Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 40

Parameter Description
3.3.4 1-14 to 1-17 VVC
The default control parameters for VVC
core are optimized for applications and inertia load in the
range of 50>Jl/Jm>5. Jl is load inertia from the application
3 3
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
Range:
120 [0 -
% 250 %]
*
1-15 Low Speed Filter Time Const.
Range:
Size
related 20 s]
*
1-16 High Speed Filter Time Const.
Range:
Size
related 20 s]
*
38
+
PM
+
PM motor control
Function:
The damping gain stabilizes the PM machine to
run the PM machine smooth and stable. The
value of damping gain controls the dynamic
performance of the PM machine. High damping
gain gives low dynamic performance, and low
damping gain gives high dynamic performance.
The dynamic performance is related to the
machine data and load type. If the damping gain
is too high or low, the control becomes unstable.
Function:
[0.01 - 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 low, the control
becomes unstable. This time constant is
used below 10% rated speed.
Function:
[0.01 - 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 low, the control
becomes unstable. This time constant is
used above 10% rated speed.
Danfoss A/S © 05/2016 All rights reserved.
®
VLT Refrigeration Drive FC 103
1-17 Voltage filter time const.
Range:
Size
related
*
3.3.5 1-2* Motor Data
This parameter group contains input data from the
nameplate on the connected motor.
NOTICE
Changing the value of these parameters affects the
setting of other parameters.
NOTICE
The following parameters have no effect when
parameter 1-10 Motor Construction is set to [1] PM, non-
salient SPM, [2] PM, salient IPM, [5] Sync. Reluctance:
•
•
•
•
1-20 Motor Power [kW]
Range:
Size
related
*
Function:
[0.001 - 1 Supply voltage filter time constant is
s] 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.
Parameter 1-20 Motor Power [kW]
Parameter 1-21 Motor Power [HP]
Parameter 1-22 Motor Voltage
Parameter 1-23 Motor Frequency
Function:
[ 0.09 - Enter the nominal motor power in kW
3000.00 according to the motor nameplate data.
kW] The default value corresponds to the
nominal rated output of the unit.
Depending on the selections made in
parameter 0-03 Regional Settings, either
parameter 1-20 Motor Power [kW] or
parameter 1-21 Motor Power [HP] is made
invisible.
MG16H202