5.4.4 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 can be found 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)
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.
3.
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.
Test motor operation
1.
Start the motor at low speed (100–200 RPM). If
the motor does not turn, check the installation,
general programming, and motor data.
2.
Check if the start function in
parameter 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, 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
+
PM settings.
contains recommendations for various applications.
Application
Settings
Low-inertia applications
I
Load
/I
Motor
<5
Increase
parameter 1-17 Voltage filter
time const.
by factor 5–10.
Reduce
parameter 1-14 Damping
Gain
.
Reduce
parameter 1-66 Min. Current
at Low Speed
(<100%).
Low-inertia applications
50>I
Load
/I
Motor
>5
Keep the default values.
High-inertia applications
I
Load
/I
Motor
>50
Increase
parameter 1-14 Damping
Gain
,
parameter 1-15 Low Speed Filter
Time Const.
, and
parameter 1-16 High
Speed Filter Time Const.
High load at low speed
<30% (rated speed)
Increase
parameter 1-17 Voltage filter
time const.
Increase
parameter 1-66 Min. Current
at Low Speed
to adjust the starting
torque. 100% current provides
nominal torque as starting torque.
This parameter is independent of
parameter 30-20 High Starting Torque
Time [s]
and
parameter 30-21 High
Starting Torque Current [%]
). Working
at a current level higher than 100%
for a prolonged time can cause the
motor to overheat.
Table 5.7 Recommendations for Various Applications
Commissioning
Operating Instructions
MG33AQ02
Danfoss A/S © 07/2015 All rights reserved.
27
5
5
Summary of Contents for VLT AutomationDrive FC 301
Page 2: ......
