Danfoss VLT AutomationDrive FC 300 Programming Manual page 41

Parameter Descriptions
•
For the best adaptation of the frequency
converter, run AMA on a cold motor.
•
AMA cannot be performed while the motor is
running.
•
AMA cannot be performed on permanent magnet
motors.
NOTE
It is important to set motor parameter group 1-2* Motor
Data correctly, since these form part of the AMA algorithm.
An AMA must be performed to achieve optimum dynamic
motor performance. It may take up to 10 min, depending
on the power rating of the motor.
NOTE
Avoid generating external torque during AMA.
NOTE
If one of the settings in parameter group 1-2* Motor Data
is changed, 1-30 Stator Resistance (Rs) to 1-39 Motor Poles,
the advanced motor parameters, will return to default
setting.
NOTE
AMA will work problem-free on 1 motor size down,
typically work on 2 motor sizes down, rarely work on 3
sizes down and never work on 4 sizes down. Keep in mind
that the accuracy of the measured motor data will be
poorer when operating on motors smaller than nominal
frequency converter size.
3.3.5 1-3* Adv. Motor Data
Parameters for advanced motor data. The motor data in
1-30 Stator Resistance (Rs) to 1-39 Motor Poles must match
the relevant motor in order to run the motor optimally.
The default settings are figures based on common motor
parameter values from standard motors. If the motor
parameters are not set correctly, a malfunction of the
frequency converter system may occur. If the motor data is
not known, running an AMA (Automatic Motor Adaptation)
is recommended. See the Automatic Motor Adaptation
section in the Design Guide. The AMA sequence will adjust
all motor parameters except the moment of inertia of the
rotor and the iron loss resistance (1-36 Iron Loss Resistance
(Rfe)).
Parameter groups 1-3* and 1-4* cannot be adjusted while
the motor is running.
®
VLT AutomationDrive Programming Guide
I
1
U
Illustration 3.6 Motor equivalent diagram for an asynchronous
motor
NOTE
A simple check of the X1 + Xh sum value is to divide the
line to line motor voltage by the sqrt(3) and divide this
value by the motor no load current. [VL-L/sqrt(3)]/I
+ Xh. These values are important to properly magnetize
the motor. For high pole motors it is highly recommended
to perform this check.
1-30 Stator Resistance (Rs)
Range:
Size
related
1-31 Rotor Resistance (Rr)
Range:
Size
related
®
MG33MG02 - VLT is a registered Danfoss trademark
P 1-33
P 1-30
X
R
s 1δ
1
P 1-36
R
Fe
Function:
[ 0.0140 - Set the line to common stator
140.0000 resistance value. Enter the value from a
*
Ohm] motor data sheet or perform an AMA
on a cold motor.
NOTE
For PM motors:
AMA is not available.
If only line-line data are available,
divide the line-line value by 2 to
achieve the line to common
(starpoint) value. Alternatively
measure the value with an
ohmmeter, this also takes the
resistance of the cable into
account. Divide the measured
value by 2 and enter the result.
Function:
[ 0.0100 - Fine-tuning R
100.0000
performance. Set the rotor resistance
*
Ohm]
value using one of these methods:
1. Run an AMA on a cold motor.
The frequency converter will
measure the value from the
P 1-34
X'
2δ
P 1-35 P 1-31
X
R'
h
r
= X1
NL
will improve shaft
r
39
3 3