Motor Performance Fine-Tuning; Motor Performance Fine-Tuning; Fine-Tuning V/F Control; Fine-Tuning Open Loop Vector Control - YASKAWA FSDrive-MV1000 Instructions 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.

◆ Fine-Tuning V/f Control

Problem
• Motor hunting and
Hunting Prevention
oscillation at speeds
Gain Setting(n1-02)
between 10 and 40 Hz
• Poor torque or speed
response
• Motor hunting and
Primary Delay Time
oscillation
• Poor motor torque at
speeds below 10 Hz
Compensation Gain
• Motor hunting and
oscillation
• Poor motor torque at low
speeds
• Motor instability at
motor start
Slip Compensation
• Poor speed precision
<1> Determined by o2-04 (Drive Model Selection)

◆ 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
110
Table 5.1 Parameters for Fine-Tuning Performance in V/f
Parameter No.
• 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 larger frame size, or a motor with relatively low
inductance.
Torque
• If motor torque and speed response are too slow, decrease
Compensation
the setting.
• If motor hunting and oscillation occur, increase the setting.
(C4-02)
• If torque is insufficient at speeds below 10 Hz, increase the
Torque
setting.
• If motor hunting and oscillation with a relatively light
(C4-01)
load, decrease the setting.
Mid Output
Frequency Voltage • If torque is insufficient at speeds below 10 Hz, increase the
(E1-08) setting.
Minimum Output • If the motor exhibits excessive instability at start-up,
Frequency Voltage reduce the setting.
(E1-10)
• After setting the motor-rated current (E2-01), motor-rated
Gain slip (E2-02), and motor no-load current (E2-03), adjust the
(C3-01) slip compensation gain (C3-01).
Table 5.2 Parameters for Fine-Tuning Performance in OLV
Parameter No.
• If motor torque and speed response are too slow, gradually
Speed Feedback
decrease the setting by 0.05.
Detection Control
• If motor hunting and oscillation occur, gradually increase
(AFR) Gain(n2-01)
the setting by 0.05.
• To improve motor torque speed response, gradually reduce
this setting by 10 ms and check the performance.
• If motor hunting and oscillation occur as a result of load
Speed Feedback
inertia, gradually increase the setting by 50 ms and check
Detection Control
the performance.
(AFR) Time Constant
Note: Ensure that n2-02 ≤ n2-03.When
1(n2-02)
Corrective Action
Corrective Action
changing n2-02, set C4-02 (Torque
Compensation Primary Delay Time)
accordingly.
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
Suggested
Default
Setting
1.00 0.10 to 2.00
100 to 1000
200 ms
ms
1.00 0.50 to 1.50
±3% of the
E1-08:
<1>
motor rated
E1-10:
<1>
voltage
0.0 (no slip
0.5 to 1.5
compensation)
Suggested
Default
Setting
1.00 0.50 to 2.00
50 to 2000
250 ms
ms