Motor Performance Fine-Tuning; Motor Performance Fine-Tuning; Fine-Tuning V/F Control; Fine-Tuning Open Loop Vector Control - YASKAWA FSDrive-MV1000 Series Instructions For Use Manual

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
Problem
• Motor hunting and
oscillation at speeds
between 10 and 40 Hz
• Poor torque or speed
response
• Motor hunting and
oscillation
• 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
<1> Determined by o2-04 (Drive Model Selection)
u Fine-Tuning Open Loop Vector Control
Problem
• Poor motor torque and
speed response
• Motor hunting and
oscillation at speeds
between 10 and 40 Hz
• Poor motor torque and
speed response
• Motor hunting and
oscillation at speeds
between 10 and 40Hz
140
Table 5.1 Parameters for Fine-Tuning Performance in V/f
Parameter No.
• Reduce the setting if insufficient motor torque relative to the
size of the load causes hunting,
Hunting Prevention
• Increase the setting when motor hunting and oscillation occur
with a light load.
Gain Setting
• Reduce the setting if hunting occurs when using a motor with
(n1-02)
relatively low inductance, such as a high-frequency motor or a
motor with a larger frame size.
Torque
• Reduce the setting if motor torque and speed response are too
Compensation
slow.
Primary Delay Time
• Increase the setting if motor hunting and oscillation occur.
(C4-02)
• Increase the setting if torque is insufficient at speeds below
Torque
10 Hz.
Compensation Gain
• Reduce the setting if motor hunting and oscillation occur with
(C4-01)
a relatively light load.
Mid Output
Frequency Voltage • Increase the setting if torque is insufficient at speeds below
(E1-08) 10 Hz.
Minimum Output • Reduce the setting if the motor instability occurs at motor
Frequency Voltage start.
(E1-10)
Slip Compensation Set the motor rated current (E2-01), motor-rated slip
Gain (E2-02), and motor no-load current (E2-03), then adjust the
(C3-01) slip compensation gain (C3-01).
Table 5.2 Parameters for Fine-Tuning Performance in OLV
Parameter No.
• Gradually reduce the setting in 0.05 increments if motor
Speed Feedback
torque and speed response are too slow.
Detection Control
• Gradually increase the setting in 0.05 increments if motor
(AFR) Gain (n2-01)
hunting and oscillation occur.
• Gradually reduce the setting in 10 ms increments to improve
motor torque speed response.
Speed Feedback
• Gradually increase the setting in 50 ms increments and check
Detection Control
the performance if motor hunting and oscillation occur as a
(AFR) Time Constant
result of load inertia.
Note: Ensure that n2-02 ≤ n2-03. When changing
1 (n2-02)
Corrective Action
Corrective Action
n2-02, set C4-02, Torque Compensation
Primary Delay Time, accordingly.
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
Suggested
Default
Setting
1.00 0.10 to 2.00
100 to
200 ms
1000 ms
1.00 0.50 to 1.50
±3% of the
E1-08:
<1>
motor rated
E1-10:
<1>
voltage
1.0 0.5 to 1.5
Suggested
Default
Setting
2.00 0.50 to 2.00
50 to
250 ms
2000 ms