Automatic Energy Optimization (Aeo) - Danfoss VLT AQUA Drive FC 202 Installation Manual

Commissioning
It is also possible to measure the value with an
ohmmeter, which takes the resistance of the
cable into account. Divide the measured value by
2 and enter the result.
6. Parameter 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 by 2 to achieve the line-common
(starpoint) value.
5 5
It is also possible to measure the value with an
inductance meter, which takes the inductance of
the cable into account. Divide the measured
value by 2 and enter the result.
7. Parameter 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
drive is connected and the shaft is turned
externally. Back EMF is normally specified for
nominal motor speed or for 1,000 RPM measured
between two 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 parameter 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 parameter 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. 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.
Start the motor at nominal speed. If the application does
not run well, check the VVC
dations for different applications can be seen in Table 5.7.
58
®
VLT AQUA Drive FC 202 Low Harmonic Drive
+
PM settings. Recommen-
Danfoss A/S © 10/2015 All rights reserved.
Application Settings
Low inertia applications Parameter 1-17 Voltage filter time
I /I <5 const. to be increased by factor 5 to
Load Motor
10
parameter 1-14 Damping Gain should
be reduced
parameter 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 Parameter 1-14 Damping Gain,
I /I > 50 parameter 1-15 Low Speed Filter Time
Load Motor
Const. and parameter 1-16 High
Speed Filter Time Const. should be
increased
High load at low speed Parameter 1-17 Voltage filter time
<30% (rated speed) const. should be increased
parameter 1-66 Min. Current at Low
Speed should be increased (>100%
for a prolonged time can overheat
the motor)
Table 5.8 Recommendations for Different Applications
If the motor starts oscillating at a certain speed, increase
parameter 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 parameter 1-66 Min.
Current at Low Speed. 100% provides nominal torque as
starting torque.

5.4.6 Automatic Energy Optimization (AEO)

NOTICE!
AEO is not relevant for permanent magnet motors.
AEO is a procedure which minimizes voltage to the motor,
thereby reducing energy consumption, heat, and noise.
To activate AEO, set parameter 1-03 Torque Characteristics to
[2] Auto Energy Optim. CT or [3] Auto Energy Optim. VT.
MG21B322