6.
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.
7.
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
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. If the application does
not run well, check the VVC
plus
PM settings. Recommen-
dations for different applications can be seen in
.
Application
Settings
Low inertia applications
I
Load
/I
Motor
<5
1-17 Voltage filter time const.
to be
increased by factor 5 to 10
1-14 Damping Gain
should be
reduced
1-66 Min. Current at Low Speed
should be reduced (<100%)
Low inertia applications
50>I
Load
/I
Motor
>5
Keep calculated values
High inertia applications
I
Load
/I
Motor
> 50
1-14 Damping Gain
,
1-15 Low Speed
Filter Time Const.
and
1-16 High
Speed Filter Time Const.
should be
increased
High load at low speed
<30% (rated speed)
1-17 Voltage filter time const.
should
be increased
1-66 Min. Current at Low Speed
should be increased (>100% for a
prolonged time can overheat the
motor)
Table 5.7 Recommendations for 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.
Starting torque can be adjusted in
1-66 Min. Current at Low
Speed
. 100% provides nominal torque as starting torque.
5.4.5 Automatic Energy Optimization (AEO)
NOTICE!
AEO is not relevant for PM motors.
Automatic Energy Optimization (AEO) is recommended for
•
Automatic compensation for oversized motors
•
Automatic compensation for slow system load
change
•
Automatic compensation for seasonal changes
•
Automatic compensation for low motor loading
•
Reduced energy consumption
•
Reduced motor heating
•
Reduced motor noise
To activate AEO, set parameter
1-03 Torque Characteristics
to
[2] Auto Energy Optim. CT
or
[3] Auto Energy Optim. VT
.
Commissioning
VLT
®
AQUA Drive FC 202
30
Danfoss A/S © 10/2014 All rights reserved.
MG20MA22
5
5
Содержание VLT AQUA Drive FC 202
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Страница 5: ...Index 83 Contents Instruction Manual MG20MA22 Danfoss A S 10 2014 All rights reserved...