Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
Motor model settings.Motor control97
4.500 kHz / real32When parameter 97.9 Switching freq mode is set to
Custom, defines the switching frequency when it is not
otherwise being internally limited.
Switching frequency
reference
97.1
Note: This is an expert level parameter and should not
be adjusted without appropriate skill.
1000 = 1 kHz / 1000 =
1 kHz
Switching frequency reference.0.000 ... 24.000 kHz
1.500 kHz / real32When parameter 97.9 Switching freq mode is set to
Custom, defines a minimum switching frequency
Minimum switching
frequency
97.2
reference. The actual switching frequency will not fall
below this limit under any circumstances.
Note: This is an expert level parameter and should not
be adjusted without appropriate skill.
Note: The drive has internal switching frequency limits
that may override the value entered here.
1000 = 1 kHz / 1000 =
1 kHz
Minimum switching frequency.0.000 ... 24.000 kHz
100 % / real32Defines the slip gain which is used to improve the
estimated motor slip. 100% means full slip gain; 0%
Slip gain97.3
means no slip gain. The default value is 100%. Other
values can be used if a static speed error is detected
despite having the setting at full slip gain.
Example (with nominal load and nominal slip of 40
rpm): A 1000 rpm constant speed reference is given to
the drive. Despite having full slip gain (= 100%), a
manual tachometer measurement from the motor axis
gives a speed value of 998 rpm. The static speed error
is 1000 rpm - 998 rpm = 2 rpm. To compensate the
error, the slip gain should be increased to 105%
(2 rpm / 40 rpm = 5%).
1 = 1 % / 100 = 1 %Slip gain.0...200 %
-2 % / real32Defines the minimum allowed voltage reserve. When
the voltage reserve has decreased to the set value, the
drive enters the field weakening area.
Voltage reserve97.4
Note: This is an expert level parameter and should not
be adjusted without appropriate skill.
If the intermediate circuit DC voltage
U
dc
= 550 V and
the voltage reserve is 5%, the rms value of the
maximum output voltage in steady-state operation is
0.95 × 550 V / sqrt(2) = 369 V
The dynamic performance of the motor control in the
field weakening area can be improved by increasing
the voltage reserve value, but the drive enters the field
weakening area earlier.
1 = 1 % / 100 = 1 %Voltage reserve.-5...50 %
Parameters 527
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