Fine-Tuning Open Loop Vector Control For Pm Motors - YASKAWA GA700 Technical Manual

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Fine-Tuning Open Loop Vector Control for PM Motors

Issue
Unsatisfactory motor E1 parameters, E5
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
• b2-03 [DC Inject
• Oscillation at start.
• Motor stalls.
n8-55 [Motor to Load
Inertia Ratio]
There is too much current n8-79 [Pull-in Current at
during deceleration. Deceleration]
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
3.10 Fine Tuning during Test Runs (Adjust the Control Function)
Table 3.21 Parameters for Fine-Tuning Performance in OLV/PM
Parameter Number
• Check the settings for
E1-06, E1-04 [Base
Frequency, Maximum
Output Frequency].
• Check the E5-xx and
make sure that all
motor data has been set
correctly.
Note:
Do not set E5-05 [PM
Motor Resistance
(ohms/phase)] to a
line-to-line resistance
value.
• Do Auto-Tuning.
Adjust to match the load
inertia ratio of the motor
and machine.
Decrease the setting value
in increments of 0.05.
Adjust the setting value.
Note:
Setting this value too
high can cause
overcompensation and
motor oscillation.
Increase the setting value
in increments of 5%.
Use DC Injection Braking
at start.
Note:
Braking Current]
This can cause the
motor to rotate in
Braking Time at Start]
reverse for
approximately 1/8 of a
turn at start.
Increase the setting value.
Note:
When operating a
single motor or with a
minimum amount of
inertia, setting this
value too high can
cause motor
oscillation.
Set n8-79 < n8-51.
Solution Default Setting
0
0.80
0.00
50%
• b2-02: 50%
• b2-03: 0.0 s
0
0%
Note:
When n8-79 = 0, the
drive will apply the n8-
51 setting to the pull-in
current during
deceleration.
Recommended
Setting
- -
Near the actual load
inertia ratio.
-
1.00
-
• b2-02: Adjust as
necessary.
• b2-03: 0.5 s
Near to the actual load
inertia ratio.
Decrease in increments of
5%.
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