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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
Problem
• Motor hunting and
oscillation at speeds
between 10 and 40 Hz
• Motor noise
• Motor hunting and
oscillation at speeds up
to 40 Hz
• Poor motor torque at
speeds below 10 Hz
• Motor hunting and
oscillation
• Poor motor torque at
low speeds
• Motor instability at
motor start
• Poor speed precision
u
Motor Hunting and Oscillation Control Parameters
The following parameters indirectly affect motor hunting and oscillation.
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
Table 5.1 Parameters for Tuning the Drive
Parameter No.
• If insufficient motor torque relative to the
size of the load causes hunting, reduce the
setting.
Hunting
• When motor hunting and oscillation occur
Prevention Gain
with a light load, increase the setting.
(n1-02)
• 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.
• If the motor noise is too loud, increase the
carrier frequency.
Carrier
• When motor hunting and oscillation occur at
Frequency
speeds up to 40 Hz, lower the carrier
Selection
frequency.
(C6-02)
• The default setting for the carrier frequency
depends on the drive capacity (o2-04) and the
Drive Duty Selection (C6-01).
• If motor torque is insufficient at speeds
Torque
below 10 Hz, increase the setting.
Compensation
• If motor hunting and oscillation with a
Gain (C4-01)
relatively light load, decrease the setting.
• If torque is insufficient at speeds below 10
Mid Output
Hz, increase the setting.
Voltage A
• If motor instability occurs at motor start,
(E1-08)
decrease the setting.
Minimum
Note: The recommended setting value is for 200
Output Voltage
V class drives. Double this value when using a
(E1-10)
400 V class drive.
• After setting the motor-rated current (E2-01),
Slip
motor-rated slip (E2-02) and motor no-load
Compensation
current (E2-03), adjust the slip compensation
Gain (C3-01)
gain (C3-01).
5.2 Motor Performance Fine Tuning
Corrective Action
Default
Suggested
Value
Setting
1.00
0.10 to 2.00
7 (Swing
1 to 7
PWM)
1.00
0.50 to 1.50
E1-08:
16.0 V
Initial value
E1-10:
±5 V
12.0 V
-
0.5 to 1.5
121
5
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Troubleshooting
