YASKAWA FSDrive-MV1000 Series Instructions For Use Manual page 141

Problem
Speed Feedback
Detection Control
(AFR) Time Constant
2 (n2-03)
• Overvoltage trips when
accelerating, decelerating,
or during sudden speed or
load changes.
Torque Compensation
Primary Delay Time 2
(C4-06)
• Poor motor torque and
Torque Compensation
speed response
Primary Delay Time
• Motor hunting and
(C4-02)
oscillation
Slip Compensation
Poor speed response and
Primary Delay Time
stability
(C3-02)
Slip Compensation
Poor speed precision
Gain (C3-01)
Mid Output
• Poor motor torque at low Frequency Voltage
speeds (E1-08)
• Poor speed response Minimum Output
• Motor instability at start Frequency Voltage
(E1-10)
<1> Determined by o2-04 (Drive Model Selection)
When using Open Loop Vector Control, leave the torque compensation gain (C4-01) at its default setting of 1.00.
In the Open Loop Vector Control, when the speed precision is not improved for regenerative operation, enable slip
compensation during regeneration by setting parameter C3-04 to 1.
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
Parameter No.
• Gradually increase the setting in 50 ms increments if
overvoltage trips occur.
• Gradually reduce the setting in 10 ms increments if response
is slow.
Note: Ensure that n2-02 ≤ n2-03.When changing
• Gradually increase the setting in 10 ms increments and check
the performance if overvoltage trips occur.
• Gradually reduce the setting in 2 ms increments and check
the performance if response is slow.
Note: Ensure that C4-02 ≤ C4-06. When changing
• Gradually reduce the setting by 2 ms if motor torque and
speed response are too slow.
• Gradually increase the setting by 10 ms if motor hunting and
oscillation occur.
Note: Ensure that C4-02 ≤ C4-06. When changing
• Gradually reduce the setting in 10 ms increments if response
is slow.
• Gradually increase the setting in 10 ms increments if speed is
unstable.
• Gradually increase the setting in 0.1 ms increments if speed
is too slow.
• Gradually reduce the setting in 0.1 ms increments if speed is
too fast.
• Increase the setting if motor torque and speed response are
too slow.
• Reduce the setting if the motor exhibits excessive instability
at motor start.
Note: When working with a relatively light load,
5.2 Motor Performance Fine-Tuning
Corrective Action
n2-03, increase the value of
C4-06, Torque Compensation Primary Delay
Time 2, proportionally.
C4-06, increase the value of
n2-03 proportionally.
C4-02, increase the value of
n2-02, AFR Time Constant 1,
proportionally.
increasing this value too much can cause
overtorque.
Suggested
Default
Setting
750 to
750 ms
2000 ms
150 to
150 ms
750 ms
20 to
50 ms
100 ms
<1>
100 to
200 ms
500 ms
1.0 0.5 to 1.5
±1% of the
E1-08:
<1>
motor rated
E1-10:
<1>
voltage
5
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