Fine-Tuning Open Loop Vector Control For Pm Motors - YASKAWA Z1000 User Manual

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Fine-Tuning Open Loop Vector Control for PM Motors

Problem Parameter No.
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)
Pull-In Current during
Accel/Decel (n8-51)
DC Injection Braking
Current (b2-02), DC
Oscillation at start or the
Injection Time at Start
motor stalls
(b2-03)
Load Inertia Ratio
(n8-55)
Pull-In Current
Compensation Time
Stalling or oscillation Constant (n8-47)
occur when load is
applied during constant Pull-In Current (n8-48)
speed
Load Inertia Ratio
(n8-55)
Hunting or oscillation Speed feedback
occur Detection Gain (n8-45)
STo fault trips when the Induced Voltage
load is not excessively Constant
high (E5-09 or E5-24)
Stalling or STo occurs at
high speed as the output Output Voltage Limit
voltage becomes (n8-62)
saturated
Oscillation at constant Output Voltage Limit
output when U6-02 Proportional Gain (for
displays -10% or more. PM Motors) (n8-63)
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
Table 5.2 Parameters for Fine-Tuning Performance in OLV/PM
• 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: Setting this value too high can cause
overcompensation and motor oscillation.
Increase the pull-in current in n8-51
Use DC Injection Braking at start to align the rotor. This may
cause a short reverse rotation at start.
Increase the load inertia ratio.
Note: Setting this value too high can cause
overcompensation and motor oscillation.
Reduce n8-47 if hunting occurs during constant speed
Increase the pull-in current in n8-48.
Increase the load inertia ratio.
Reduce the speed feedback detection gain in n8-45.
• Check and adjust the induced voltage constant.
• Check the motor nameplate and the data sheet or contact the
motor manufacturer.
Set the value of the input voltage to parameter n8-62
Decrease the output voltage limit proportional gain (n8-63).
Note: The speed response will be slow if the setting is
too low.
5.2 Motor Performance Fine-Tuning
Corrective Action
Suggested
Default
Setting
- -
Close to the actual
0
load inertia ratio
Increase in
0.80
increments of 0.05
0.00 1.00
Increase in steps
50%
of 5%
b2-03 = 0.5 s
b2-02 = 50%
Increase b2-02 if
b2-03 = 0.00 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
0.80
increments 0.05
Depends on Refer to the motor
drive data sheet or the
capacity nameplate.
200 Vac
(200 V class) Set equal to input
400 Vac voltage
(400 V class)
0.10 to 1.00
1.00 Decrease in
decrements of 0.1
201
5