YASKAWA LA500, Technical Manual

Page: 107 / 376

Startup
Procedure
and
T
est
Run
4
4.11 Fine Tuning during Test Runs (Adjust the Control Function)
YASKAWA SIEPYEULA5001C LA500 Technical Manual 107
4.11 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.
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 4.12 Parameters for Fine Tuning the Drive ( A1-02 = 0 [V/f] )
Issue Possible Solutions Parameter Default Recommended
Setting
Hunting or oscillation at mid-range speeds (10
Hz to 40 Hz)
• 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] .
n1-02 [Hunting
Prevention Gain
Setting]
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)
• 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.
C6-02 [Carrier
Frequency Selection]
3 (8 kHz)
*1
1 to upper limit value
•
Unsatisfactory motor torque and speed
response
• Hunting or oscillation
• If torque or speed response are slow, decrease
the setting value.
•
If hunting or oscillation occur, increase the
setting value.
C4-02 [Torque
Compensation Delay
Time]
200 ms
*2
100 ms to 1000 ms
• Torque at low speeds (10 Hz or lower) is not
sufficient.
• Hunting or oscillation
• 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.
C4-01 [Torque
Compensation Gain]
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.
Decrease the setting value in these conditions:
•
Drive trips at overload.
•
Hunting or oscillation.
C4-01 [Torque
Compensation Gain]
1.00 0.00 - 1.00
• Torque at low speeds (10 Hz or lower) is not
sufficient.
•
Large initial vibration at start up.
• 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 [Mid Point A
Voltage]
•
E1-10 [Minimum
Output Voltage]
•
E1-08: 17.2 V
*3
•
E1-10: 7.4 V
*3
Default s/- 5 V
*4
Speed precision is unsatisfactory.
Set E2-01 [Motor Rated Current], E2-02 [Motor
Rated Slip], and E2-03 [Motor No-Load
Current]
, then adjust C3-01 .
C3-01 [Slip
Compensation Gain] 0.0 (no slip
compensation)
0.5 - 1.5
*1 The default setting changes when the settings for 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.
◆
Open Loop Vector Control Method
In Open Loop Vector Control, keep C4-01 [Torque Compensation Gain] at its default setting (1.00).
If you cannot get speed precision during regeneration in Open Loop Vector Control, set C3-04 = 1 [Slip
Compensation at Regen = Enabled Above 6 Hz] .