Emerson Unidrive HS72 Control Getting Started Manual page 42

6.2.5 RFC-S mode (Sensorless)
Permanent magnet motor without position feedback
Action
Ensure:
Before power- • The drive enable signal is not given (terminal 31).
up • Run signal is not given
• Motor is connected
Verify that RFC-S mode is displayed as the drive powers up. If the mode
is incorrect see section 4.7
Power-up the
page 19, otherwise restore parameter defaults (see section
drive
Restoring parameter defaults
4.9
Ensure that the drive displays 'inhibit'
Enter:
• Motor rated current in Pr 00.046 (A)+
Enter motor
Ensure that this equal to or less than the Heavy Duty rating of the
nameplate
drive otherwise 'Motor Too Hot' trips may occur during the autotune.
details
• Number of poles in Pr 00.042
• Motor rated voltage in Pr 00.044 (V)
Set maximum Enter:
speed • Maximum speed in Pr 00.002 (rpm)
Enter:
Set • Acceleration rate in Pr 00.003 (s/1000 rpm)
acceleration / • Deceleration rate in Pr 00.004 (s/1000 rpm) (If braking resistor
deceleration installed, set Pr 00.015 = Fast. Also ensure Pr 10.030, Pr 10.031
rates and Pr 10.061 are set correctly, otherwise premature 'Brake R Too
Hot' trips may be seen).
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.
Autotune
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 26 or 27).
• Close the drive enable signal (terminal 31). The upper row of the
display will flash 'Auto Tune' during 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
31) has been removed.
• Remove the drive enabled and run signal from the drive.
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
Check
motor. The ratio No-load Lq (Pr 00.056) / Ld (Pr 05.024) provides a
Saliency
measure of the saliency. If this value is > 1.1, then Non-salient mode
must be used (this is the default), otherwise Injection mode may be used.
Set Pr 00.054 for the selected mode: Injection (0) or Non-salient (1).
Select 'Save Parameters' in Pr mm.000 (alternatively enter a value of 1000
Save
in Pr mm.000) and press red
parameters
digital input.
Run Drive is now ready to run
42
Detail
Changing the operating mode
on page 20).
reset button or toggle the reset
Unidrive M702 / HS72 Control Getting Started Guide
on
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
Serial No: XXXXXXXXXXX
0.02
1000rpm
0.03
R
S
Ld
No-load Lq
Issue Number: 2
Brake: 12Nm
24V
0.67A
Control Techniques
Dynamics Ltd
ANDOVER, HANTS.
ENGLAND. SP10 5AB
t
t
0.04
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