Danfoss VLT HVAC Drive FC 131 Programming Manual page 47

VLT® HVAC Drive FC 131
Programming Guide
1-14 to 1-17 VVC+ PM
The default control parameters for VVC+ PM motor control core are optimized for applications and inertia load in the range of
50>Jl/Jm>5. Jl is load inertia from the application and Jm is machine inertia.
For low inertia applications (Jl/Jm<5), it is recommended that parameter 1-17 Voltage filter time const. is increased with a factor of 5–
10. Sometimes, parameter 14-08 Damping Gain Factor should also be reduced to improve performance and stability.
For high-inertia applications (Jl/Jm>50), increase parameter 1-15 Low Speed Filter Time Const. and parameter 1-16 High Speed Filter
Time Const. to improve performance and stability.
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%
Conversion index: -
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 42: Range:
Min: 0%
1-15 Low Speed Filter Time Const.
Default value: 0.01 s
Conversion index: -2
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 43: Range:
Min: 0.01 s
1-16 High Speed Filter Time Const.
Default value: 0.01 s
Conversion index: -2
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 44: Range:
Min: 0.01 s
1-17 Voltage filter time const.
Default value: 0.01 s
Conversion index: -3
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 45: Range:
Min: 0.001 s
Danfoss A/S © 2022.05
Parameter type: Range
Data type: int16
Max: 250%
Parameter type: Range
Data type: u_int16
Max: 20 s
Parameter type: Range
Data type: u_int16
Max: 20 s
Parameter type: Range
Data type: u_int16
Max: 1 s
2-setup: All setups
Change during operation: True
Default value: 120%
2-setup: All setups
Change during operation: True
Default value: 0.01 s
2-setup: All setups
Change during operation: True
Default value: 0.01 s
2-setup: All setups
Change during operation: True
Default value: 0.01 s
AU370727746889en-000101 / 130R0994 | 47
Parameters