KFU 2-/4-
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13.8
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
Configuration
30
.
Parameter
Settings
No. Description
Min.
Max.
Fact.
sett.
477 Gradient percentage ramp
0 %/s
60000 %/s
x %/s
13.9 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
with the parameter
Frequency hysteresis
449
define two resonance points.
A block frequency 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. If 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-
gram.
Parameter
Settings
No. Description
Min.
Max.
Fact.
sett.
447 1. blocking frequency
0.00 Hz
999.99 Hz
0.00 Hz
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
Fehler! Es ist nicht möglich, durch die Bearbeitung von Feldfunktionen Objekte
zu erstellen.
