Stator Resistance (Rs); Rotor Resistance (Rr); Stator Leakage Reactance (X1); Motor Equivalent Diagram Of An Asynchronous Motor - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions
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 magnetize the motor properly. For high-pole motors,
it is highly recommended to perform this check.
P 1-33
P 1-30
I
1 R X
1δ
s
U
1
P 1-36
R
Fe
Illustration 3.6 Motor Equivalent Diagram of an Asynchronous
Motor

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 is available,
divide the line-line value by 2 to
achieve the line-to-common (star
point) 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.
MG33MP02
Programming Guide
=
NL
P 1-34
X'
2δ
P 1-35 P 1-31
X
R'
h
r
Danfoss A/S © 10/2018 All rights reserved.

1-31 Rotor Resistance (Rr)

Range: Function:
NOTICE
Size [ 0.0100 -
related 100.0000
*
Parameter 1-31 Rotor Resistance (Rr)
Ohm]
has no effect when
parameter 1-10 Motor Construction is
set to [1] PM, non-salient SPM, [5]
Sync. Reluctance.
Set the rotor resistance value R
improve shaft performance using 1 of
these methods:
•
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
Obtain the value from the motor
supplier.
•
Use the R
frequency converter establishes
the setting based on the motor
nameplate data.

1-33 Stator Leakage Reactance (X1)

Range: Function:
NOTICE
Size [ 0.0400 -
related 400.0000
*
This parameter is only relevant for
Ohm]
asynchronous motors.
Set the stator leakage reactance of the
motor using 1 of these methods:
•
•
•
See Illustration 3.6.
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.
to
r
value manually.
r
default setting. The
r
Run an AMA on a cold motor.
The frequency converter
measures the value from the
motor.
Enter the X value manually.
1
Obtain the value from the
motor supplier.
Use the X default setting. The
1
frequency converter establishes
the setting based on the motor
nameplate data.
51
3 3