YASKAWA T1000A, Техническое руководство, Страница: 271 / 517

6.2 Motor Performance Fine-Tuning
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 271
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Fine-Tuning Closed Loop Vector Control for PM Motors
Table 6.6 Parameters for Fine-Tuning Performance in CLV/PM
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Parameters to Minimize Motor Hunting and Oscillation
In addition to the parameters discussed on page 268 through 271 , the following parameters indirectly affect motor
hunting and oscillation.
Table 6.7 Parameters that Affect Control Performance in Applications
Problem Parameter No. Corrective Action Default
Suggested
Setting
• Poor torque or speed response
• Motor hunting and oscillation
High-speed: ASR Proportional
Gain 1 (C5-01)
Low-speed: 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
High-speed: ASR Integral Time 1
(C5-02)
Low-speed: 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.
0 1
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.
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.
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. Used when the load is too heavy and also during sudden acceleration/
deceleration.
• Adjustment is not normally required because Stall Prevention is enabled as a default. Disable Stall Prevention during
deceleration (L3-04 = “0”) when using a braking resistor.
Torque Limits (L7-01 through L7-04, L7-06, L7-07)
• Sets the maximum torque for Open Loop Vector Control.
• Ensure that the drive capacity is greater than the motor capacity when increasing this setting. Be careful when reducing this
value because motor speed loss may occur with heavy loads.
Feed Forward Control (n5-01 through n5-03)
Used to increase response for acceleration/deceleration or to reduce overshooting when there is low machine rigidity and the
gain of the speed controller (ASR) cannot be increased. The inertia ratio between the load and motor and the acceleration time
of the motor running alone must be set.