8
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Procedure for Changing Constants through Communications
For 400-V class Inverters of 55 kW to 300 kW, take safety measures such as the installation of an emergency-
stop switch before adjusting constants. Failure to do so may result in injury caused by the motor accidentally
rotating during stationary autotuning performed by the Inverter when the constants are adjusted.
After replacing the control board, write in all of the constants to the new board with MEMOBUS communica-
tions or a Communications Option Board.
Next, be sure to perform autotuning to make adjustments after shipping.
Step No.
Digital Operator Display
Description
1
Set o2-04 (kVA selection) to the capacity of the Inverter that you use.
2
Set A1-02 to the control method to be used. The value of the control method
should be set to the same value as when the constants were copied from the
Inverter to the Digital Operator.
3
Set A1-03 (Initialize) to 2220 (2-wire initialization) or 3330 (3-wire initializa-
tion).
This example is a typical setting for initialization by a 2-wire sequence.
4
If the mode is switched to the DRIVE after initialization has been completed,
the motor power setting display appears. Set T1-02 (Motor output power) to
the motor capacity of the connected motor.
This example is the setting for a 55 kW motor.
5
Press the Increment Key to view the shipping adjustment display. After con-
firming that the motor has been connected, press the RUN Key to start auto-
tuning.
Note: Do not touch the motor terminals. Although the motor does not rotate,
voltage is being supplied to the motor though the motor is not rotating.
6
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After autotuning has been completed, use the copy function of the Operator to
copy the settings of the constants of the control board from the Operator to the
Inverter before replacing the board.
If the copy function is not available, change the setting of the constants manu-
ally.
7
If the mode is switched to the DRIVE, the frequency setting display appears,
and the operation becomes enabled.
Step No.
Digital Operator Display
Description
1
Set T1-01 (Autotuning mode selection) to 3 (Shipping adjustment).
2
Press the Increment Key to view the motor rated power display. Set T1-02
(Motor output power) to the capacity of the connected motor.
3
Press the Increment Key to view the motor rated current display. Set T1-04
(Motor rated current) to the value of motor rated current.
4
Press the Increment Key to view the shipping adjustment display.
After confirming that the motor has been connected, press the RUN Key to
start autotuning.
Note: Do not touch the motor terminals. Although the motor does not rotate,
voltage is being supplied to the motor though the motor is not rotating.