3.7 Fine Tuning during Test Runs (Adjust the Control Function)
482 YASKAWA TOEPYAIGA5002A GA500 Programming
◆ 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].
Table 3.15 Parameters for Fine Tuning the Drive (A1-02 = 2 [OLV])
Issue Parameter Number Possible Solutions Default Recommended Setting
• Unsatisfactory motor torque
and speed response
• Hunting or oscillation at mid-
range speeds (10 Hz to 40 Hz)
n2-01 [Automatic Freq Regulator
Gain]
• 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.
1.00 0.50 to 2.00
n2-02 [Automatic Freq Regulator
Time 1]
• 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.
50 ms 50 ms to 2000 ms
ov [Overvoltage] occurs when the
drive stops accelerating, starts to
decelerate, or when there are large
changes in the load.
n2-03 [Automatic Freq Regulator
Time 2]
• If ov occurs, increase the setting
value in 50 ms increments and
examine the response.
• If the response is not sufficient,
decrease the setting value in 10
ms increments and examine the
response.
Note:
Make sure that this parameter
setting is: n2-02 [Automatic
Freq Regulator Time 1] ≤ n2-
03. When you adjust n2-03,
you must also increase the C4-
06 [Motor 2 Torque Comp
Delay Time] value by the same
ratio.
750 ms 750 ms to 2000 ms
C4-06 [Motor 2 Torque Comp
Delay Time]
• If ov occurs, increase the setting
value in 10 ms increments and
examine the response.
• If the response is not sufficient,
decrease the setting value in 2
ms increments and examine the
response.
Note:
Make sure that this parameter
setting is: C4-02 [Torque
Compensation Delay Time] ≤
C4-06.
When you adjust C4-06, you
must also increase the n2-03
[Automatic Freq Regulator
Time 2] value by the same
ratio.
150 ms 150 ms to 750 ms
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