Danfoss VLT HVAC Drive FC 102 Programming Manual page 42

Parameter Descriptions
small steps. Depending on the motor, this parameter can
be set to 10–100% higher than the default value.
1-10 Motor Construction
Select the motor construction type.
Option:
3 3
[0] Asynchron
*
[1] PM, non
salient SPM
[5] Sync.
Reluctance
3.3.4 1-14 to 1-17 VVC
The default control parameters for VVC
core are optimised for HVAC applications and inertia load
in the range of 50>Jl/Jm>5, where Jl is load inertia from
the application and Jm is machine inertia.
For low inertia applications (Jl/Jm<5), it is recommended
that 1-17 Voltage filter time const. is increased with a factor
of 5–10 and, in some cases, 14-08 Damping Gain Factor
should also be reduced to improve performance and
stability.
For high inertia applications (Jl/Jm>50), it is recommended
that 1-15 Low Speed Filter Time Const., 1-16 High Speed Filter
Time Const., and 14-08 Damping Gain Factor are increased
to improve performance and stability.
For high load at low speed (<30% of rated speed), it is
recommended that 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 %]
*
40
VLT
Function:
For asynchronous motors.
Use for non-salient PM motors.
Use for synchronous reluctance motors.
NOTICE
This option has the following
firmware version limitations:
•
Version 4.2x and earlier – do
not use this option. There is
a risk of damage to the
frequency converter.
•
Version 4.3x – use this
option only when flying
start is enabled in parameter
parameter 1-73 Flying Start.
+
PM
+
PM motor control
Function:
The damping gain stabilises the PM machine in
order 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.
Danfoss A/S © 03/2015 All rights reserved.
®
HVAC Drive FC 102
1-15 Low Speed Filter Time Const.
Range:
Size
related
*
1-16 High Speed Filter Time Const.
Range:
Size
related
*
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
Parameter 1-20 Motor Power [kW], parameter 1-21 Motor
Power [HP], parameter 1-22 Motor Voltage, and
parameter 1-23 Motor Frequency have no effect when
parameter 1-10 Motor Construction is set to [1] PM, non-
salient SPM, [2] PM, salient IPM, [5] Sync. Reluctance.
Function:
[0.01 - High-pass filter damping time constant
20 s] 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
20 s] 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.
Function:
[0.001 - 1 Machine supply voltage filter time
s] 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.
MG11CE02