YASKAWA GA500 series, Programming

Page: 481 / 526

Startup
Procedure
and
T
est
Run
3
3.7 Fine Tuning during Test Runs (Adjust the Control Function)
YASKAWA TOEPYAIGA5002A GA500 Programming 481
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 483
• Advanced Open Loop Vector Control Method for PM Motors on page 484
• 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
Table 3.14 Parameters for Fine Tuning the Drive ( A1-02 = 0 [V/f] )
Issue Parameter Number Possible Solutions Default Recommended Setting
Hunting or oscillation at mid-range
speeds (10 Hz to 40 Hz) n1-02 [Hunting Prevention Gain
Setting]
•
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]
.
1.00 0.10 - 2.00
• The volume of the motor
excitation sound is too high.
•
Hunting or oscillation at low
speeds (10 Hz or lower), or at
mid-range speeds (10 Hz to 40
Hz)
C6-02 [Carrier Frequency
Selection]
• 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.
1 (2 kHz)
*1
1 to upper limit value
• Unsatisfactory motor torque
and speed response
•
Hunting or oscillation
C4-02 [Torque Compensation
Delay Time]
• If torque or speed response are
slow, decrease the setting value.
•
If hunting or oscillation occur,
increase the setting value.
200 ms
*2
100 ms to 1000 ms
•
Torque at low speeds (10 Hz or
lower) is not sufficient.
• Hunting or oscillation
C4-01 [Torque Compensation
Gain]
•
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.
1.00 0.50 - 1.50
•
If you use the drive with an IE3
high efficiency motor, the
current that is more than the
motor rated current will flow
and trip at overload. Hunting or
oscillation.
C4-01 [Torque Compensation
Gain]
Decrease the setting value in these
conditions:
• Drive trips at overload.
• Hunting or oscillation.
1.00 0.00 - 1.00
• Torque at low speeds (10 Hz or
lower) is not sufficient.
•
Large initial vibration at start
up.
•
E1-08 [Mid Point A Voltage]
•
E1-10 [Minimum Output
Voltage]
•
If torque at low speeds (10 Hz
or lower) is not sufficient,
increase the setting value.
•
If there is large initial vibration
at start up, decrease the setting
value
•
E1-08: 16.0 V
*3
•
E1-10: 12.0 V
*3
Default s/- 5 V
*4
Speed precision is unsatisfactory. C3-01 [Slip Compensation Gain]
Set E2-01 [Motor Rated Current],
E2-02 [Motor Rated Slip], and E2-
03 [Motor No-Load Current]
, then
adjust C3-01 .
0.0 (no slip compensation) 0.5 - 1.5
*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.