 150 rpm, the error
flag is reset => reset is possible and is executed immediately in this case.
• green graph: The counter is decremented, but not reset immediately => short-
ened recovery time
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