Motor Performance Fine-Tuning; Motor Performance Fine-Tuning; Fine-Tuning V/F Control And V/F Control With Pg; Fine-Tuning Open Loop Vector Control - YASKAWA A1000 HHP Programming Manual

2.2 Motor Performance Fine-Tuning

2.2

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
• 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)
<1> <2>
<1> ASR in V/f Control with PG only controls the output frequency, and does not allow the same high gain settings as CLV control.
<2> Refer to C5: Automatic Speed Regulator (ASR) on page 53
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Fine-Tuning Open Loop Vector Control

Problem Parameter No.
• Poor motor torque
and speed response
AFR Gain
• Motor hunting and
(n2-01)
oscillation at speeds
between 10 and 40 Hz
• Poor motor torque
and speed response
AFR Time Constant 1
• Motor hunting and
(n2-02)
oscillation at speeds
between 10 and 40 Hz
176
Table 2.1 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.
• 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).
Table 2.2 Parameters for Fine-Tuning Performance in OLV
• Gradually reduce the setting in 0.05 increments if motor torque
and speed response are too slow.
• Gradually increase the setting in 0.05 increments if motor hunting
and oscillation occur.
• Gradually reduce the setting in 10 ms increments and check the
performance to improve motor torque speed response.
• Gradually increase the setting by 50 ms increments and check the
performance if motor hunting and oscillation occur as a result of
load inertia.
Note:
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
Corrective Action
for details on ASR.
Corrective Action
Ensure that n2-02 ≤ n2-03. When changing n2-02, set
C4-02 (Torque Compensation Primary Delay Time
Constant 1) accordingly.
Suggested
Default
Setting
1.00 0.10 to 2.00
200 ms 100 to 1000 ms
1.00 0.50 to 1.50
Depends on
o2-04, Drive Default setting
Model ±5 V
Selection
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
Suggested
Default
Setting
1.00 0.50 to 2.00
50 ms 50 to 2000 ms