Danfoss VLT AutomationDrive FC 302 Programming Manual page 45

Parameter Descriptions
NOTICE
Avoid generating external torque during AMA.
NOTICE
If one of the settings in parameter group 1-2* Motor
Data is changed, parameter 1-30 Stator Resistance (Rs) to
parameter 1-39 Motor Poles, the advanced motor
parameters, return to default setting.
NOTICE
AMA works problem-free on 1 motor size down, typically
works on 2 motor sizes down, rarely works on 3 sizes
down and never work on 4 sizes down. Keep in mind
that the accuracy of the measured motor data is poorer
when operating on motors smaller than nominal
frequency converter size.
3.3.7 1-3* Adv. Motor Data
Parameters for advanced motor data. Ensure that the
motor data in parameter 1-30 Stator Resistance (Rs) to
parameter 1-39 Motor Poles match the motor. The default
settings are based on standard motor values. If the motor
parameters are not set correctly, a malfunction of the
frequency converter system may occur. If the motor data
are unknown, running an AMA (Automatic Motor
Adaptation) is recommended. See
parameter 1-29 Automatic Motor Adaptation (AMA).
Parameter groups 1-3* Adv. Motor Data and 1-4* Adv. Motor
Data II cannot be adjusted while the motor is running.
NOTICE
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
X1 + Xh, see Illustration 3.6. These values are important
to magnetise the motor properly. For high-pole motors it
is highly recommended to perform this check.
P 1-33
P 1-30
I
X
1 R
1δ
s
U
1
P 1-36
R
Fe
Illustration 3.6 Motor Equivalent Diagram of an Asynchronous
Motor
MG33MJ02
Programming Guide
=
NL
P 1-34
X'
2δ
P 1-35 P 1-31
X
R'
h
r
Danfoss A/S © Rev. 10/2014 All rights reserved.
1-30 Stator Resistance (Rs)
Range: Function:
Size [ 0.0140 - Set the line to common stator resistance
related 140.0000 value. Enter the value from a motor
*
Ohm] datasheet or perform an AMA on a cold
motor.
NOTICE
For salient 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.
NOTICE
The parameter value is updated
after each torque calibration if
option [3] 1st start with store or
option [4] Every start with store is
selected in parameter 1-47 Torque
Calibration.
1-31 Rotor Resistance (Rr)
Range: Function:
Size [ 0.0100 - Set the rotor resistance value R
related 100.0000 improve shaft performance.
*
Ohm]
1.
2.
3.
NOTICE
Parameter 1-31 Rotor Resistance (Rr) does not have effect
when 1-10 Motor Construction is set to [1] PM, non-salient
SPM, [5] Sync. Reluctance.
to
r
Run an AMA on a cold motor.
The frequency converter
measures the value from the
motor. All compensations are
reset to 100%.
Enter the R value manually.
r
Obtain the value from the
motor supplier.
Use the R default setting. The
r
frequency converter establishes
the setting based on the motor
nameplate data.
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