Motor Performance Fine-Tuning; Motor Performance Fine-Tuning; Fine-Tuning V/F Control And V/F Control With Pg - YASKAWA AC Drive-A1000 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.
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Fine-Tuning V/f Control and V/f Control with PG

Problem
Motor hunting and
Hunting Prevention Gain
oscillation at speeds
(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
• Poor motor torque at
Mid Output Voltage A
low speeds
(E1-08)
Minimum Output
• Motor instability at
Voltage (E1-10)
motor start
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)
<3> <4>
<1> Default setting value is dependent on parameter A1-02, Control Method Selection, and o2-04, Drive Model Selection.
<2> Default settings change after changing the control method (A1-02) or selecting a different V/f pattern (E1-03).
<3> ASR in V/f Control with PG only controls the output frequency, and does not allow the same high gain settings as CLV control.
<4> Refer to C5: Automatic Speed Regulator (ASR) on page 161
290
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
capacity (o2-04) and the duty 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 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 C710616 31B YASKAWA AC Drive – A1000 Technical Manual
Suggested
Default
Setting
1.00 0.10 to 2.00
1 (2 kHz) 1 to max. setting
<1>
100 to 1000 ms
200 ms
1.00 0.50 to 1.50
E1-08:
15.0 V
Default setting
E1-10:
±5 V
9.0 V
<2>
0.0
(no slip
0.5 to 1.5
compen-
sation)
Proportional
gain =
C5-01: 0.20
0.10 to 1.00
C5-02: 0.200
Integral time =
0.100 to 2.000