IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 65
4.4.1 Standard Auto-Tune (T01-01 = 0)
This is a rotational Auto-Tuning method for the IMPULSE
®
•VG+ Series 4 VFD which allows for Auto-Tuning on an
unloaded or decoupled motor.
This method requires that the motor be unloaded or decoupled from the load with the brake disengaged.
The instructions below will provide a step-by-step procedure to complete the non-rotational segment of this Auto-
Tune function:
1. In preparation for the Auto-Tune, the crane should be unloaded with minimal attachments. This Auto-Tuning
method requires free rotation of the unloaded motor, so decoupling the motor from the load may be necessary.
2. Ensure the brake is not set during the Auto-Tuning process.
3. Using the keypad, browse to the “Auto-Tuning” menu.
4. Choose “Standard Tuning” (T01-01 = 0) for the Tuning Mode.
5. Enter the nameplate motor characteristics (T01-02 – T01-08) until the “Tuning Ready?” screen is reached.
6. Press the green “RUN” key to start the Auto-Tune. It will take up to a few minutes to complete. During this time,
the current will ramp up and down and a high pitched frequency may be audible coming from the motor; this is
normal. The motor will then begin a rotational cycle, which will complete in one minute or less.
7. When the Auto-Tune has completed, the keypad display will display an “End Tune Successful” message.
Press the “ESC” key twice to exit.
NOTE: If the STOP key is depressed during tuning, auto-tuning is interrupted and the motor coasts to a stop. The
data changed during tuning returns to its original values.
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