YASKAWA FSDrive-MV1000 Series - Motor Performance Fine-Tuning

140 YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
5.2 Motor Performance Fine-Tuning
5.2 Motor Performance Fine-Tuning
This section offers helpful information for counteracting oscillation, hunting, or 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 parameters that are commonly edited and may be set incorrectly. Consult Yaskawa for more information
on detailed settings and fine-tuning the drive.
u Fine-Tuning V/f Control
Table 5.1 Parameters for Fine-Tuning Performance in V/f
u Fine-Tuning Open Loop Vector Control
Table 5.2 Parameters for Fine-Tuning Performance in OLV
Problem Parameter No. Corrective Action Default
Suggested
Setting
• Motor hunting and
oscillation at speeds
between 10 and 40 Hz
<1> Determined by o2-04 (Drive Model Selection)
Hunting Prevention
Gain Setting
(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
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 torque is insufficient at speeds below
10 Hz.
• Reduce the setting if motor hunting and oscillation occur 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
Frequency Voltage
(E1-08)
Minimum Output
Frequency Voltage
(E1-10)
• Increase the setting if torque is insufficient at speeds below
10 Hz.
• Reduce the setting if the motor instability occurs at motor
start.
E1-08:
<1>
E1-10: <1>
±3% of the
motor rated
voltage
Poor speed precision
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).
1.0 0.5 to 1.5
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
Speed Feedback
Detection Control
(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.
2.00 0.50 to 2.00
• Poor motor torque and
speed response
• Motor hunting and
oscillation at speeds
between 10 and 40Hz
Speed Feedback
Detection Control
(AFR) Time Constant
1 (n2-02)
• Gradually reduce the setting in 10 ms increments to improve
motor torque speed response.
• Gradually increase the setting in 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, accordingly.
250 ms
50 to
2000 ms