4.11 Fine Tuning during Test Runs (Adjust the Control Function)
152 YASKAWA SIEPC71061753C GA500 Technical Manual
4.11 Fine Tuning during Test Runs (Adjust the Control
Function)
This section gives information about the adjustment procedures to stop hunting or oscillation errors caused by the
control function during a test run. Adjust the applicable parameters as specified by your control method and drive
status.
• V/f Control on page 152
• Open Loop Vector Control for PM Motors on page 155
• Advanced Open Loop Vector Control Method for PM Motors on page 156
• EZ Open Loop Vector Control Method on page 156
Note:
This section only lists frequently adjusted parameters. If you must adjust parameters that have a higher degree of precision, contact
Yaskawa.
◆ V/f Control
Table 4.18 Parameters for Fine Tuning the Drive (A1-02 = 0 [V/f])
Issue Parameter Number Possible Solutions Default Recommended Setting
Hunting or oscillation at mid-
range speeds (10 Hz to 40 Hz)
n1-02 [Hunting Prevention Gain
Setting]
• If torque is not sufficient with
heavy loads, decrease the
setting value.
• If hunting or oscillation occur
with light loads, increase the
setting value.
• If hunting occurs with a low-
inductance motor, for example
a motor with a larger frame
size or a high-frequency
motor, lower the setting value.
Set n1-01 = 1 [Hunting
Prevention Selection =
Enabled].
1.00 0.10 - 2.00
• The volume of the motor
excitation sound is too high.
• Hunting or oscillation at low
speeds (10 Hz or lower), or at
mid-range speeds (10 Hz to 40
Hz)
C6-02 [Carrier Frequency
Selection]
• If the volume of the motor
excitation sound is too high,
increase the carrier frequency.
• If hunting or oscillation occur
at low or mid-range speeds,
decrease the carrier frequency.
1 (2 kHz)
*1
1 to upper limit value
• Unsatisfactory motor torque
and speed response
• Hunting or oscillation
C4-02 [Torque Compensation
Delay Time]
• If torque or speed response are
slow, decrease the setting
value.
• If hunting or oscillation occur,
increase the setting value.
200 ms
*2
100 ms to 1000 ms
• Torque at low speeds (10 Hz
or lower) is not sufficient.
• Hunting or oscillation
C4-01 [Torque Compensation
Gain]
• If torque at low speeds (10 Hz
or lower) is not sufficient,
increase the setting value.
• If hunting or oscillation occur
with light loads, decrease the
setting value.
1.00 0.50 - 1.50
• If you use the drive with an
IE3 high efficiency motor, the
current that is more than the
motor rated current will flow
and trip at overload. Hunting
or oscillation.
C4-01 [Torque Compensation
Gain]
Decrease the setting value in
these conditions:
• Drive trips at overload.
• Hunting or oscillation.
1.00 0.00 - 1.00
• Torque at low speeds (10 Hz
or lower) is not sufficient.
• Large initial vibration at start
up.
• E1-08 [Mid Point AVoltage]
• E1-10 [Minimum Output
Voltage]
• If torque at low speeds (10 Hz
or lower) is not sufficient,
increase the setting value.
• If there is large initial
vibration at start up, decrease
the setting value
• E1-08: 16.0 V
*3
• E1-10: 12.0 V
*3
Default setting +/- 5 V
*4
Speed precision is unsatisfactory. C3-01 [Slip Compensation Gain]
Set E2-01 [Motor Rated Current],
E2-02 [Motor Rated Slip], and
E2-03 [Motor No-Load Current],
then adjust C3-01.
0.0 (no slip compensation) 0.5 - 1.5
*1 The default setting changes when the settings for C6-01 [Normal / Heavy Duty Selection] and o2-04 [Drive Model (KVA) Selection]
change.
*2 The default setting changes when the settings for A1-02 [Control Method Selection] and o2-04 change.
*3 The default setting changes when the settings for A1-02 and E1-03 [V/f Pattern Selection] change.
*4 Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.
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