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Use this parameter to optimize the torque estimate in the full speed range. The estimated torque is based on the shaft power, P
shaft
= P
m
- R
s
x I
2
. Make sure that the R
s
value is correct. The R
s
value in this formula is equal to the power loss in the motor, the cable,
and the drive. When this parameter is active, the drive calculates the R
s
value during power-up, ensuring the optimal torque esti-
mate and optimal performance. Use this feature in cases when it is not possible to adjust
parameter 1-30 Stator Resistance (Rs)
on
each drive to compensate for the cable length, drive losses, and the temperature deviation on the motor.
Op-
tion
Name
Description
[0]*
Off
[1]
1
st
start after
pwr-up
Calibrates at the 1
st
start-up after power-up and keeps this value until reset by a power cycle.
[2]
Every start
Calibrates at every start-up, compensating for a possible change in motor temperature since last start-
up. The value is reset after a power cycle.
[3]
1
st
start with
store
The drive calibrates the torque at the 1
st
start-up after power-up. This option is used to update motor
parameters:
Parameter 1-30 Stator Resistance (Rs).
Parameter 1-33 Stator Leakage Reactance (X1).
Parameter 1-34 Rotor Leakage Reactance (X2).
Parameter 1-37 d-axis Inductance (Ld).
[4]
Every start
with store
The drive calibrates the torque at every start-up, compensating for a possible change in motor temper-
ature since last start-up. This option is used to update motor parameters:
Parameter 1-30 Stator Resistance (Rs).
Parameter 1-33 Stator Leakage Reactance (X1).
Parameter 1-34 Rotor Leakage Reactance (X2).
Parameter 1-37 d-axis Inductance (Ld).
Parameter 1-48 d-axis Inductance Sat. Point
Table 99: Parameter 1-48 d-axis Inductance Sat. Point
1-48 d-axis Inductance Sat. Point
Default value: Size related
Parameter type: Range, 1 - 500%
Setup: All setups
Conversion index: 0
Data type: Int16
Change during operation: True
N O T I C E
Run an AMA to set the value of this parameter. Edit the value manually only when the application requires a value other than
determined by AMA.
Select the d-axis inductance saturation point. The drive uses this value to optimize the performance of SynRM motors. Select the
value that matches the point where the inductance equals the mean value of
parameter 1-37 d-axis Inductance (Ld)
and
parameter
1-44 d-axis Inductance Sat. (LdSat)
, as percentage of nominal current.
Parameter 1-49 q-axis Inductance Sat. Point
Table 100: Parameter 1-49 q-axis Inductance Sat. Point
1-49 q-axis Inductance Sat. Point
Default value: Size related
Parameter type: Range, 1 - 200%
Setup: All setups
Conversion index: 0
Data type: Uint16
Change during operation: False
AU275636650261en-000101 / 130R0334 | 87
Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide