6.2 Motor Performance Fine-Tuning
298 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
◆ Fine-Tuning Advanced Open Loop Vector Control for PM Motors
Table 6.5 Parameters for Fine-Tuning Performance in AOLV/PM
◆ Fine-Tuning Closed Loop Vector Control for PM Motors
Table 6.6 Parameters for Fine-Tuning Performance in CLV/PM
Oscillation at start or the motor stalls
Pull-In Current during Accel/
Decel (n8-51)
Increase the pull-in current set in n8-51 50%
Increase in steps
of 5%
DC Injection Braking Current
(b2-02), DC Injection Time at
Start (b2-03)
Use DC Injection Braking at start to align the rotor. Be aware that this
operation can cause a short reverse rotation at start.
b2-02 = 50%
b2-03 = 0.0 s
b2-03 = 0.5 s
Increase b2-02 if
needed
Load Inertia Ratio (n8-55) Increase the load inertia ratio. 0
Close to the actual
load inertia ratio
Stalling or oscillation occur when load
is applied during constant speed
Pull-In Current Compensation
Time Constant (n8-47)
Decrease n8-47 if hunting occurs during constant speed 5.0 s
Reduce in
increments of 0.2 s
Pull-In Current (n8-48) Increase the pull-in current in n8-48. 30%
Increase in
increments of 5%
Load Inertia Ratio (n8-55) Increase the load inertia ratio. 0
Close to the actual
load inertia ratio
Hunting or oscillation occur
Speed feedback Detection Gain
(n8-45)
Decrease the speed feedback detection gain in n8-45. 0.8
Increase in
increments 0.05
STO fault trips even if the load is not
too high
Induced Voltage Constant (E5-09
or E5-24)
• Check and adjust the induced voltage constant.
• Check the motor name plate, the data sheet or contact the motor
manufacturer for getting data.
dep. on drive
capacity and
motor code
Refer to the motor
data sheet or the
nameplate.
Stalling or STO occurs at high speed as
the output voltage becomes saturated.
Output Voltage Limit (n8-62) Set the value of the input voltage to parameter n8-62
200 Vac or 400
Va c
Set equal to input
voltage
Problem Parameter No. Corrective Action Default
Suggested
Setting
• Poor torque or speed response
• Motor hunting and oscillation
ASR Proportional Gain 1
(C5-01)
ASR Proportional Gain 2
(C5-03)
• If motor torque and speed response are too slow, gradually increase the
setting by 5.
• If motor hunting and oscillation occur, decrease the setting.
• Parameter C5-03 needs to be adjusted only if C5-05 > 0.
10.00 5.00 to 30.00
<1>
<1> Optimal settings will differ between no-load and loaded operation.
• Poor torque or speed response
• Motor hunting and oscillation
ASR Integral Time 1 (C5-02)
ASR Integral Time 2 (C5-04)
• If motor torque and speed response are too slow, decrease the setting.
• If motor hunting and oscillation occur, increase the setting.
• Parameter C5-03 needs to be adjusted only if C5-05 > 0
0.500 s
0.300 to
1.000 s
<1>
Trouble maintaining the ASR
proportional gain or the integral time at
the low or high end of the speed range
ASR Gain Switching Frequency
(C5-07)
Have the drive switch between two different ASR proportional gain and
integral time settings based on the output frequency.
0.0% 0.0 to Max r/min
Motor hunting and oscillation
ASR Primary Delay Time
Constant (C5-06)
If the load is less rigid and subject to oscillation, increase this setting. 0.010 s
0.016 to
0.035 s
<1>
Motor stalling makes normal operation
impossible
Motor parameters
(E1-, E5-)
Check the motor parameter settings. - -
Problem Parameter No. Corrective Action Default
Suggested
Setting
• Poor torque or speed response
• Motor hunting and oscillation
ASR Proportional Gain 1
(C5-01)
ASR Proportional Gain 2
(C5-03)
• If motor torque and speed response are too slow, gradually increase the
setting by 5.
• If motor hunting and oscillation occur, decrease the setting.
• Perform ASR Gain Auto-Tuning if possible
20.00 10.00 to 50.00
<1>
<1> Optimal settings will differ between no-load and loaded operation.
• Poor torque or speed response
• Motor hunting and oscillation
ASR Integral Time 1 (C5-02)
ASR Integral Time 2 (C5-04)
• If motor torque and speed response are too slow, decrease the setting.
• If motor hunting and oscillation occur, increase the setting.
0.500 s
0.300 to
1.000 s
<1>
ASR proportional gain or the integral
time at the low or high end of the speed
range
ASR Gain Switching Frequency
(C5-07)
Have the drive switch between two different ASR proportional gain and
integral time settings based on the output frequency.
0.0% 0.0 to Max r/min
Motor hunting and oscillation
ASR Primary Delay Time
Constant (C5-06)
If the load is less rigid and subject to oscillation, increase this setting. 0.016 s
0.004 to
0.020 s
<1>
Motor stall makes normal operation
impossible
Motor parameters
(E1-, E5-)
Check the motor parameter settings. - -
Overshoot or undershoot at speed
changes with high inertia load.
Feed Forward Control (n5-01)
Inertia Auto-Tuning (T2-01 = 8)
Enable Feed Forward Control by setting parameter n5-01 = 1 and perform
Inertia Auto-Tuning. If Auto-Tuning cannot be performed set parameters
C5-17, C5-18 and n5-03 manually.
01
Problem Parameter No. Corrective Action Default
Suggested
Setting
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