Startup Procedure and
Test Run
3
3.10 Fine Tuning during Test Runs (Adjust the Control Function)
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 211
◆ Fine-Tuning Open Loop Vector Control for PM Motors
Table 3.21 Parameters for Fine-Tuning Performance in OLV/PM
Issue Parameter Number Solution Default Setting Recommended
Setting
Unsatisfactory motor
performance
E1 parameters, E5
parameters
• 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.
- -
Unsatisfactory motor
torque and speed response
n8-55 [Motor to Load
Inertia Ratio]
Adjust to match the load
inertia ratio of the motor
and machine.
0
Near the actual load
inertia ratio.
n8-45 [Speed Feedback
Detection Gain]
Decrease the setting value
in increments of 0.05.
0.80 -
C4-01 [Torque
Compensation Gain]
Adjust the setting value.
Note:
Setting this value too
high can cause
overcompensation and
motor oscillation.
0.00 1.00
• Oscillation at start.
• Motor stalls.
n8-51 [Pull-in Current @
Accel/Decel]
Increase the setting value
in increments of 5%.
50% -
• b2-02 [DC Injection
Braking Current]
• b2-03 [DC Inject
Braking Time at Start]
Use DC Injection Braking
at start.
Note:
This can cause the
motor to rotate in
reverse for
approximately 1/8 of a
turn at start.
• b2-02: 50%
• b2-03: 0.0 s
• b2-02: Adjust as
necessary.
• b2-03: 0.5 s
n8-55 [Motor to Load
Inertia Ratio]
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.
0
Near to the actual load
inertia ratio.
There is too much current
during deceleration.
n8-79 [Pull-in Current at
Deceleration]
Set n8-79 < n8-51.
0%
Note:
When n8-79 = 0, the
drive will apply the n8-
51 setting to the pull-in
current during
deceleration.
Decrease in increments of
5%.
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