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Unidrive SPM User Guide 129
Issue Number: 3 www.controltechniques.com
9.4.2 RFC mode
Software V01.10.00 or later should be used for RFC mode.
Induction motor
Action Detail
Before power-up
Ensure:
• Drive Enable signal is not given (terminal 31)
• Run signal is not given
• Motor and feedback device are connected
Power-up the
drive
Ensure:
• Drive displays ‘inh’
If the drive trips, see Chapter 15 Diagnostics on page 275.
Select RFC
mode and
disable encoder
wire-break trip
•Set Pr 3.24 = 1 or 3 to select RFC mode
•Set Pr 3.40 = 0
Enter motor
nameplate
details
Enter:
• Motor rated frequency in Pr 0.47 (Hz)
• Motor rated current in Pr 0.46 (A)
• Motor rated speed (base speed - slip speed) in Pr 0.45 (rpm)
• Motor rated voltage in Pr 0.44 (V) - check if or connection
Set maximum
speed
Enter:
• Maximum speed in Pr 0.02 (rpm)
Set acceleration /
deceleration
rates
Enter:
• Acceleration rate in Pr 0.03 (s/1000rpm)
• Deceleration rate in Pr 0.04 (s/1000rpm) (If braking resistor installed, set Pr 0.15 = FAST. Also ensure
Pr 10.30 and Pr 10.31 are set correctly, otherwise premature ‘It.br’ trips may be seen.)
Select or
deselect catch a
spinning motor
mode
If catch a spinning motor mode is not required then set Pr 6.09 to 0.
If catch a spinning motor mode is required then leave Pr 6.09 at the default of 1, but depending on the size of
the motor the value in Pr 5.40 may need to be adjusted.
Pr 5.40 defines a scaling function used by the algorithm that detects the speed of the motor. The default value
of Pr 5.40 is 1 which is suitable for small motors (<4kW). For larger motors the value in Pr 5.40 will need to be
increased. Approximate values of Pr 5.40 for different motor sizes are as follows, 2 for 11kW, 3 for 55kW and
5 for 150kW. If the value of Pr 5.40 is too large the motor may accelerate from standstill when the drive is
enabled. If the value of this parameter is too small the drive will detect the motor speed as zero even if the
motor is spinning.
Autotune
The drive is able to perform either a stationary or a rotating autotune. The motor must be at a standstill
before an autotune is enabled. 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.
It is highly recommended that a rotating autotune is performed (Pr 0.40 set to 2).
• A stationary autotune can be used when the motor is loaded and it is not possible to uncouple the load
from the motor shaft. The stationary autotune measures the stator resistance and transient inductance of
the motor. These are used to calculate the current loop gains, and at the end of the test the values in Pr
0.38 and Pr 0.39 are updated. A stationary autotune does not measure the power factor of the motor so
the value on the motor nameplate must be entered into Pr 0.43.
• A rotating autotune should only be used if the motor is un
coupled. A rotating autotune first performs a
stationary autotune before rotating the motor at
2
/
3
base speed in the direction selected. The rotating
autotune measures the stator inductance of the motor and calculates the power factor.
To perform an autotune:
•Set Pr 0.40 = 1 for a stationary autotune or set Pr 0.40 = 2 for a rotating autotune
• Close the Drive Enable signal (terminal 31). The drive will display ’rdY’.
• Close the run signal (terminal 26 or 27). The lower display will flash ’Auto’ and ’tunE’ alternatively,
while the drive is performing the autotune.
• Wait for the drive to display ‘rdY’ or ‘inh’ and for the motor to come to a standstill
If the drive trips, see Chapter 15 Diagnostics on page 275.
Remove the drive enable and run signal from the drive.
Save parameters
Enter 1000 in Pr xx.00
Press the red reset button or toggle the reset digital input (ensure Pr xx.00 returns to 0)
Run Drive is now ready to run
Mot X XXXXXXXXX
No XXXXXXXXXX kg
IP55 I.cl F C 40 s S1
°
VHzmin
-1
kW cos
φ
A
230
400
50 1445 2.20 0.80 8.50
4.90
CN = 14.5Nm
240
415
50 1445 2.20 0.76 8.50
4.90
CN = 14.4Nm
CTP- VEN 1PHASE 1=0,46A P=110W R.F 32MN
I.E.C 34 1(87)
A rotating autotune will cause the motor to accelerate up to
2
/
3
base speed in the direction
selected regardless of the reference provided. Once complete the motor will coast to a stop.
The enable signal must be removed before the drive can be made to run at the required
reference.
The drive can be stopped at any time by removing the run signal or removing the drive enable.
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