Stator Resistance (Rs); Rotor Resistance (Rr); Main Reactance (Xh); Iron Loss Resistance (Rfe) - Danfoss VLT Programming Manual

3 Parameter Description
3
Illustration 3.1: Motor equivalent diagram for an asynchronous motor

1-30 Stator Resistance (Rs)

Range:
Application [Application dependant]
dependent*

1-31 Rotor Resistance (Rr)

Range:
Application [Application dependant]
dependent*

1-35 Main Reactance (Xh)

Range:
Application [Application dependant]
dependent*
NB!
This parameter cannot be adjusted while running.

1-36 Iron Loss Resistance (Rfe)

Range:
Application [Application dependant]
dependent*
NB!
This parameter cannot be adjusted while the motor is running.
52
Function:
Set the stator resistance value. Enter the value from a motor data sheet or perform an AMA on a
cold motor. This parameter cannot be adjusted while the motor is running.
Function:
Fine-tuning R will improve shaft performance. Set the rotor resistance value using one of these
r
methods:
1. Run an AMA on a cold motor. The frequency converter will measure the value from the
motor. All compensations are reset to 100%.
2. Enter the R value manually. Obtain the value from the motor supplier.
r
3. Use the R default setting. The frequency converter establishes the setting on the basis of
r
the motor nameplate data.
Function:
Set the main reactance of the motor using one of these methods:
1. Run an AMA on a cold motor. The frequency converter will measure the value from the
motor.
2. Enter the X value manually. Obtain the value from the motor supplier.
h
3. Use the X default setting. The frequency converter establishes the setting on the basis of
h
the motor name plate data.
Function:
Enter the equivalent iron loss resistance (R
The R value cannot be found by performing an AMA.
Fe
The R value is especially important in torque control applications. If R
Fe
Iron Loss Resistance (Rfe)
par. 1-36
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
®
VLT HVAC Drive Programming Guide
) value to compensate for iron losses in the motor.
Fe
on default setting.
is unknown, leave
Fe