Yaskawa AC Drive-P1000 Industrial Fan - Manual (Page 290)

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 section below that corresponds to the motor control method used.
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.
u Fine-Tuning V/f Control
Table 6.1 Parameters for Fine-Tuning Performance in V/f Control
Problem Parameter No. Corrective Action Default
Suggested
Setting
Motor hunting and
oscillation at speeds
between 10 and 40 Hz
Hunting Prevention
Gain (n1-02)
• 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.
1.00 0.10 to 2.00
• Motor noise
• Motor hunting and
oscillation at speeds
up to 40 Hz
Carrier Frequency
Selection (C6-02)
• 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).
1 (2 kHz) 1 to max. setting
• Poor torque or speed
response
• Motor hunting and
oscillation
Torque Compensation
Primary Delay Time
(C4-02)
• Reduce the setting if motor torque and speed response are too
slow.
• Increase the setting if motor hunting and oscillation occur.
200 ms 100 to 1000 ms
• Poor motor torque at
speeds below 10 Hz
• Motor hunting and
oscillation
Torque Compensation
Gain (C4-01)
• 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.
1.00 0.50 to 1.50
• Poor motor torque at
low speeds
• Motor instability at
motor start
Mid Output Voltage A
(E1-08)
Minimum Output
Voltage (E1-10)
• Increase the setting if motor torque is insufficient at speeds
below 10 Hz.
• Reduce the setting If motor instability occurs at motor start.
Depends on
o2-04, Drive
Model
Selection
Default setting
±5 V
Poor speed precision
(V/f control)
Slip Compensation Gain
(C3-01)
Set the motor-rated current (E2-01), motor-rated slip (E2-02),
and motor no-load current (E2-03), then adjust the slip
compensation gain (C3-01).
0.0
(no slip
compen-
sation)
0.5 to 1.5
u Parameters to Minimize Motor Hunting and Oscillation
In addition to the parameters discussed in table Table 6.1 , parameters in Table 6.2 indirectly affect motor hunting and
oscillation.
Table 6.2 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.
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 Filter Time Constant
(H3-13)
Prevents fluctuation in the analog input signal due to noise.
6.2 Motor Performance Fine-Tuning
290 YASKAWA SIEP YAIP1U 01B AC Drive - P1000 Technical Manual