C7 Hunting Prevention - YASKAWA VS-616G5 Series Programming Manual

C6-03 Carrier Proportional Gain
Setting Range:
Factory Default:
C6-01
Carrier
Frequency
C6-02
Note: An OPE11 fault occurs if either of the following conditions is present:
1. C6-03 > 6kHz and C6-02 > C6-01
2. C6-01 > 5kHz and C6-02 ≤ 5kHz
C7 Hunting Prevention
Occasionally, in an application, resonance between the internal control system and the mechanical sys-
tem causes current instability. This instability is called hunting, and may cause the machine to vibrate
at lower speeds (up to 30Hz). The hunting prevention function monitors the motor flux and uses a spe-
cial control circuit to "smooth out" any peaks in the output current waveform.
C7-01 Hunting Prevention Selection
Enables the hunting prevention function in V/f control mode.
C7-02 Hunting Prevention Gain
Setting Range:
Factory Default:
Sets hunting prevention gain in units of 0.01. When hunting is present while driving a light load,
increase the set value in one tenth (0.1) increments. When the motor vibrates or stalls while driving a
heavy load, decrease the set value.
VS-616G5 Programming Manual
0 to 99
0
Fout × C6-03 × K*
Fout
Output Frequency
Figure 23 Carrier Frequency Setting
Setting
0 Hunting prevention is disabled.
1 Hunting prevention is enabled (factory default).
0.00 to 2.50
1.00
CarrierFreq Gain
* K varies depending on the carrier frequency upper limit (C6-01):
C6-01 > 10.0kHz
10.0kHz > C6-01 > 5.0kHz
C6-01 < 5.0kHz
Hunt Prev Select
Description
Hunt Prev Gain
Section C: Tuning Parameters

C7 Hunting Prevention

Open Loop Flux
V/f V/f w/PG
Vector Vector
A A - -
K = 3
K = 2
K = 1
− −
A A
− −
A A
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