40 Unidrive M702 / HS72 Control Getting Started Guide
Issue Number: 4
6.2.3 RFC-A mode (Sensorless control)
Induction motor with sensorless control
Action Detail
Before power-
up
Ensure:
• The drive enable signal is not given (terminal 31)
• 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 4.7 Changing the operating mode on page 21.
Ensure:
Drive displays ‘Inhibit’
Select RFC-A
(Sensorless
control) mode
•Set Pr03.024 = 1 or 3 to select RFC-A Sensorless mode
•Set Pr03.040 = 0000 to disable the wire break
Motor
Thermistor
Set-up
The motor thermistor connection may be made either:
Through the drive encoder port (terminal 15)
• Select thermistor type in P1 Thermistor Type (03.118)
•Set P1 Thermistor Fault Detection (
03.123
) to either Temperature (1) or
Temp or Short (2)
Through terminal 8 (Digital Input 5 / Analog Input 3) of the control terminals
(requires a drive with date code 1710 or later and control firmware
V01.13.00.00 or later).
• Change Analog Input 3 Mode (07.015) from Disable (0) to either Therm
Short Cct (7) or Thermistor (8).
• Select the thermistor type in Analog Input 3 Thermistor Type (07.046)
Enter motor
nameplate
details
• Motor rated frequency in Pr 00.047 (Hz)
• Motor rated current in Pr 00.046 (A)
• Motor rated speed in Pr 00.045 (rpm)
• Motor rated voltage in Pr 00.044 (V) - check if or connection
Set max
speed
Enter:
• Maximum frequency in Pr 00.002 (rpm)
Set accel. /
decel. rates
• Acceleration rate in Pr 00.003 (s /1000 rpm)
• Deceleration rate in Pr 00.004 (s /1000 rpm) (If braking resistor installed,
set Pr 00.015 = FAST. Also ensure Pr 10.030, Pr 10.031 and Pr 10.061
are set correctly).
Select or
deselect catch
a spinning
motor mode
If catch a spinning motor mode is not required then set Pr 06.009 to 0.
If catch a spinning motor mode is required then leave Pr 06.009 at the default
of 1, but depending on the size of the motor the value in Pr 05.040 may need
to be adjusted.
Pr 05.040 defines a scaling function used by the algorithm that detects the
speed of the motor. The default value of Pr 05.040 is 1 which is suitable for
small motors (< 4 kW). For larger motors the value in Pr 05.040 will need to be
increased.
Mot X XXXXXX XXX
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 1 445 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)
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