Commander SE Advanced User Guide
191
Issue Number: 4
Motor Map Parameters
It is important that before an autotune is carried out, all the motor map parameters are set correctly. The motor map
parameters are:
Parameter 06 - motor rated current
The motor rated current is the 100% full load current for the motor.
Parameter 07 - motor rated speed
The motor rated speed is the slip speed at 100% full load current.
Parameter 08 - motor rated voltage
This is the rated voltage of the motor at rated frequency.
Parameter 09 - motor power factor
This is the power factor of the motor when at 100% full load current.
In addition to these,
parameters 02 - maximum speed, parameter 39 - motor rated frequency and parameter 40 - number of
motor poles
, should be set correctly if the motor isn't a standard 50/60Hz motor.
Non-rotating Autotune
When the drive carries out an autotune, its main aim is to measure the motor stator resistance. The drive then uses this
measurement to calculate the correct voltage to frequency profile to apply to the motor. The drive also measures the system
voltage offset which is the voltage drop within the drive and between the drive and the motor. The drive than uses this figure
to compensate for the volt drop to make sure it is applying the correct voltage to the motor.
Rotating autotune
As well as measuring the motors stator resistance and system voltage offset, it measures the rated magnetising current and
the total system leakage inductance. The drive uses these figures to calculate the full load power factor for the motor. This is
then used to calculate the correct active current for the motor. The advantage of having a correctly calculated power factor is
that a more accurate slip compensation (if enabled) will be applied to the motor.
After an autotune has been carried out, the measured parameters are automatically saved in the drive.
Power factor
It is also important that the correct power factor is entered into the drives motor map. This is so the drive knows the correct
magnetising and active current for the motor. Various parameters and values are calculated from these parameters so that if
these values are incorrect, these parameters will be incorrect.
The power factor is the angle between the active current and the current magnitude at 100% full load motor rated current.
Output
frequency
Motor
voltage
Motor rated
frequency
Motor rated
frequency / 2
Motor rated
voltage / 2
Motor rated
voltage
Standard
V/f profile
Open loop vector or
fixed boost increase the
motor voltage at low
frequency
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Страница 142: ...142 Commander SE Advanced User Guide Issue Number 4 Figure 6 9 Input line reactor 4400 0241 All dimensions in mm...
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