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YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
6.2 Motor Performance Fine-Tuning
6.2 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 and V/f Control with PG
Table 6.1 Parameters for Fine-Tuning Performance in V/f and V/f w/PG
◆
Fine-Tuning Open Loop Vector Control
Table 6.2 Parameters for Fine-Tuning Performance in OLV
Problem
<1> Default setting value is dependent on parameter o2-04, Drive Model Selection.
<2> Setting range is 1 to 4 and F for models CIMR-U
2
0028 to 2
0248, 4
0011 to 4
0414.
Setting range is 0 and F for models CIMR-U
4
0477 to 4
0930.
<3> Default setting value is dependent on parameter A1-02, Control Method Selection, and o2-04, Drive Model Selection.
<4> Default settings change when the Control Method is changed (A1-02) or a different V/f pattern is selected using parameter E1-03.
<5> ASR in V/f Control with PG only controls the output frequency, and therefore does not allow the high gain settings possible when using Close
Loop Vector control.
<6> Refer to
C5: Automatic Speed Regulator (ASR) on page 222
for details on Automatic Speed Regulator (ASR).
Parameter No.
Corrective Action
Default
Suggested
Setting
Motor hunting and oscillation at speeds
between 10 and 40 Hz
Hunting Prevention Gain Setting
(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 Model
Selection (o2-04) and the Drive Duty Mode Selection (C6-01).
1 (4 kHz)
0 to 4, F
• Poor torque or speed response
• Motor hunting and oscillation
Torque Compensation Primary
Delay Time
(C4-02)
• If motor torque and speed response are too slow, decrease the setting.
• If motor hunting and oscillation occur, increase the setting.
200 ms
100 to 1000 ms
• 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
Middle Output Frequency
Voltage (E1-08)
Minimum Output Frequency
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.
E1-08: 15.0 V
E1-10: 9.0 V
Default setting
±5 V
Note:
The recommended setting value is for 200 V class drives. Double
this value when using a 400 V class drive.
Poor speed precision (V/f control)
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).
0.0
(no slip
compensation)
0.5 to 1.5
Poor speed precision (V/f control with
PG)
ASR Proportional Gain 1 (C5-01)
ASR Integral Time 1 (C5-02)
Adjust the ASR proportional gain 1 (C5-01) and the ASR integral time 1
(C5-02).
C5-01: 0.20
C5-02: 0.200 s
Proportional gain
= 0.10 to 1.00
Integral time
= 0.100 to 2.000 s
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)
• If motor torque and speed response are too slow, gradually decrease the
setting by 0.05.
• If motor hunting and oscillation occur, gradually increase the setting by
0.05.
1.00
0.50 to 2.00
• Poor motor torque and speed
response
• Motor hunting and oscillation at
speeds between 10 and 40 Hz
Speed Feedback Detection
Control (AFR) Time Constant 1
(n2-02)
• 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 inertia, gradually
increase the setting by 50 ms and check the performance.
Note:
When changing n2-02, set C4-02 (Torque Compensation Primary
Delay Time) accordingly.
50 ms
50 to 2000 ms
• Poor motor torque and speed
response
• Motor hunting and oscillation
Torque Compensation Primary
Delay Time (C4-02)
• To improve motor torque speed response, gradually reduce this setting by
2 ms and check the performance.
• If motor hunting and oscillation occur, gradually increase this setting by
10 ms.
Note:
Ensure that C4-02
≤
C4-06. When making adjustments to C4-02,
increase the Speed Feedback Detection Control (AFR) Time Constant1
(n2-02) proportionally.
20 ms
20 to 100 ms
Poor speed response and stability
Slip Compensation Primary
Delay Time (C3-02)
• If response is slow, gradually decrease the setting by 10 ms.
• If speed is unstable, gradually increase the setting by 10 ms.
200 ms
100 to 500 ms
Poor speed precision
Slip Compensation Gain (C3-01)
• If speed is too slow, gradually increase the setting by 0.1 ms.
• If speed is too fast, gradually decrease the setting by 0.1 ms.
1.0
0.5 to 1.5
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