Automatic Motor Adaptation - Danfoss VLT AQUA Drive FC 202 Instruction Manual

Start-up and Functional Tes...
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 choice for applications
where the motor starts from standstill, e.g., pumps or
conveyors. On some motors, an acoustic sound is heard
when the impulse is sent out. This does not harm the
motor.
Parking
This function is the recommended choice for applications
where the motor is rotating at slow speed, e.g.,
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.
Start the motor at nominal speed. In case the application
does not run well, check the VVC
Recommendations for different applications can be seen in
Table 3.2.
Application Settings
Low inertia applications 1-17 Voltage filter time const. to be
I /I <5 increased by factor 5 to 10
Load Motor
1-14 Damping Gain should be
reduced
1-66 Min. Current at Low Speed
should be reduced (<100%)
Low inertia applications Keep calculated values
50>I /I >5
Load Motor
High inertia applications 1-14 Damping Gain, 1-15 Low Speed
I /I > 50 Filter Time Const. and 1-16 High
Load Motor
Speed Filter Time Const. should be
increased
High load at low speed 1-17 Voltage filter time const. should
<30% (rated speed) be increased
1-66 Min. Current at Low Speed
should be increased (>100% for
longer time can overheat the motor)
Table 3.2 Recommendations for Different Applications
®
VLT AQUA Drive
Instruction Manual
plus
PM settings.
®
MG20M922 - VLT is a registered Danfoss trademark
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.
Starting torque can be adjusted in 1-66 Min. Current at Low
Speed. 100% provides nominal torque as starting torque.

3.5 Automatic Motor Adaptation

Automatic motor adaptation (AMA) is a test procedure that
measures the electrical characteristics of the motor to
optimize compatibility between the adjustable frequency
drive and the motor.
•
The adjustable frequency drive builds a
mathematical model of the motor for regulating
output motor current. The procedure also tests
the input phase balance of electrical power. It
compares the motor characteristics with the data
entered in parameters 1-20 to 1-25.
•
It does not cause the motor to run or harm to
the motor
•
Some motors may be unable to run the complete
version of the test. In that case, select [2] Enable
reduced AMA
•
If an output filter is connected to the motor,
select Enable reduced AMA
•
If warnings or alarms occur, see 8 Warnings and
Alarms
•
Run this procedure on a cold motor for best
results
NOTE!
The AMA algorithm does not work when using PM motors.
To run AMA
1. Press [Main Menu] to access parameters.
2. Scroll to parameter group 1-** Load and Motor.
3. Press [OK].
4. Scroll to parameter group 1-2* Motor Data.
5. Press [OK].
6. Scroll to 1-29 Automatic Motor Adaptation (AMA).
7. Press [OK].
8. Select [1] Enable complete AMA.
9. Press [OK].
10. Follow on-screen instructions.
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