For high load at low speed (<30% of rated speed), it is recommended that
parameter 1-17 Voltage filter time const.
is increased due to
non-linearity in the inverter at low speed.
1-14 Damping Gain
Default value: 120%
Parameter type: Range
2-setup: All setups
Conversion index: -
Data type: int16
Change during operation: True
The parameter stabilizes the PM motor to ensure smooth and stable operation. The value of damping gain controls the dynamic
performance of the PM motor. Low damping gain results in high dynamic performance and a high value results in a low dynamic
performance. The dynamic performance is related to the motor data and load type. If the damping gain is too high or low, the
control becomes unstable.
Table 43: Range:
Min: 0%
Max: 250%
Default value: 120%
1-15 Low Speed Filter Time Const.
Default value: 0.01 s
Parameter type: Range
2-setup: All setups
Conversion index: -2
Data type: u_int16
Change during operation: True
High-pass filter damping time constant determines the response time to load steps. Obtain quick control through a short damping
time constant. However, if this value is too short, the control becomes unstable. This time constant is used below 10% rated speed.
Table 44: Range:
Min: 0.01 s
Max: 20 s
Default value: 0.01 s
1-16 High Speed Filter Time Const.
Default value: 0.01 s
Parameter type: Range
2-setup: All setups
Conversion index: -2
Data type: u_int16
Change during operation: True
High-pass filter damping time constant determines the response time to load steps. Obtain quick control through a short damping
time constant. However, if this value is too short, the control becomes unstable. This time constant is used above 10% rated speed.
Table 45: Range:
Min: 0.01 s
Max: 20 s
Default value: 0.01 s
1-17 Voltage filter time const.
Default value: 0.01 s
Parameter type: Range
2-setup: All setups
Conversion index: -3
Data type: u_int16
Change during operation: True
Machine supply voltage filter time constant is used for reducing the influence of high-frequency ripples and system resonances in
the calculation of machine supply voltage. Without this filter, the ripples in the currents can distort the calculated voltage and affect
the stability of the system.
Table 46: Range:
Min: 0.001 s
Max: 1 s
Default value: 0.01 s
4.3.3 1-2* Motor Data
This parameter group comprises input data from the nameplate on the connected motor.
N O T I C E
These parameters cannot be adjusted while the motor is running.
AU363928304090en-000101 / 130R0982 | 45
Danfoss A/S © 2021.07
Parameters
VLT® Flow Drive FC 111
Programming Guide
