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144 HVAC Drive H300
Issue Number: 3
7.3.2 RFC - A Sensorless
Induction motor without position feedback
Action Detail
Before power-up
Ensure:
• The drive enable signal is not given (terminal 29)
• Run signal is not given
• Motor is connected
Power-up the
drive
Verify that RFC-A mode is displayed as the drive powers up. If the mode is incorrect see section 5.6 Changing
the operating mode on page 116, otherwise restore parameter defaults (See section 5.8 Restoring parameter
defaults on page 117.
Ensure:
• Drive displays ‘Inhibit’
If the drive trips, see Chapter 13 Diagnostics on page 286.
Enter motor
nameplate
details
Enter:
• Motor rated frequency in Pr 00.021 (Hz)
• Motor rated current in Pr 00.020 (A)
• Motor rated speed in Pr 00.019 (rpm)
• Motor rated voltage in Pr 00.018 (V) - check if or connection
Set maximum
speed
Enter:
• Maximum speed in Pr 00.011 (rpm)
Set acceleration /
deceleration
rates
Enter:
• Acceleration rate in Pr 00.012 (s to Pr 1.006)
• Deceleration rate in Pr 00.013 (s from Pr 1.006)
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 00.024 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 and values relating to deadtime compensation from the drive. Measured values are used to
calculate the current loop gains, and at the end of the test the values in Pr 04.013 and Pr 04.014 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 05.010.
• A rotating autotune should only be used if the motor is uncoupled. 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 00.024 = 1 for a stationary autotune or set Pr 00.024 = 2 for a rotating autotune
• Close the drive enable signal (terminal 29). The drive will display ’Ready’ or ‘Inhibit’.
• Close the run signal (terminal 24). The lower display will flash ’Autotune’ while the drive is performing the
autotune.
• Wait for the drive to display ’Ready’ or ‘Inhibit’ and for the motor to come to a standstill.
If the drive trips, see Chapter 13 Diagnostics on page 286.
• Remove the drive enable and run signal from the drive.
Save parameters
Select 'Save Parameters' in Pr
mm.000
(alternatively enter a value of 1001 in Pr
mm.000
) and press red
reset button or toggle the reset digital input.
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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