Fine Tuning During Test Runs (Adjustment Of Control Functionality); V/F Control And Closed Loop V/F Control - YASKAWA GA700 Technical Manual

3.10 Fine Tuning during Test Runs (Adjustment of Control
Functionality)
The following explains the adjustment procedures to follow when issues such as hunting or oscillation attributable
to control functionality occur during a test run. Adjust the relevant parameters appearing in the chart, in
accordance with the control method being used and the drive's status.
Note:
In this section, only the parameters that are frequently adjusted are listed. Please consult with a Yaskawa representative if adjustments
having a higher degree of precision are required.
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V/f Control and Closed Loop V/f Control

Table 3.16 Parameters for Fine Tuning the Drive (V/f Control and Closed Loop V/f Control Methods)
Issue
Hunting, oscillation at
n1-02 [Hunting
middle-range speeds (10
Prevention Gain Setting]
Hz to 40 Hz)
• The motor excitation
sound is significant.
• Hunting, oscillation at
C6-02 [Carrier Frequency
low speeds (10 Hz or
Selection]
lower), or at middle-
range speeds (10 Hz to
40 Hz)
• Torque, speed response
C4-02 [Torque
is slow.
Compensation Delay
Time]
• Hunting, oscillation
• Insufficient torque at
low speeds (10 Hz or
C4-01 [Torque
lower).
Compensation Gain]
• Hunting, oscillation
• Insufficient torque at
• E1-08 [Mid Point A
low speeds (10 Hz or
lower).
• E1-10 [Minimum
• Significant shock upon
startup.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual

3.10 Fine Tuning during Test Runs (Adjustment of Control Functionality)

Parameter Number
• Reduce setting value
when torque is
insufficient with heavy
loads.
• If hunting, oscillation
occurs with light loads,
increase the setting
value.
• If hunting occurs with a
low-inductance motor,
such as a motor with a
larger frame size or a
high-frequency motor,
lower the setting value.
• Raise the carrier
frequency if the motor
excitation sound is
significant.
• Lower the carrier
frequency if hunting or
oscillation occurs at
low or middle-range
speeds.
• Reduce setting value
when torque, speed
response is slow.
• If hunting, oscillation
occurs, increase the
setting value.
• Increase setting value
when torque is
insufficient at low
speeds.
• If hunting, oscillation
occurs with light loads,
reduce the setting
value.
• Increase setting value
when torque is
insufficient at low
Voltage]
speeds.
• Reduce setting value if
Output Voltage]
there is marked shock
upon drive startup.
Solution Default Setting
1.00
1(2 kHz)
*1
200 ms
*2
1.00
• E1-08: 15.0 V
• E1-10: 9.0 V
Suggested Setting
0.10 - 2.00
1 to upper limit value
100 - 1000 ms
0.50 - 1.50
*3
Default setting +/- 5 V
*3
3
*4
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