6.10 Fine Tuning during Test Runs (Adjust the Control Function)
504 YASKAWA TOEPYAIGA8001B GA800 Drive Maintenance & Troubleshooting
Issue Parameter Number Possible Solutions Default Recommended Setting
Hunting or oscillation C5-06 [ASR Delay Time]
*4
• If torque or speed response are
slow, decrease the setting value
in increments of 0.010.
• If the rigidity of the machine is
unsatisfactory and vibration is
possible, increase the setting
value.
0.004 s 0.004 s to 0.020 s
When you operate the drive at a
frequency close to zero speed, the
motor rotates at a frequency
slightly higher than the frequency
reference.
• E1-09 [Minimum Output
Frequency]
• n4-70 [Speed Command Comp
@ Low Freq]
• Set E1-09 > 0.
Note:
When frequency reference E1-
09 < 0, the drive output will
turn OFF.
• Decrease the setting value of
n4-70 in 0.1 Hz increments.
Note:
If you set the value too low,
the motor can rotate in reverse.
• E1-09 = 0.0 Hz
• n4-70 = 1.00 Hz
• E1-09 = 0.5 Hz
• n4-70 = 0.50 Hz
*1 The default setting changes when the settings for C6-01 [Normal / Heavy Duty Selection] and o2-04 [Drive Model (KVA) Selection]
change.
*2 The default setting changes when the setting for o2-04 [Drive Model Selection] changes.
*3 Refer to the section on C5-xx parameters for more information about speed control (ASR).
*4 The best values for a no-load operation are different than the best values for actual loading operation.
◆ Open Loop Vector Control for PM Motors
Table 6.21 Parameters for Fine Tuning the Drive (A1-02 = 5 [OLV/PM])
Issue Parameter Number Possible Solutions Default Recommended Setting
Unsatisfactory motor performance
E1-xx parameters, E5-xx
parameters
• 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.
- -
Unsatisfactory motor torque and
speed response
n8-55 [Motor to Load Inertia
Ratio]
Adjust to align the load inertia
ratio of the motor and machine.
0 Near the 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:
If you set this value too high, it
can cause overcompensation
and motor oscillation.
0.00 1.00
• Oscillation when the motor
starts.
• 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: 0.00 s
• b2-02: Adjust as necessary.
• b2-03: 0.5 s
n8-55 [Motor to Load Inertia
Ratio]
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.
0 Near the load inertia ratio.
There is too much current during
deceleration.
n8-79 [Pull-in Current at
Deceleration]
Set n8-79 < n8-51.
50%
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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