Parameters To Minimize Motor Hunting And Oscillation - YASKAWA AC Drive-A1000 Technical Manual

6.2 Motor Performance Fine-Tuning
Problem
Motor hunting and ASR Primary Delay
oscillation Time Constant (C5-06)
Motor stall makes normal Motor parameters (E1-
operation impossible oo, E5-oo)
Feed Forward Control
Overshoot or undershoot
(n5-01)
at speed changes with
Inertia Auto-Tuning
high inertia load
(T2-01 = 8)
<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
and oscillation.
Name
(Parameter No.)
Dwell Function
(b6-01 through b6-04)
Droop Function
(b7-01, b7-02)
Accel/Decel Time
(C1-01 through C1-11)
S-Curve Characteristics
(C2-01 through C2-04)
Jump Frequency
(d3-01 through d3-04)
Analog Filter Time Constant
(H3-13)
Stall Prevention
(L3-01 through L3-06, L3-11)
Torque Limits
(L7-01 through L7-04, L7-06, L7-07)
Feed Forward Control
(n5-01 through n5-03)
294
Parameter No.
Increase the setting if the load is less rigid and subject to oscillation.
Check the motor parameter settings.
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.
290
Table 6.7 Parameters that Affect Control Performance in Applications
Prevents motor speed loss by maintaining the output frequency when working with heavy loads or when there
is powerful backlash on the machine side.
Balances the load between two motors driving the same load when A1-02 is set to 3 or 7.
Adjusting accel and decel times will affect the torque presented to the motor during acceleration or
deceleration.
Prevents shock at the beginning and end of acceleration and deceleration.
Skips over the resonant frequencies of connected machinery.
Prevents fluctuation in the analog input signal due to noise.
• 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.
• 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.
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.
Corrective Action
through 293, the following parameters indirectly affect motor hunting
Application
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
Suggested
Default
Setting
0.004 to
0.016 s
<1>
0.020 s
- -
0 1