Open Loop Vector Control Method - YASKAWA GA700 Series Technical Manual

4.10 Fine Tuning during Test Runs (Adjust the Control Function)
*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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Precaution When You Use IE3 Premium Efficiency Motors
IE3 motors have different motor characteristics from IE1 and other motors. Set the parameters as specified by the
motor characteristics. If the drive detects oC [Overcurrent] or ov [Overvoltage] during speed search after the
drive restores power after a momentary power loss, set these parameters:
• b3-03 [Speed Search Deceleration Time] = default value × 2
• L2-03 [Minimum Baseblock Time] = default value × 2
• L2-04 [Powerloss V/f Recovery Ramp Time] = default value × 2
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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]
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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
[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.
Possible Solutions
1.00
50 ms
750 ms
150 ms
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Default Recommended Setting
0.50 - 2.00
50 ms to 2000 ms
750 ms to 2000 ms
150 ms to 750 ms