Application-specific adjustments
Start the motor at nominal speed. If the application does
not run well, check the VVC
+
SynRM settings. Table 5.8
provides application-specific recommendations:
Application Settings
Low-inertia applications
I
Load
/I
Motor
<5
Increase 1-17 Voltage Filter Time
Const. by factor 5 to 10.
Reduce 1-14 Damping Gain.
Reduce 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 1-14 Damping Gain,
1-15 Low Speed Filter Time Const. and
1-16 High Speed Filter Time Const.
High-load at low speed
<30% (rated speed)
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.
Dynamic applications
Increase 14-41 AEO Minimum
Magnetization for highly dynamic
applications. Adjusting 14-41 AEO
Minimum Magnetization ensures a
good balance between energy
efficiency and dynamics. Adjust
14-42 Minimum AEO Frequency to
specify the minimum frequency at
which the adjustable frequency
drive should use minimum magneti-
zation.
Table 5.8 Recommendations for Different Applications
If the motor starts oscillating at a certain speed, increase
1-14 Damping Gain. Increase the damping gain value in
small steps. Depending on the motor, an optimum value
for this can be 10% or 100% higher than the default value.
5.4.6
Automatic Motor Adaptation (AMA)
AMA is a procedure which optimizes 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
entered nameplate data.
•
The motor shaft does not turn and no harm is
done to the motor while running the AMA.
•
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 [2] Enable reduced AMA.
•
If warnings or alarms occur, see chapter 7.4 List of
Warnings and Alarms.
•
Run this procedure on a cold motor for best
results.
To run AMA
1. Press [Main Menu] to access parameters.
2.
Scroll to parameter group 1-** Load and Motor
and press [OK].
3.
Scroll to parameter group 1-2* Motor Data and
press [OK].
4.
Scroll to 1-29 Automatic Motor Adaptation (AMA)
and press [OK].
5.
Select [1] Enable complete AMA and press [OK].
6. Follow the on-screen instructions.
7. The test runs automatically and indicates when it
is complete.
8. The advanced motor data is entered in parameter
group 1-3* Adv. Motor Data.
Commissioning Instruction Manual
30 Danfoss A/S © Rev. 09/2014 All rights reserved. MG33AP22
55
To Next Page
Loading...
Need help?
General