YASKAWA U1000 iQpump Drive, Техническое руководство

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Problem Parameter No. Corrective Action Default
Suggested
Setting
Oscillation at constant
output when U6-02
displays -10% or more.
Output Voltage Limit
Proportional Gain (for
PM Motors) (n8-63)
Decrease the output voltage limit proportional gain
(n8-63).
Note: The speed response will be slow if the
setting is too low.
1.00
0.10 to 1.00
Decrease in
decrements of 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 356 through 360 , parameters in Table 6.7 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 Input Filter Time Constant
(H3-13)
Prevents fluctuation in the analog input signal due to noise.
Stall Prevention
(L3-01 through L3-06)
• Prevents motor speed loss when the load is too heavy or during sudden acceleration/deceleration.
• Adjustment is not normally necessary because Stall Prevention is enabled as a default.
Torque Limits
(L7-01 through L7-04, L7-06, L7-07)
• Sets the maximum torque for OLV Control.
• When increasing setting values, select the drive based on calculations from the motor rated torque. 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
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual 361
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Troubleshooting