2-54 Parameter Descriptions
7000-TD002A-EN-P – September 2007
Stator Resistance [R Stator]
Linear Number: 129
Default Value: 0.0000 pu
Minimum Value: 0.0000 pu
Maximum Value: 0.5000 pu
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the per unit stator resistance of the motor. It is used in the calculation of the
stator voltage and in the software reconstruction of the rotor flux. Stator resistance is usually less than
0.01 pu unless the motor is very small or the motor cables are very long. This parameter can be set
manually or by auto-tuning.
Warning: An excessively high stator resistance may cause the drive to become unstable at low speed
and high load.
Total Leakage Inductance [L Total Leakage]
Linear Number: 130
Default Value: 0.25 pu
Minimum Value: 0.00 pu
Maximum Value: 0.75 pu
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the per-unit total leakage, short circuit, or transient inductance (Ls') of the motor.
It is approximately equal to the sum of the stator and rotor leakage inductances, and the cable
inductance, and has a typical value of 0.20 pu. The leakage inductance parameter is used in the
calculation of the stator voltage and in the software reconstruction of the rotor flux. This parameter can
be set manually or by auto-tuning.
Warning: An excessively high leakage inductance may cause the drive to become unstable at high speed
and high load.
Rotor Time Constant [T Rotor]
Linear Number: 132
Default Value: 1.50 sec
Minimum Value: 0.10 sec
Maximum Value: 10.00 sec
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the rotor time constant of the motor. Typical value is in the range 1.0 to 2.0 sec.
The rotor time constant varies significantly with rotor temperature (due to the change in rotor resistance),
which has some effect on the response of the flux regulator and the calculation of the slip frequency for
induction motors. This parameter can be set manually or by auto-tuning.
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