Open Loop Vector Control Method - YASKAWA GA80U4720ABM Manual

*4 Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.
*5 In Closed Loop V/f Control, ASR only controls the output frequency. You cannot make a high-gain as in Closed Loop Vector control.
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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)
TimeConst1]
n2-03 [SpdFeedbackDetCtr(AFR)
TimeConst2]
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]
YASKAWA SIEPC71061737B GA800 Drive Technical Reference
4.10 Fine Tuning during Test Runs (Adjust the Control Function)
Table 4.18 Parameters for Fine Tuning the Drive (A1-02 = 2[OLV])
Parameter Number Possible Solutions
• 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
[Motor 1 Torque Comp 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
[SpdFeedbackDetCtr(AFR)
TimeConst2] value by the same
ratio.
Default
1.00 0.50 - 2.00
50 ms 50 ms to 2000 ms
750 ms 750 ms to 2000 ms
150 ms 150 ms to 750 ms
Recommended Setting
4
203