Motor Performance Fine-Tuning; Motor Performance Fine-Tuning; Fine-Tuning V/F Control And V/F Control With Pg - 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, and 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 commonly edited parameters that may be set incorrectly. Consult Yaskawa for more information on detailed settings
and for fine-tuning the drive.
u

Fine-Tuning V/f Control and V/f Control with PG

Problem
Motor hunting and
Hunting Prevention
oscillation at speeds
Gain Setting (n1-02)
between 10 and 40 Hz
• Motor noise
Carrier Frequency
• Motor hunting and
Selection (C6-02)
oscillation at speeds
up to 40 Hz
• Poor torque or speed
Torque Compensation
response
Primary Delay Time
• Motor hunting and
(C4-02)
oscillation
• Poor motor torque at
speeds below 10 Hz
Torque Compensation
Gain (C4-01)
• Motor hunting and
oscillation
Middle Output
• Poor motor torque at
Frequency Voltage
low speeds
(E1-08)
Minimum Output
• Motor instability at
Frequency Voltage
motor start
(E1-10)
Poor speed precision Slip Compensation Gain
(V/f control) (C3-01)
ASR Proportional Gain
1 (C5-01)
Poor speed precision
ASR Integral Time 1
(V/f control with PG)
(C5-02)
<5> <6>
<1> Default setting value is dependent on parameter o2-04, Drive Model Selection.
<2> Setting range is 1 to 4 and F for models 2o0028 to 2o0248, 4o0011 to 4o0414.
Setting range is 0 and F for models 4o0477 to 4o0930.
<3> Default setting value is dependent on parameter A1-02, Control Method Selection, and o2-04, Drive Model Selection.
<4> Changing the control method in A1-02 or selecting a different V/f pattern in E1-03 will change the default setting.
<5> ASR in V/f Control with PG only controls the output frequency, and does not allow the same high gain settings as CLV control.
<6> Refer to C5: Automatic Speed Regulator (ASR) on page 228
356
Table 6.1 Parameters for Fine-Tuning Performance in V/f and V/f w/PG
Parameter No.
• 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 a relatively low inductance, such as a high-
frequency motor or a motor with a larger frame size.
• Increase the carrier frequency If the motor noise is too
loud.
• Lower the carrier frequency when motor hunting and
oscillation occur at speeds up to 40 Hz.
• The default setting for the carrier frequency depends
on the drive model selection (o2-04) and the drive duty
mode selection (C6-01).
• Reduce the setting if motor torque and speed response
are too slow.
• Increase the setting if motor hunting and oscillation
occur.
• Increase the setting if motor torque is insufficient at
speeds below 10 Hz.
• Reduce the setting if motor hunting and oscillation
with a relatively light load.
• Increase the setting if motor torque is insufficient at
speeds below 10 Hz.
• Reduce the setting If motor instability occurs at motor
start.
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).
Adjust the ASR proportional gain 1 (C5-01) and the ASR
integral time 1 (C5-02).
Corrective Action
for details on ASR.
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Suggested
Default
Setting
1.00 0.10 to 2.00
<1>
1 (4 kHz) 0 to 4, F
<3>
100 to 1000 ms
200 ms
1.00 0.50 to 1.50
E1-08: 15.0 V
Default setting
E1-10: 9.0 V
±5 V
<4>
0.0
(no slip compen- 0.5 to 1.5
sation)
Proportional gain
C5-01: 0.20 = 0.10 to 1.00
C5-02: 0.200 s Integral time =
0.100 to 2.000 s
<2>