4.11 Fine Tuning during Test Runs (Adjust the Control Function)
108 YASKAWA SIEPYEULA5001C LA500 Technical Manual
Table 4.13 Parameters for Fine Tuning the Drive (A1-02 = 2 [OLV])
Issue Possible Solutions Parameter Default Recommended
Setting
• Unsatisfactory motor torque and speed
response
• Hunting or oscillation at mid-range speeds
(10 Hz to 40 Hz)
• To increase the speed of torque or speed
response, decrease the setting value in 0.05-
unit increments.
• If hunting or oscillation occur, decrease the
setting value in 0.05-unit increments.
n2-01 [Automatic Freq
Regulator Gain]
1.00 0.50 to 2.00
• To increase the speed of torque or speed
response, decrease the setting value in 10 ms
increments and examine the response.
• If hunting or oscillation occur or if the load
inertia is too much, increase the setting value
in 50 ms increments and examine the
response.
Note:
Make sure that this parameter setting is: n2-
02 ≤ n2-03 [Automatic Freq Regulator Time
2].
When you adjust n2-02, you must also
increase the C4-02 [Torque Compensation
Delay Time] value by the same ratio.
n2-02 [Automatic Freq
Regulator Time 1]
50 ms 50 ms to 2000 ms
• Speed response is slow.
• Speed is not stable.
• If speed response is slow, decrease the setting
value in 10 ms increments.
• If speed is not stable, increase the value in 10
ms increments.
C3-02 [Slip
Compensation Delay
Time]
200 ms
*1
100 ms to 500 ms
Speed precision is unsatisfactory.
• If speed is too slow, increase the setting value
in 0.1 unit increments.
• If speed is too fast, decrease the setting value
in 0.1 unit increments.
C3-01 [Slip
Compensation Gain]
1.0
*2
0.5 to 1.5
• The volume of the motor excitation sound is
too high.
• Hunting or oscillation at low speeds (10 Hz or
lower)
• If the volume of the motor excitation sound is
too high, increase the carrier frequency.
• If hunting or oscillation occur at low speeds,
decrease the carrier frequency.
C6-02 [Carrier
Frequency Selection]
3 (8 kHz) 1 to upper limit value
• Torque at low speeds (10 Hz or lower) is not
sufficient. speed response is slow.
• Speed response is slow.
• Large initial vibration at start up.
• If torque or speed response are slow, increase
the setting value.
• If there is large initial vibration at start up,
decrease the setting value
Note:
If you set the value too high, the drive can
output a large torque reference although the
load is light.
E1-08 [Mid Point A
Voltage]
25.0 V
Default setting +/- 2 V
*3
E1-10 [Minimum
Output Voltage]
5 V
*1 The default setting changes when the settings for A1-02 [Control Method Selection] and o2-04 [Drive Model (KVA) Selection]
change.
*2 The default setting changes when the settings for A1-02 [Control Method Selection] and E1-03 [V/f Pattern Selection] change.
*3 Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.
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