Illustration 3.1: Motor equivalent diagram for an asynchronous motor
1-30 Stator Resistance (Rs)
Range: Function:
Application
dependent*
[Application dependant] 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.
1-31 Rotor Resistance (Rr)
Range: Function:
Application
dependent*
[Application dependant] Fine-tuning R
r
will improve shaft performance. Set the rotor resistance value using one of these
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
r
value manually. Obtain the value from the motor supplier.
3. Use the R
r
default setting. The frequency converter establishes the setting on the basis of
the motor nameplate data.
1-35 Main Reactance (Xh)
Range: Function:
Application
dependent*
[Application dependant] 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
h
value manually. Obtain the value from the motor supplier.
3. Use the X
h
default setting. The frequency converter establishes the setting on the basis of
the motor name plate data.
NB!
This parameter cannot be adjusted while running.
1-36 Iron Loss Resistance (Rfe)
Range: Function:
Application
dependent*
[Application dependant] Enter the equivalent iron loss resistance (R
Fe
) value to compensate for iron losses in the motor.
The R
Fe
value cannot be found by performing an AMA.
The R
Fe
value is especially important in torque control applications. If R
Fe
is unknown, leave
par. 1-36
Iron Loss Resistance (Rfe)
on default setting.
NB!
This parameter cannot be adjusted while the motor is running.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
52
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3
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