Danfoss VLT AutomationDrive FC 301 Programming Manual page 39

Parameter Descriptions
Application Settings
Flux sensorless control Adjust parameter 1-53 Model Shift
principle only Frequency.
Example 1: If the motor oscillates at
5 Hz, and dynamics performance is
required at 15 Hz, set
parameter 1-53 Model Shift Frequency
to 10 Hz.
Example 2: If the application
involves dynamic load changes at
low speed, reduce
parameter 1-53 Model Shift Frequency.
Observe the motor behavior to
make sure that the model shift
frequency is not reduced too much.
Symptoms of inappropriate model
shift frequency are motor oscillations
or frequency converter tripping.
Table 3.3 Recommendations for Flux Applications
3.2.4 PM Motor Set-up
NOTICE
Valid for FC 302 only.
This section describes how to set up a PM motor.
Initial programming steps
To activate PM motor operation, select [1] PM, non-salient
SPM in parameter 1-10 Motor Construction.
Programming motor data
After selecting a PM motor, the PM motor-related
parameters in parameter groups 1-2* Motor Data, 1-3* Adv.
Motor Data, and 1-4* Adv. Motor Data II are active.
The necessary data is on the motor nameplate and on the
motor datasheet.
Program the following parameters in the order listed:
1. Parameter 1-24 Motor Current.
2. Parameter 1-25 Motor Nominal Speed.
3. Parameter 1-26 Motor Cont. Rated Torque.
4. Parameter 1-39 Motor Poles.
Run a complete AMA using parameter 1-29 Automatic
Motor Adaptation (AMA) [1] Enable Complete AMA.
If a complete AMA is not performed, configure the
following parameters manually:
1. Parameter 1-30 Stator Resistance (Rs)
Enter the line-to-common stator winding
resistance (Rs). If only line-line data is available,
divide the line-line value by 2 to get the line-
common value.
2. Parameter 1-37 d-axis Inductance (Ld)
MG33MO02
Programming Guide
3.
Test motor operation
1.
2.
Rotor detection
This function is the recommended selection for
applications where the motor starts from standstill, for
example pumps or conveyors. On some motors, a sound is
heard when the frequency converter performs the rotor
detection. This does not harm the motor.
Parking
This function is the recommended selection for
applications where the motor is rotating at slow speed, for
example windmilling in fan applications.
Parameter 2-06 Parking Current and parameter 2-07 Parking
Time can be adjusted. Increase the factory setting of these
parameters for applications with high inertia.
Application-specific adjustment when running VVC
VVC + is the most robust control mode. In most situations,
it provides optimum performance without further
adjustments. Run a complete AMA for best performance.
Start the motor at nominal speed. If the application does
not run well, check the VVC
contains recommendations for various applications.
Danfoss A/S © 01/2018 All rights reserved.
Enter the line-to-common direct axis inductance
of the PM motor.
If only line-line data is available, divide the line-
line value by 2 to get the line-common value.
Parameter 1-40 Back EMF at 1000 RPM.
Enter the line-to-line back EMF of the PM Motor
at 1000 RPM (RMS value). Back EMF is the voltage
generated by a PM motor when no frequency
converter is connected and the shaft is turned
externally. It is normally specified for nominal
motor speed or for 1000 RPM measured between
2 lines. If the value is not available for a motor
speed of 1000 RPM, calculate the correct value as
follows:
If back EMF is, for example, 320 V at 1800 RPM, it
can be calculated at 1000 RPM as follows:
Back EMF = (Voltage/RPM)x1000 =
(320/1800)x1000 = 178.
Start the motor at low speed (100–200 RPM). If
the motor does not turn, check the installation,
general programming, and motor data.
Check if the start function in parameter 1-70 Start
Mode fits the application requirements.
+
PM settings. Table 3.4
3 3
+
37