D-119
Parameter Reference
AC30V series Variable Speed Drive
Tr Adaptation
Parameters::Motor Control::Tr Adaptation
When the motor control strategy is set to Closed Loop vector, i.e. using encoder feedback, it is important to know the actual value of the rotor
time constant. This value is measured by the autotune, but it will change as the motor temperature changes. The purpose of this module is to
track the changing value of the rotor time constant, and to use all available feedback information to make the best possible estimate of its actual
value at any given time.
PNO Parameter Descriptions
Tr Adaptation Output
This diagnostic shows the factor by which the nominal rotor time constant is multiplied, in order to give the actual rotor time constant
passed to the motor control.
Actual Rotor T Const
This diagnostic shows the actual value of rotor time constant used by the motor control. This value is the nominal value stored in the
Induction Motor Data, modified by this module to give a value as close as possible to the real value.
Demanded Terminal Volts
In order to maintain constant flux for a given load, the motor terminal volts must be controlled. This diagnostic gives the terminal
volts demand used by the control loop.
Terminal Volts
This diagnostic shows motor terminal volts. It is included here for convenience, to compare with the demanded terminal volts to
make sure that the terminal volts control loop is able to close the loop to the demanded value.
Max Available Volts
This diagnostic shows the maximum achievable value of motor terminal volts. So for example, when running at rated load, the
required motor terminal volts may be 400v. But if the mains is low, the maximum achievable volts may only be 390v. This diagnostic
shows what is achievable at any particular time, and may be useful to explain why the motor volts may be lower than expected.
