14.8 Percentage Value Ramps
The percentage value ramps scale the change of the reference value (in percent) for
the corresponding input function. The acceleration and deceleration of the drive are
parameterized via the frequency ramps.
The behavior Gradient percentage ramp 477 corresponds to a function which takes
the time behavior of the drive system into account. If the parameter is set to 0 %/s,
this function is deactivated and a direct reference value modification for the following
function is obtained.
The default value depends on the
30.
14.9 Block Frequencies
In certain applications, it is necessary to fade out reference frequencies. In this way,
resonance points of the system as stationary operating points are avoided. The pa-
rameters
1st block frequency 447 and 2nd block frequency 448
Frequency hysteresis 449 define two resonance points.
A block fr
equency is active if the parameter values of the block frequency and the
frequency hysteresis are not equal to 0.00 Hz.
The area faded out as a stationary working point by the hysteresis is passed through
as quickly as possible according to the ramp set. I
f the output frequency is limited as
a result of the selected control parameter settings, e.g. if the current limit is reached,
the hysteresis is passed through with a delay. The behavior of the reference value
can be determined from its direction of movement according to the following dia-
Parameter Settings
448 2. blocking frequency 0.00 Hz 999.99 Hz 0.00 Hz
449 Frequency hysteresis 0.00 Hz 100.00 Hz 0.00 Hz
internal
reference value
reference value output
f
block
hysteresis hysteresis
f +hysteresis
block
f -hysteresis
block
166 Operating Instructions ACU 06/13
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