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HVAC Drive H300 145
Issue Number: 3
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 116, otherwise restore parameter defaults (see Chapter 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 current in Pr 00.020 (A)
• Number of poles in Pr 00.017
• Motor rated voltage in Pr 00.018 (V)
Set maximum
speed
Enter:
• Maximum speed in Pr 00.002 (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 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 04.013 and Pr 04.014 are updated.
To perform an autotune:
•Set Pr 00.024 = 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 'Ready' or '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 286.
• Remove the drive enabled and run signal from the drive.
Check
Saliency
In sensorless mode, when the motor speed is below Pr 00.019 / 10, a special low speed algorithm must be used to
control the motor. There are three modes available, with the mode chosen based on the saliency of the motor.
The ratio No-load Lq (Pr 00.042) / Ld (Pr 05.024) provides a measure of the saliency. If this value is > 1.1,
then Injection (0) mode may be used. Current (2) mode may be used (but with limitations). If this value is <
1.1, then Current (2) mode must be used.
Set Pr 00.040 for the required mode: Injection (0), Non-salient (1), Current (2) or Current No Test (3).
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
Model No: 95UXXXXXXXXXXXX
Volts: 380/480
Cont: 7.7Nm:4.81Arms
Stall: 9.5Nm:5.91Arms
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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