Motor Performance Fine-Tuning; Motor Performance Fine-Tuning; Fine-Tuning V/F Control; Fine-Tuning Open Loop Vector Control For Pm Motors - YASKAWA Z1000 User Manual

5.2 Motor Performance Fine-Tuning

5.2

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.
u

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
Mid Output Voltage A
low speeds
(E1-08)
Minimum Output
• Motor instability at
Voltage (E1-10)
motor start
<1> Default setting value is dependent on parameter o2-04, Drive Model Selection.
u

Fine-Tuning Open Loop Vector Control for PM Motors

Problem
Undesirable motor Motor parameters
performance (E1-oo, E5-oo)
Load Inertia Ratio
(n8-55)
Speed Feedback
Poor motor torque and
Detection Gain (n8-45)
speed response
Torque Compensation
(C4-01)
194
Table 5.1 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.
Table 5.2 Parameters for Fine-Tuning Performance in OLV/PM
Parameter No.
• Check the settings for base and maximum frequency in the
E1-oo parameters.
• Check E5-oo parameters and set motor data correctly. Do
not enter line-to-line data where single-phase data is required,
and vice versa.
• Perform Auto-Tuning.
Adjust parameter n8-55 to meet the load inertia ratio of the
machine.
Increase the speed feedback detection gain (n8-45).
Enable torque compensation.
Note:
Corrective Action
Corrective Action
Setting this value too high can cause
overcompensation and motor oscillation.
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual
Suggested
Default
Setting
1.00 0.10 to 2.00
<1> 1 to max. setting
1 (2 kHz)
Depends on
o2-04, Drive
100 to 1000 ms
Model
Selection
1.00 0.50 to 1.50
Depends on
A1-02, Default setting
E1-03, and ±5 V
o2-04
Suggested
Default
Setting
- -
Close to the actual
0
load inertia ratio
Increase in
0.80
increments of 0.05
0.00 1.00