Motor Performance Fine-Tuning - YASKAWA Z1000U Technical Manual

6.2 Motor Performance Fine-Tuning

6.2 Motor Performance Fine-Tuning
This section offers helpful information for counteracting oscillation, hunting, and other problems that occur while performing
a trial run. Refer to the appropriate control method in this section.
Note: This section describes commonly edited parameters that may be set incorrectly. Consult Yaskawa for more information on detailed settings
and for fine-tuning the drive.
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Fine-Tuning V/f Control
Problem
Motor hunting and
Hunting Prevention Gain
oscillation at speeds
(n1-02)
between 10 and 40 Hz
• Motor noise
Carrier Frequency
• Motor hunting and
Selection (C6-02)
oscillation at speeds up
to 40 Hz
• Poor torque or speed
Torque Compensation
response
Primary Delay Time
• Motor hunting and
(C4-02)
oscillation
• Poor motor torque at
speeds below 10 Hz
Torque Compensation
Gain (C4-01)
• Motor hunting and
oscillation
• Poor motor torque at
low speeds
V/f Pattern Selection
(E1-03)
• Motor instability at
motor start
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Parameters to Minimize Motor Hunting and Oscillation
In addition to the parameters discussed in
Name
(Parameter No.)
Accel/Decel Time
(C1-01 and C1-02)
S-Curve Characteristics
(C2-01 and C2-02)
Jump Frequency
(d3-01 through d3-04)
Analog Filter Time Constant
(H3-13)
Stall Prevention
(L3-01 through L3-06)
200
Table 6.1 Parameters for Fine-Tuning Performance in V/f
Parameter No.
• Reduce the setting if insufficient motor torque relative to the size
of the load causes hunting.
• Increase the setting when motor hunting and oscillation occur
with a light load.
• Reduce the setting if hunting occurs when using a motor with a
relatively low inductance, such as a high-frequency motor or a
motor with a larger frame size.
• Increase the carrier frequency If the motor noise is too loud.
• Lower the carrier frequency when motor hunting and oscillation
occur at speeds up to 40 Hz.
• The default setting for the carrier frequency depends on the drive
capacity (o2-04).
• Reduce the setting if motor torque and speed response are too
slow.
• Increase the setting if motor hunting and oscillation occur.
• Increase the setting if motor torque is insufficient at speeds
below 10 Hz.
• Reduce the setting if motor hunting and oscillation with a
relatively light load.
• Increase the setting if motor torque is insufficient at speeds
below 10 Hz.
• Reduce the setting If motor instability occurs at motor start.
• Set E1-03 to a pattern that fits the application.
Table 6.1, parameters in
Table 6.2 Parameters that Affect Control Performance in Applications
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.
Corrective Action
Table 6.2 indirectly affect motor hunting and oscillation.
Application
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Suggested
Default
Setting
1.00 0.10 to 2.00
1 (2 kHz) 1 to max. setting
Depends on
100 to 1000 ms
o2-04
1.00 0.50 to 1.50
Depends on Default setting
o2-04 ±5 V