5.2 Motor Performance Fine Tuning
This section offers helpful information for counteracting oscillation, hunting, or other faults
that occur while performing a trial run.
Note: This section describes parameters that are commonly edited. Consult Yaskawa for more information on
detailed settings and fine-tuning the drive.
u
Parameters for Tuning the Drive
Table 5.1 Parameters for Tuning the Drive
Problem Parameter No. Corrective Action
Default
Value
Suggested
Setting
• Motor hunting and
oscillation at speeds
between 10 and 40 Hz
Hunting
Prevention Gain
(n1-02)
• If insufficient motor torque relative to the
size of the load causes hunting, reduce the
setting.
• When motor hunting and oscillation occur
with a light load, increase the setting.
• Lower this 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
• Motor noise
• Motor hunting and
oscillation at speeds up
to 40 Hz
Carrier
Frequency
Selection
(C6-02)
• If the motor noise is too loud, increase the
carrier frequency.
• When motor hunting and oscillation occur at
speeds up to 40 Hz, lower the carrier
frequency.
•
The default setting for the carrier frequency
depends on the drive capacity (o2-04) and the
Drive Duty Selection (C6-01).
7 (Swing
PWM)
1 to 7
• Poor motor torque at
speeds below 10 Hz
• Motor hunting and
oscillation
Torque
Compensation
Gain (C4-01)
• If motor torque is insufficient at speeds
below 10 Hz, increase the setting.
• If motor hunting and oscillation with a
relatively light load, decrease the setting.
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)
• If torque is insufficient at speeds below 10
Hz, increase the setting.
• If motor instability occurs at motor start,
decrease the setting.
Note: The recommended setting value
is for 200
V class drives. Double this value when using a
400 V class drive.
E1-08:
16.0 V
E1-10:
12.0 V
Initial value
±5 V
• Poor speed precision
Slip
Compensation
Gain (C3-01)
• After setting the motor-rated current (E2-01),
motor-rated slip (E2-02) and motor no-load
current (E2-03), adjust the slip compensation
gain (C3-01).
- 0.5 to 1.5
u
Motor Hunting and Oscillation Control Parameters
The following parameters indirectly affect motor hunting and oscillation.
5.2 Motor Performance Fine Tuning
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
121
5
Troubleshooting
2/6/2008-14:44
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