Danfoss VLT AutomationDrive FC 301 Operating Instructions Manual page 29

Commissioning
1. 1-24 Motor Current
2. 1-25 Motor Nominal Speed
3. 1-26 Motor Cont. Rated Torque
4. 1-39 Motor Poles
Run a complete AMA using 1-29 Automatic Motor
Adaptation (AMA) [1] Enable Complete AMA. If a complete
AMA is not performed, the following parameters must be
configured manually.
1. 1-30 Stator Resistance (Rs)
Enter line to common stator winding resistance
(Rs). If only line-line data are available, divide the
line-line value by 2 to achieve the line to
common value.
2. 1-37 d-axis Inductance (Ld)
Enter line to common direct axis inductance of
the PM motor.
If only line-line data are available, divide the line-
line value with 2 to achieve the line-common
value.
3. 1-40 Back EMF at 1000 RPM
Enter line-to-line back EMF of PM Motor at 1000
rpm mechanical speed (RMS value). Back EMF is
the voltage generated by a PM motor when no
frequency converter is connected and the shaft is
turned externally. Back EMF 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 e.g. 320 V at 1800 rpm, it can be calculated at
1000 rpm as follows: Back EMF = (Voltage/
RPM)*1000 = (320/1800)*1000 = 178. This is the
value that must be programmed for 1-40 Back
EMF at 1000 RPM.
Test motor operation
1. Start the motor at low speed (100 to 200 rpm). If
the motor does not turn, check installation,
general programming and motor data.
2. Check if start function in 1-70 PM Start Mode fits
the application requirements.
Rotor detection
This function is the recommended selection for
applications where the motor starts from standstill, e.g.
pumps or conveyors. On some motors, an acoustic 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 eg.
windmilling in fan applications. 2-06 Parking Current and
2-07 Parking Time can be adjusted. Increase the factory
setting of these parameters for applications with high
inertia.
MG33AP02
Operating Instructions
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
dations in different applications can be seen in Table 5.7.
Application
Low inertia applications
I /I
Load Motor
Low inertia applications
50>I /I
Load
High inertia applications
I /I
Load Motor
High load at low speed
<30% (rated speed)
Table 5.7 Recommendations in Different Applications
If the motor starts oscillating at a certain speed, increase
1-14 Damping Gain. Increase the value in small steps.
Depending on the motor, a good value for this parameter
can be 10% or 100% higher than the default value.
Application-specific adjustment when running Flux
Flux mode is the preferred control mode for optimum
shaft performance in dynamic applications. Perform an
AMA since this control mode requires precise motor data.
Depending on the application, further adjustments may be
required.
See chapter 5.4.3 Asynchronous Motor Set-up for application-
specific recommendations.
Danfoss A/S © Rev. 07/2014 All rights reserved.
+
PM settings. Recommen-
Settings
Increase 1-17 Voltage filter time
<5 const. by factor 5 to 10.
Reduce 1-14 Damping Gain.
Reduce 1-66 Min. Current at Low
Speed (<100%).
Keep default values.
>5
Motor
Increase 1-14 Damping Gain,
> 50 1-15 Low Speed Filter Time Const. and
1-16 High Speed Filter Time Const.
Increase 1-17 Voltage filter time
const.
Increase 1-66 Min. Current at Low
Speed to adjust starting torque.
100% current provides nominal
torque as starting torque. This
parameter is independent from
30-20 High Starting Torque Time [s]
and 30-21 High Starting Torque
Current [%]). Working at current level
higher than 100% for a prolonged
time can overheat the motor.
+
5 5
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