2.2 Motor Performance Fine-Tuning
This section offers helpful information for counteracting oscillation, hunting, and other problems that occur while performing
a trial run. Refer to the section below that corresponds to the motor control method used.
Note: This section describes commonly edited parameters that may be set incorrectly. Consult Yaskawa for more information on detailed settings
and for fine-tuning the drive.
u
Fine-Tuning V/f Control and V/f Control with PG
Table 2.1 Parameters for Fine-Tuning Performance in V/f and V/f w/PG
Problem Parameter No. Corrective Action Default
Suggested
Setting
Motor hunting and
oscillation at speeds
between 10 and 40 Hz
Hunting Prevention Gain
(n1-02)
• Reduce the setting if insufficient motor torque relative to the size
of the load causes hunting.
• Increase the setting when motor hunting and oscillation occur
with a light load.
• Reduce the setting if hunting occurs when using a motor with a
relatively low inductance, such as a high-frequency motor or a
motor with a larger frame size.
1.00 0.10 to 2.00
• Poor torque or speed
response
• Motor hunting and
oscillation
Torque Compensation
Primary Delay Time
(C4-02)
• Reduce the setting if motor torque and speed response are too
slow.
• Increase the setting if motor hunting and oscillation occur.
200 ms 100 to 1000 ms
• Poor motor torque at
speeds below 10 Hz
• Motor hunting and
oscillation
Torque Compensation
Gain (C4-01)
• Increase the setting if motor torque is insufficient at speeds
below 10 Hz.
• Reduce the setting if motor hunting and oscillation with a
relatively light load.
1.00 0.50 to 1.50
• Poor motor torque at
low speeds
• Motor instability at
motor start
Mid Output Voltage A
(E1-08)
Minimum Output
Voltage (E1-10)
• Increase the setting if motor torque is insufficient at speeds
below 10 Hz.
• Reduce the setting If motor instability occurs at motor start.
Depends on
o2-04, Drive
Model
Selection
Default setting
±5 V
Poor speed precision
(V/f control)
Slip Compensation Gain
(C3-01)
Set the motor-rated current (E2-01), motor-rated slip (E2-02), and
motor no-load current (E2-03), then adjust the slip compensation
gain (C3-01).
0.0
(no slip
compen-
sation)
0.5 to 1.5
Poor speed precision
(V/f control with PG)
ASR Proportional Gain 1
(C5-01)
ASR Integral Time 1
(C5-02)
<1>
<2>
Adjust the ASR proportional gain 1 (C5-01) and the ASR integral
time 1 (C5-02).
C5-01: 0.20
C5-02: 0.200
Proportional
gain =
0.10 to 1.00
Integral time =
0.100 to 2.000
<1> ASR in V/f Control with PG only controls the output frequency, and does not allow the same high gain settings as CLV control.
<2> Refer to C5: Automatic Speed Regulator (ASR) on page 53 for details on ASR.
u
Fine-Tuning Open Loop Vector Control
Table 2.2 Parameters for Fine-Tuning Performance in OLV
Problem Parameter No. Corrective Action Default
Suggested
Setting
• Poor motor torque
and speed response
• Motor hunting and
oscillation at speeds
between 10 and 40 Hz
AFR Gain
(n2-01)
• Gradually reduce the setting in 0.05 increments if motor torque
and speed response are too slow.
• Gradually increase the setting in 0.05 increments if motor hunting
and oscillation occur.
1.00 0.50 to 2.00
• Poor motor torque
and speed response
• Motor hunting and
oscillation at speeds
between 10 and 40 Hz
AFR Time Constant 1
(n2-02)
• Gradually reduce the setting in 10 ms increments and check the
performance to improve motor torque speed response.
• Gradually increase the setting by 50 ms increments and check the
performance if motor hunting and oscillation occur as a result of
load inertia.
Note:
Ensure that n2-02 ≤ n2-03. When changing n2-02, set
C4-02 (Torque Compensation Primary Delay Time
Constant 1) accordingly.
50 ms 50 to 2000 ms
2.2 Motor Performance Fine-Tuning
176
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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