Fine-Tuning Closed Loop Vector Control; Parameters To Minimize Motor Hunting And Oscillation - YASKAWA FSDrive-MV1000 Series Instructions For Use Manual

5.2 Motor Performance Fine-Tuning
u Fine-Tuning Closed Loop Vector Control
Problem
• Poor motor torque and
speed response
• Motor hunting and
oscillation
• Poor motor torque and
speed response
• Motor hunting and
oscillation
Difficulty maintaining the
ASR proportional gain or the
integral time at the low or
high end of the speed range
Motor hunting and
oscillation
<1> For more information about Speed Control (ASR), refer to the description of the Speed Control (C5-
FSDrive-MV1000 Parameter Guide (TOEP C710687 03).
u Parameters to Minimize Motor Hunting and Oscillation
In addition to the parameters discussed on page
hunting and oscillation.
Table 5.4 Parameters that Affect Control Performance in Applications
Parameter No.
Dwell Function
(b6-01 through b6-04)
Droop Function
(b7-01, b7-03)
Accel/Decel Time
(C1-01 through C1-11)
S-Curve Characteristics
(C2-01 to C2-04)
Jump Frequency
(d3-01 through d3-04)
Analog Input Filter Time
Constant
(H3-13)
Stall Prevention
(L3-01 through L3-06, L3-11,
L3-23, L3-27)
Torque Limits
(L7-01 through L7-04, L7-06,
L7-07, L7-16)
142
Table 5.3 Parameters for Fine-Tuning the Performance in CLV
Parameter No.
<High speed side>
ASR Proportional Gain 1
• Gradually increase the setting in increments of 5 if motor
(C5-01)
torque and speed response are too slow.
<Low speed side>
• Reduce the setting if motor hunting and oscillation occur.
ASR Proportional Gain 2
(C5-03)
<1>
<High speed side>
ASR Integral Time 1 • Reduce the setting if motor torque and speed response
(C5-02) are too slow.
<Low speed side> • Increase the setting if motor hunting and oscillation
ASR Integral Time 2 occur.
(C5-04)
<1>
Switch the drive between two different ASR proportional
ASR Gain Switching
gain and integral time settings based on the output
Frequency (C5-07)
<1>
frequency.
• Gradually reduce the setting in 0.01 increments if motor
ASR Primary Delay Time torque and speed response are too slow.
Constant (C5-06) • Increase the setting if the load is less rigid and subject to
<1>
oscillation.
Table 5.4
Prevents motor speed loss by maintaining the output frequency when working with heavy loads or when there
is powerful backlash on the machine side.
Moderates motor torque and balances the load level between two motors.
(Enabled when Control Mode A1-02 = 3)
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 analog input signals 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 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.
Corrective Action
and Table 5.5, the following parameters indirectly affect motor
Application
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
Suggested
Default
Setting
5.00 5.00 to 30.00
0.300 to
5.000 s
5.000 s
0.0 to max
0.0 Hz output
frequency
0.004 to
0.012 s
0.060 s
) parameters in the separate