Problem Parameter No. Corrective Action Default
Suggested
Setting
Motor hunting and
oscillation
ASR Primary Delay
Time Constant (C5-06)
Increase the setting if the load is less rigid and subject to oscillation. 0.016 s
0.004 to
0.020 s
<1>
Motor stall makes normal
operation impossible
Motor parameters (E1-
oo, E5-oo)
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)
Set parameter n5-01 to 1 to Enable Feed Forward then perform
Inertia Tuning. Manually set parameters C5-17, C5-18, and n5-03
if Inertia Tuning is not possible.
0 1
<1> Optimal settings will differ between no-load and loaded operation.
u
Parameters to Minimize Motor Hunting and Oscillation
In addition to the parameters discussed on pages 290 through 293, the following parameters indirectly affect motor hunting
and oscillation.
Table 6.7 Parameters that Affect Control Performance in Applications
Name
(Parameter No.)
Application
Dwell Function
(b6-01 through b6-04)
Prevents motor speed loss by maintaining the output frequency when working with heavy loads or when there
is powerful backlash on the machine side.
Droop Function
(b7-01, b7-02)
Balances the load between two motors driving the same load when A1-02 is set to 3 or 7.
Accel/Decel Time
(C1-01 through C1-11)
Adjusting accel and decel times will affect the torque presented to the motor during acceleration or
deceleration.
S-Curve Characteristics
(C2-01 through C2-04)
Prevents shock at the beginning and end of acceleration and deceleration.
Jump Frequency
(d3-01 through d3-04)
Skips over the resonant frequencies of connected machinery.
Analog Filter Time Constant
(H3-13)
Prevents fluctuation in the analog input signal due to noise.
Stall Prevention
(L3-01 through L3-06, L3-11)
• Prevents motor speed loss and overvoltage when the load is too heavy or during sudden acceleration/
deceleration.
• Adjustment is not normally necessary because Stall Prevention is enabled as a default. Set L3-04 to 0 to
disable Stall Prevention during deceleration when using a braking resistor.
Torque Limits
(L7-01 through L7-04, L7-06, L7-07)
• Sets the maximum torque for OLV Control.
• Ensure that the drive capacity is greater than the motor capacity when increasing this setting. Motor speed
loss may occur with heavy loads.
Feed Forward Control
(n5-01 through n5-03)
Increases response for acceleration/deceleration and reduces overshooting when there is low machine rigidity
and ASR gain cannot be increased. Set the inertia ratio between the load and motor and the acceleration time
of the motor running alone.
6.2 Motor Performance Fine-Tuning
294
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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