Open Loop Vector Control Method - YASKAWA CIPR-GA50C series Technical Manual

4.11 Fine Tuning during Test Runs (Adjust the Control Function)
◆

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 @ Regen Select = Enabled above 6 Hz].
Issue
n2-01 [SpdFeedbackDetectCtr
(AFR) Gain]
• Unsatisfactory motor torque
and speed response
• Hunting or oscillation at mid-
range speeds (10 Hz to 40 Hz)
n2-02
[SpdFeedbackDetCtr(AFR)Time
Const1]
n2-03
[SpdFeedbackDetCtr(AFR)Time
Const2]
ov [overvoltage] occurs when the
drive stops accelerating, starts to
decelerate, or when there are
large changes in the load.
C4-06 [Motor 2 Torque Comp
Delay Time]
• Unsatisfactory motor torque
C4-02 [Torque Compensation
and speed response
Delay Time]
• Hunting or oscillation
144
Table 4.18 Parameters for Fine Tuning the Drive (A1-02 = 2 [OLV])
Parameter Number
• To increase the speed of torque
or speed response, decrease
the setting value in increments
of 0.05.
• If hunting or oscillation occur,
decrease the setting value in
increments of 0.05.
• To increase the speed of torque
or speed response, decrease
the setting value in increments
of 10 ms and examine the
response.
• If hunting or oscillation occur
or if the load inertia is too
much, increase the setting
value in increments of 50 ms
and examine the response.
Note:
Make sure that this parameter
setting is: n2-02 ≤ n2-03
[Automatic Freq Regulator
Time 2] holds true.
When you adjust n2-02, you
must also increase the C4-02
[Torque Compensation Delay
Time] value by the same ratio.
• If ov occurs, increase the
setting value in increments of
50 ms and examine the
response.
• If the response is not
sufficient, decrease the setting
value in increments of 10 ms
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.
• If ov occurs, increase the
setting value in increments of
10 ms and examine the
response.
• If the response is not
sufficient, decrease the setting
value in increments of 2 ms
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.
• If torque or speed response are
slow, decrease the setting
value in increments of 2 ms.
• If hunting or oscillation occur,
increase the setting value in
increments of 10 ms.
Note:
Make sure that this parameter
setting is: C4-02 ≤ C4-06
[Motor 2 Torque Comp Delay
Time].
When you adjust C4-02, you
must also increase the n2-02
[SpdFeedbackDetCtr
(AFR)TimeConst1] value by
the same ratio.
Possible Solutions
1.00
50 ms
750 ms
150 ms
*1
20 ms
YASKAWA SIEPC71061753A GA500 Technical Manual
Default Recommended Setting
0.50 - 2.00
50 ms to 2000 ms
750 ms to 2000 ms
150 ms to 750 ms
20 ms - 100 ms
*1