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3.7
Fine Tuning during Test Runs (Adjust the Control
Function)
This section gives information about the adjustment procedures to stop hunting or oscillation errors caused by the
control function during a test run. Adjust the applicable parameters as specified by your control method and drive
status.
•
V/f Control on page 481
•
Open Loop Vector Control for PM Motors on page 484
•
Advanced Open Loop Vector Control Method for PM Motors on page 485
•
EZ Open Loop Vector Control Method on page 485
Note:
This section only lists frequently adjusted parameters. If you must adjust parameters that have a higher degree of precision, contact Yaskawa.
◆
V/f Control
Issue
Hunting or oscillation at mid-range
n1-02 [Hunting Prevention Gain
speeds (10 Hz to 40 Hz)
Setting]
• The volume of the motor
excitation sound is too high.
C6-02 [Carrier Frequency
• Hunting or oscillation at low
Selection]
speeds (10 Hz or lower), or at
mid-range speeds (10 Hz to 40
Hz)
• Unsatisfactory motor torque
C4-02 [Torque Compensation
and speed response
Delay Time]
• Hunting or oscillation
• Torque at low speeds (10 Hz or
C4-01 [Torque Compensation
lower) is not sufficient.
Gain]
• Hunting or oscillation
• If you use the drive with an IE3
high efficiency motor, the
current that is more than the
C4-01 [Torque Compensation
motor rated current will flow
Gain]
and trip at overload. Hunting or
oscillation.
• Torque at low speeds (10 Hz or
• E1-08 [Mid Point A Voltage]
lower) is not sufficient.
• E1-10 [Minimum Output
• Large initial vibration at start
up.
Speed precision is unsatisfactory.
C3-01 [Slip Compensation Gain]
*1
The default setting changes when the settings for C6-01 [Normal / Heavy Duty Selection] and o2-04 [Drive Model (KVA) Selection]
change.
*2
The default setting changes when the settings for A1-02 [Control Method Selection] and o2-04 change.
*3
The default setting changes when the settings for A1-02 and E1-03 [V/f Pattern Selection] change.
*4
Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.
YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING
3.7 Fine Tuning during Test Runs (Adjust the Control Function)
Table 3.15 Parameters for Fine Tuning the Drive (A1-02 = 0 [V/f])
Parameter Number
Possible Solutions
• If torque is not sufficient with
heavy loads, decrease the
setting value.
• If hunting or oscillation occur
with light loads, increase the
setting value.
• If hunting occurs with a low-
inductance motor, for example a
motor with a larger frame size
or a high-frequency motor,
lower the setting value. Set n1-
01 = 1 [Hunting Prevention
Selection = Enabled].
• If the volume of the motor
excitation sound is too high,
increase the carrier frequency.
• If hunting or oscillation occur at
low or mid-range speeds,
decrease the carrier frequency.
• If torque or speed response are
slow, decrease the setting value.
• If hunting or oscillation occur,
increase the setting value.
• If torque at low speeds (10 Hz
or lower) is not sufficient,
increase the setting value.
• If hunting or oscillation occur
with light loads, decrease the
setting value.
Decrease the setting value in these
conditions:
• Drive trips at overload.
• Hunting or oscillation.
• If torque at low speeds (10 Hz
or lower) is not sufficient,
increase the setting value.
• If there is large initial vibration
Voltage]
at start up, decrease the setting
value
Set E2-01 [Motor Rated Current],
E2-02 [Motor Rated Slip], and E2-
03 [Motor No-Load Current], then
adjust C3-01.
Default
1.00
0.10 - 2.00
*1
1 (2 kHz)
1 to upper limit value
*2
200 ms
100 ms to 1000 ms
1.00
0.50 - 1.50
1.00
0.00 - 1.00
*3
• E1-08: 16.0 V
Default setting +/- 5 V
*3
• E1-10: 12.0 V
0.0 (no slip compensation)
0.5 - 1.5
Recommended Setting
*4
3
481
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