Problem Parameter No. Corrective Action Default
Suggested
Setting
Stalling or oscillation
occur when load is
applied during constant
speed
Pull-In Current
Compensation Time
Constant (n8-47)
Reduce 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)
Reduce the speed feedback detection gain in n8-45. 0.8
Increase in
increments 0.05
STo fault trips when the
load is not excessively
high
Induced Voltage
Constant (E5-09 or
E5-24)
• Check and adjust the induced voltage constant.
• Check the motor nameplate and the data sheet or contact the
motor manufacturer.
Depends 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 n8-62 575 Vac
Set equal to input
voltage
u
Fine-Tuning Advanced Open Loop Vector Control for PM Motors
Table 6.5 Parameters for Fine-Tuning Performance in AOLV/PM
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)
• Gradually increase the setting in increments of 5 if motor torque
and speed response are too slow.
• Reduce the setting if motor hunting and oscillation occur.
• Only adjust parameter C5-03 when C5-05 > 0.
10.00
5.00 to 30.00
<1>
• Poor torque or speed
response
• Motor hunting and
oscillation
ASR Integral Time 1
(C5-02)
ASR Integral Time 2
(C5-04)
• Reduce the setting if motor torque and speed response are too
slow.
• Increase the setting if motor hunting and oscillation occur.
• Only adjust parameter C5-04 when C5-05 > 0.
0.500 s
0.300 to
1.000 s
<1>
Difficulty 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)
Switch the drive 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)
Increase the setting if the load is less rigid and subject to oscillation. 0.010 s
0.016 to
0.035 s
<1>
Motor stalling makes
normal operation
impossible
Motor parameters
(E1-oo, E5-oo)
Check the motor parameter settings. - -
<1> Optimal settings will differ between no-load and loaded operation.
u
Fine-Tuning Closed Loop Vector Control for PM Motors
Table 6.6 Parameters for Fine-Tuning Performance in CLV/PM
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)
• Gradually increase the setting in increments of 5 if motor torque
and speed response are too slow.
• Reduce the setting if motor hunting and oscillation occur.
• Perform ASR Gain Auto-Tuning if possible
20.00
10.00 to
50.00
<1>
• Poor torque or speed
response
• Motor hunting and
oscillation
ASR Integral Time 1
(C5-02)
ASR Integral Time 2
(C5-04)
• Reduce the setting if torque and speed response are too slow.
• Increase the setting if motor hunting and oscillation occur.
0.500 s
0.300 to
1.000 s
<1>
Difficulty 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)
Switch the drive between two different ASR proportional gain and
integral time settings based on the output frequency.
0.0%
0.0 to
Max r/min
6.2 Motor Performance Fine-Tuning
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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Troubleshooting
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