MX2 Quick Start Guide
18 MX2 Quick Start Guide
At this point the inverter is ready to run the motor for the first time, but first review this check-list:
• Verify the power LED is ON. If not, check the power connections.
• Verify the PRG LED is OFF. If it is ON, review the instructions above.
• Make sure the motor is disconnected from any mechanical load.
• Make sure that you have a frequency reference checking the content of F001 and the Hz Led on operator
• Now give the RUN command from the selected source. The RUN LED will turn ON.
• The motor should start turning.
• Remove the RUN command or press the STOP key to stop the motor rotation.
3.6 Auto tuning (SLV Mode)
The MX2 inverter has auto-tuning function to get suitable motor control performance by measuring the motor constants auto-
matically. Auto-tuning is effective only for sensorless vector control. Basically two modes are available the static and the rotative
one:
• Static is less accurate but it could be used in situations where motor rotation could damage the mechanics. For this mode nei-
ther the I0 (no-load current) or the J (inertia) are calculated.
• Rotative auto-tuning moves the motor following a special operation pattern to find the motor characteristics. However, the
torque during auto-tuning is not sufficient so is recommended to detach the mechanical system and don’t use for example
with vertical loads.
The Auto-tuning mode is selected by parameter H001 and after it finish succefully is necessary to to select the auto-tuning
parameters by parameter H002.
For a correct auto-tuning calculation please take into account following recommendations before starting:
• Use only a motor of the same size or one size lower than the inverter.
• Be sure to disable the DC braking setting (A051=00)
• Be sure to deactivate ATR digital input (52: Enable torque cmd. input)
• Motor rotates up to 80% of base frequency, check if it’s a problem for the application.
• Motor should not be driven by any other external force.
• All the brakes should be released
• Be sure that physical limtis of the machine will not be reach
• Even for none-rotative auto-tuning there is a risk that motor moves slightly
After checking the above points and setting parameter H001 procced with the activation of the Run command from the source
selected on A002 and the auto-tuning will start. Please check the diagram on next page for detailed information of all the steps.
After the tuning the H001 returns to “00” status and the motor characteristics are transferred to those parameter, remember to
set H002 to use them.
Note: In case rotary tuning is not possible or autotuning results in very high No Load current (H033) (this is possible with small
motors), please use this formula to calculate theoretical value:
H033 = Inom * sin (arccos(cos phi)).
Parameter Parameter Name Description
H001 Auto-tuning selection
00: Disable
01: Enabled with motor stop
02: Enabled with motor rotation
H002 Motor constant selection
00: Standard motor
02: Auto tuned data
Parameter Parameter Name Description
H030 Motor constant R1 0.001 to 65.535 Ohms
H031 Motor constant R2 0.001 to 65.535 Ohms
H032 Motor constant L 0.01 to 655.35 mH
H033 Motor constant I0 0.01 to 655.35 A
H034 Motor constant J 0.001 to 9999 kgm2
I129E-EN-02+MX2+QuickStartGuide.book Seite 18 Mittwoch, 7. November 2012 1:54 13
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