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112
Affinity User Guide
www.controltechniques.com Issue Number: 5
Following the completion of an autotune test the drive will go into the
inhibit state. The drive must be placed into a controlled disable condition
before the drive can be made to run at the required reference. The drive
can be put in to a controlled disable condition by removing the Enable
signal from terminal 31, setting the drive enable parameter Pr
6.15
to
OFF (0) or disabling the drive via the control word (Pr
6.42
& Pr
6.43
).
For further information refer to section
RFC
There are three autotune tests available in RFC mode, a stationary test,
a rotating test and an inertia measurement test. A stationary autotune
will give moderate performance whereas a rotating autotune will give
improved performance as it measures the actual values of the motor
parameters required by the drive. An inertia measurement test should be
performed separately to a stationary or rotating autotune.
•
The stationary autotune can be used when the motor is loaded and it
is not possible to remove the load from the motor shaft.
•
A rotating autotune first performs a stationary autotune, before
rotating the motor at
2
/
3
base speed in the forward direction for
approximately 30 seconds. The motor must be free from load for the
rotating autotune.
•
The inertia measurement test can measure the total inertia of the
load and the motor. This is used to set the speed loop gains (see
Speed loop gains
, below) and to provide torque feed forwards when
required during acceleration. During the inertia measurement test
the motor speed changes from
1
/
3
to
2
/
3
rated speed in the forward
direction several times. The motor can be loaded with a constant
torque load and still give an accurate result, however, non-linear
loads and loads that change with speed will cause measurement
errors.
To perform an autotune, set Pr
0.40
to 1 for a stationary test, 2 for a
rotating test, or 3 for an inertia measurement test and provide the drive
with both an enable signal (on terminal 31) and a run signal.
Following the completion of an autotune test the drive will go into the
inhibit state. The drive must be placed into a controlled disable condition
before the drive can be made to run at the required reference. The drive
can be put in to a controlled disable condition by removing the Enable
signal from terminal 31, setting the drive enable parameter Pr
6.15
to
OFF (0) or disabling the drive via the control word (Pr
6.42
& Pr
6.43
).
Setting Pr
0.40
to 4 will cause the drive to calculate the current loop
gains based on the previously measured values of motor resistance and
inductance. The drive does apply any voltage to the motor during this
test. The drive will change Pr
0.40
back to 0 as soon as the calculations
are complete (approximately 500ms).
For further information refer to section
This parameter defines the required switching frequency. The drive may
automatically reduce the actual switching frequency (without changing
this parameter) if the power stage becomes too hot. A thermal model of
the IGBT junction temperature is used based on the heatsink
temperature and an instantaneous temperature drop using the drive
output current and switching frequency. The estimated IGBT junction
temperature is displayed in Pr
7.34
. If the temperature exceeds 145
°
C
the switching frequency is reduced if this is possible (i.e >3kHz).
Reducing the switching frequency reduces the drive losses and the
junction temperature displayed in Pr
7.34
also reduces. If the load
condition persists the junction temperature may continue to rise again
above 145
°
C and the drive cannot reduce the switching frequency
further the drive will initiate an ‘O.ht1’ trip. Every second the drive will
attempt to restore the switching frequency to the level set in Pr
0.41
.
The full range of switching frequencies is not available on all ratings of
Affinity. See section 8.4
maximum available switching frequency for each drive rating.
6.2.19 Motor parameters
Open-loop
This parameter is used in the calculation of motor speed, and in applying
the correct slip compensation. When auto is selected, the number of
motor poles is automatically calculated from the rated frequency
(Pr
0.47
) and the rated full load rpm (Pr
0.45
). The number of poles =
120 * rated frequency / rpm rounded to the nearest even number.
RFC
This parameter must be set correctly for the vector control algorithms to
operate correctly. When auto is selected, the number of motor poles is
automatically calculated from the rated frequency (Pr
0.47
) and the rated
full load rpm (Pr
0.45
). The number of poles = 120 * rated frequency /
rpm rounded to the nearest even number.
The power factor is the true power factor of the motor, i.e. the angle
between the motor voltage and current.
Open-loop
The power factor is used in conjunction with the motor rated current
(Pr
0.46
) to calculate the rated active current and magnetizing current of
the motor. The rated active current is used extensively to control the
drive, and the magnetizing current is used in vector mode Rs
compensation. It is important that this parameter is set up correctly.
This parameter is obtained by the drive during a rotational autotune. If a
stationary autotune is carried out, then the nameplate value should be
entered in Pr
0.43
.
RFC
If the stator inductance (Pr
5.25
) contains a non-zero value, the power
factor used by the drive is continuously calculated and used in the vector
control algorithms (this will not update Pr
0.43
).
If the stator inductance is set to zero (Pr
5.25
) then the power factor
written in Pr
0.43
is used in conjunction with the motor rated current and
other motor parameters to calculate the rated active and magnetizing
currents which are used in the vector control algorithm.
This parameter is obtained by the drive during a rotational autotune. If a
stationary autotune is carried out, then the nameplate value should be
entered in Pr
0.43
.
Enter the value from the rating plate of the motor.
0.41 {5.18}
Maximum switching frequency
RW
Txt
RA
US
Ú
3 (0), 4 (1), 6 (2), 8 (3), 12 (4),
16 (5) kHz
Ö
3 (0)
0.42 {5.11}
No. of motor poles
RW
Txt
US
Ú
0 to 60 (Auto to 120 Pole)
Ö
Auto (0)
0.43 {5.10}
Motor rated power factor
RW
Uni
US
OL
Ú
0.000 to 1.000
Ö
0.850
0.44 {5.09}
Motor rated voltage
RW
Uni
RA
US
Ú
0 to
AC_VOLTAGE_SET_MAX V
Ö
200V drive: 230
400V drive: EUR> 400
USA> 460
575V drive: 575
690V drive: 690
Summary of Contents for Affinity
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