IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 128
5.3.9 Hunting Prevention
Occasionally, in an application, resonance between the internal control system and the mechanical system causes
instability. This is called hunting, and may cause a crane to vibrate at a lower speed (up to 30 Hz) and/or with a light
load. The hunting prevention function monitors the motor flux and uses a special control circuit to “smooth out” any
peaks in the output current wave form.
Increase the set value of D11-02 when hunting is present while driving a light load. Decrease the set value of
D11-02 when the motor vibrates or stalls while driving a heavy load.
Table 5-53: Hunting Prevention Parameter Settings
Parameter Display Function Range Default
D11-01 Hunt Prev Select Hunt Prevention (V/f only) 0, 1 1
0 Disabled
1 Enabled
D11-02 Hunt Prev Gain Hunting Prevention Gain (V/f only) 0.00–2.50 1.00
D11-03 Hunt Prev Time Hunting Prevention Time Constant (V/f only) 0–500ms 10
D11-05 Rev Hunt Prev Gn Reverse Hunting Prevention Gain (V/f only) 0.00–2.50 0.00
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