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Powerdrive F300 User Guide 141
Issue Number: 2
7.3.3 RFC-S Sensorless
Permanent magnet 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-S mode is displayed as the drive powers up. If the mode is incorrect see Chapter
5.6 Changing the operating mode on page 108, otherwise restore parameter defaults (see Chapter
5.8 Restoring parameter defaults on page 109).
Ensure:
• Drive displays ‘inhibit’
If the drive trips, see Chapter 13 Diagnostics on page 260.
Enter motor
nameplate
details
Enter:
• Motor rated current in Pr 00.046 (A)
• Number of poles in Pr 00.042
• Motor rated voltage in Pr 00.044 (V)
Set
maximum
speed
Enter:
• Maximum speed in Pr 00.002 (rpm)
Set
acceleration /
deceleration
rates
Enter:
• Acceleration rate in Pr 00.003 (s to Pr 01.006)
• Deceleration rate in Pr 00.004
Autotune
The drive is able to perform a stationary autotune. The motor must be at a standstill before an autotune is
enabled. A stationary autotune will give moderate performance.
• A stationary autotune is performed to locate the flux axis of the motor. The stationary autotune measures
the stator resistance, inductance in flux axis, inductance in torque axis with no load on 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 00.038 and Pr 00.039 are updated.
To perform an autotune:
•Set Pr 00.040 = 1 or 2 for a stationary autotune. (Both perform the same tests).
• Close the run signal (terminal 24).
• Close the drive enable signal (terminal 29). The upper row of the display will flash 'Auto Tune' while the
drive is performing the test.
• Wait for the drive to display 'Inhibit'.
If the drive trips it cannot be reset until the drive enable signal (terminal 29) has been removed. See Chapter
13 Diagnostics on page 260.
• Remove the drive enabled and run signal from the drive.
Check
Saliency
In sensorless mode, when the motor speed is below Pr 00.045 / 10, a special low speed algorithm must be
used to control the motor. There are two modes available, with the mode chosen based on the saliency of the
motor.
The ratio No-load Lq (Pr 00.056) / Ld (Pr 05.024) provides a measure of the saliency. If this value is > 1.1,
then injection (0) mode may be used (this is the default). Non-salient (1) mode may be used (but with
limitations). If this value is < 1.1, then Non-salient (1) mode must be used.
Set Pr
00.054 for the selected mode: Injection (0) or Non-salient (1).
Save
parameters
Select 'Save Parameters' in Pr
mm.000
(alternatively enter a value of 1000 in Pr
mm.000
) and press red
reset button or toggle the reset digital input.
Run Drive is now ready to run
Model No: 95UXXXXXXXXXXXX
Volts: 380/480
Cont: 7.7Nm:4. 81Arms
Stall: 9.5Nm:5.91Ar ms
Speed: 3000rpm Poles:6
Kt: 1.6Nm/Arms
Ins Class: H
Brake: 12Nm
24V
0.67A
Serial No: XXXXXXXXXXX
Control Techniques
Dynamics Ltd
ANDOVER, HANTS.
ENGLAND. SP10 5AB
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