Motor Performance Fine-Tuning; Motor Performance Fine-Tuning; Fine-Tuning V/F Control; Fine-Tuning Open Loop Vector Control For Pm Motors - YASKAWA E1000 Technical Manual

6.2 Motor Performance Fine-Tuning

6.2

Motor Performance Fine-Tuning

This section offers helpful information for counteracting oscillation, hunting, or 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 parameters that are commonly edited and may be set incorrectly. Consult Yaskawa for more information
on detailed settings and fine-tuning the drive.

◆ Fine-Tuning V/f Control

Problem
Motor hunting and oscillation at speeds
between 10 and 40 Hz
• Motor noise
• Motor hunting and oscillation at
speeds up to 40 Hz
• Poor torque or speed response
• Motor hunting and oscillation
• Poor motor torque at speeds below 10
Hz
• Motor hunting and oscillation
• Poor motor torque at low speeds
• Motor instability at motor start
<1> Default setting value is dependent on parameter A1-02, Control Method Selection, and o2-04, Drive Model Selection.
<2> Default settings change when the Control Method is changed (A1-02) or a different V/f pattern is selected using parameter E1-03.

◆ Fine-Tuning Open Loop Vector Control for PM Motors

Problem
Motor performance not as desired
Poor motor torque and speed response
Oscillation at start or the motor stalls
Stalling or oscillation occur when load
is applied during constant speed
Hunting or oscillation occur
STO fault trips even if the load is not
too high
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Table 6.1 Parameters for Fine-Tuning Performance in V/f
Parameter No.
• If insufficient motor torque relative to the size of the load causes hunting,
reduce the setting.
• When motor hunting and oscillation occur with a light load, increase the
Hunting Prevention Gain
setting.
(n1-02)
• Lower this 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.
• If the motor noise is too loud, increase the carrier frequency.
• When motor hunting and oscillation occur at speeds up to 40 Hz, lower
Carrier Frequency Selection
the carrier frequency.
(C6-02)
• The default setting for the carrier frequency depends on the drive
capacity (o2-04).
Torque Compensation Primary
• If motor torque and speed response are too slow, decrease the setting.
Delay Time
• If motor hunting and oscillation occur, increase the setting.
(C4-02)
• If motor torque is insufficient at speeds below 10 Hz, increase the setting.
Torque Compensation Gain
• If motor hunting and oscillation with a relatively light load, decrease the
(C4-01)
setting.
• If torque is insufficient at speeds below 10 Hz, increase the setting.
Mid Output Voltage A (E1-08)
• If motor instability occurs at motor start, decrease the setting.
Minimum Output Voltage
Note: The recommended setting value is for 200 V class drives. Double this
(E1-10)
value when using a 400 V class drive.
Table 6.2 Parameters for Fine-Tuning Performance in OLV/PM
Parameter No.
• Check the settings for base and maximum frequency in the E1-
parameters
Motor parameters • Check E5- parameters and make sure all motor data has been set
(E1-, E5-) correctly. Be careful not to enter line to line data where single-phase data
is required, and vice versa.
• Perform Auto-Tuning.
Load Inertia Ratio (n8-55) Adjust parameter n8-55 to meet the load inertia ratio of the machine.
Speed Feedback Detection Gain
Increase the speed feedback detection gain (n8-45).
(n8-45)
Enable torque compensation.
Torque Compensation (C4-01) Note: Setting this value too high can cause overcompensation and motor
oscillation.
Pull-In Current during Accel/
Increase the pull-in current set in n8-51
Decel (n8-51)
DC Injection Braking Current
Use DC Injection Braking at start to align the rotor. Be aware that this
(b2-02), DC Injection Time at
operation can cause a short reverse rotation at start.
Start (b2-03)
Increase the load inertia ratio.
Load Inertia Ratio (n8-55) Note: Setting this value too high can cause overcompensation and motor
oscillation.
Pull-In Current Compensation
Decrease n8-47 if hunting occurs during constant speed
Time Constant (n8-47)
Pull-In Current (n8-48) Increase the pull-in current in n8-48.
Load Inertia Ratio (n8-55) Increase the load inertia ratio.
Speed feedback Detection Gain
Decrease the speed feedback detection gain in n8-45.
(n8-45)
• Check and adjust the induced voltage constant.
Induced Voltage Constant (E5-09
• Check the motor name plate, the data sheet or contact the motor
or E5-24)
manufacturer for getting data.
Corrective Action
Corrective Action
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
Suggested
Default
Setting
1.00 0.10 to 2.00
1 (2 kHz) 1 to max. setting
200 ms 100 to 1000 ms
<1>
1.00 0.50 to 1.50
E1-08: 15.0 V
Default setting
E1-10: 9.0 V
±5 V
<2>
Suggested
Default
Setting
– –
Close to the actual
0
load inertia ratio
Increase in
0.8
increments of 0.05
0 1
Increase in steps
50%
of 5%
b2-03 = 0.5 s
b2-02 = 50%
Increase b2-02 if
b2-03 = 0.0 s
needed
Close to the actual
0
load inertia ratio
Reduce in
5.0 s
increments of 0.2 s
Increase in
30%
increments of 5%
Close to the actual
0
load inertia ratio
Increase in
0.8
increments 0.05
dep. on drive Refer to the motor
capacity and data sheet or the
motor code nameplate.