Open Loop Vector Control For Pm Motors - YASKAWA GA800 Technical Reference

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Open Loop Vector Control for PM Motors

Issue
E1-xx parameters, E5-xx
Unsatisfactory motor performance
parameters
n8-55 [Motor to Load Inertia
Ratio]
n8-45 [Speed Feedback Detection
Gain]
Unsatisfactory motor torque and
speed response
C4-01 [Torque Compensation
Gain]
n8-51 [Pull-in Current @ Accel/
Decel]
• b2-02 [DC Injection Braking
• b2-03 [DC Inject Braking Time
• Oscillation when the motor
starts.
• Motor stalls.
n8-55 [Motor to Load Inertia
Ratio]
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 the
• E5-24 [PM Back-EMF L-L
load is not too high.
The drive detected stalling or STPo
[Motor Step-Out Detected] at high n8-62 [Output Voltage Limit
speed and maximum output Level]
voltage.
*1 The default setting changes when the settings for E5-01 [Motor Code Selection] and o2-04 [Drive Model (KVA) Selection] change.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
4.10 Fine Tuning during Test Runs (Adjust the Control Function)
Table 4.21 Parameters for Fine Tuning the Drive (A1-02 = 5 [OLV/PM])
Parameter Number Possible Solutions
• Check the settings for E1-06,
E1-04 [Base Frequency,
Maximum Output Frequency].
• Check the E5-xx and make sure
that you set all motor data
correctly.
Note:
Do not set E5-05 [PM Motor
Resistance (ohms/phase)] to a
line-to-line resistance value.
• Do Auto-Tuning.
Adjust to align the load inertia
ratio of the motor and machine.
Decrease the setting value in
increments of 0.05.
Adjust the setting value.
Note:
If you set this value too high, it
can cause overcompensation
and motor oscillation.
Increase the setting value in
increments of 5%.
Use DC Injection Braking at start.
Note:
Current]
This can cause the motor to
rotate in reverse for
at Start]
approximately 1/8 of a turn at
start.
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.
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 the
(mV/(rad/s))]
motor nameplate or the data
sheet, then set correct values for
Vrms (mV/rpm)]
E5-09 or E5-24.
Set to a value lower than the actual
input voltage.
Default
-
0 Near the load inertia ratio.
0.80
0.00 1.00
50%
• b2-02: 50% • b2-02: Adjust as necessary.
• b2-03: 0.00 s • b2-03: 0.5 s
0 Near the load inertia ratio.
50%
Note:
When n8-79 = 0, the drive will
Decrease in increments of 5%.
apply the n8-51 setting to the
pull-in current during
deceleration.
5.0 s
30%
0 Near the load inertia ratio.
0.80
• Yaskawa motor
Set the motor code from the
motor nameplate.
*1
• Motor from another
manufacturer
Set the values from the test
report.
• 200.0 V
• 400.0 V
Recommended Setting
-
-
-
-
4
-
-
-
231