Advanced Open Loop Vector Control Method For Pm Motors - YASKAWA GA700 Series Technical Manual

4.10 Fine Tuning during Test Runs (Adjust the Control Function)
Issue
There is too much current during n8-79 [Pull-in Current at
deceleration. Deceleration]
n8-47 [Pull-in Current Comp
Filter Time]
n8-48 [Pull-in/Light Load Id
Current]
Stalling or oscillation occurs
when you apply the load during
constant speed
n8-55 [Motor to Load Inertia
Ratio]
n8-45 [Speed Feedback Detection
Hunting or oscillation
Gain]
• E5-09 [PM Back-EMF Vpeak
The drive detects STPo [Motor
Step-Out Detected] fault when
• E5-24 [PM Back-EMF L-L
the load is not too high.
The drive detected stalling or
STPo [Motor Step-Out Detected] n8-62 [Output Voltage Limit
at high speed and maximum Level]
output voltage.
*1 The default setting changes when the settings for E5-01 [Motor Code Selection] and o2-04 [Drive Model (KVA) Selection] change.
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Advanced Open Loop Vector Control Method for PM Motors

Table 4.22 Parameters for Fine Tuning the Drive (A1-02 = 6 [AOLV/PM])
Issue
• High speed
• Low speed
• Unsatisfactory motor torque
and speed response
• Hunting or oscillation
• High speed
• Low speed
The drive cannot find ASR
C5-07 [ASR Gain Switchover
proportional gain or integral time
Frequency]
for low speed or high speed.
Hunting or oscillation C5-06 [ASR Delay Time]
E1-xx parameters, E5-xx
Step-out
parameters
*1 The best values for a no-load operation are different than the best values for actual loading operation.
202
Parameter Number
Set n8-79 < n8-51.
Decrease the setting value in
increments of 0.2 s.
Increase the setting value in
increments of 5%.
Increase the setting value.
Note:
When you operate a single
motor or with a minimum
quantity of inertia, if you set
this value too high, it can
cause motor oscillation.
Increase the setting value in
increments of 0.05.
• Adjust the setting value.
• Examine the motor code on
(mV/(rad/s))]
the motor nameplate or the
data sheet, then set correct
Vrms (mV/rpm)]
values for E5-09 or E5-24.
Set to a value lower than the
actual input voltage.
Parameter Number
• If torque or speed response are
C5-01 [ASR Proportional Gain
slow, increase the setting value
1]
in increments of 5.00.
• If hunting or oscillation occur,
C5-03 [ASR Proportional Gain
decrease the setting value.
2]
• If torque or speed response are
slow, decrease the setting
C5-02 [ASR Integral Time 1]
value.
• If hunting or oscillation occur,
C5-04 [ASR Integral Time 2]
increase the setting value.
Change the ASR proportional
gain and ASR integral time to
conform to the output frequency.
If the rigidity of the machine is
unsatisfactory and vibration is
possible, increase the setting
value in increments of 0.010.
Refer to the motor nameplate or
test report and set E1-xx or E5-xx
correctly.
Possible Solutions
50%
Note:
When n8-79 = 0, the drive
will apply the n8-51 setting to
the pull-in current during
deceleration.
5.0 s
30%
0
0.80
*1
• 200.0 V
• 400.0 V
Possible Solutions
10.00
0.500 s
0.0%
0.016 s
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Default Recommended Setting
Decrease in increments of 5%.
Near the load inertia ratio.
• Yaskawa motor
Set the motor code from the
motor nameplate.
• Motor from another
manufacturer
Set the values from the test
report.
Default Recommended Setting
*1
5.00 to 30.00
0.300 s to 1.000 s
0.0% to maximum rotation speed
0.016 s to 0.035 s
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*1
*1
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