Fine-Tuning Open Loop Vector Control For Pm Motors; Fine-Tuning Advanced Open Loop Vector Control For Pm Motors - YASKAWA T1000A Technical Manual

6.2 Motor Performance Fine-Tuning
u 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
Stalling or STO occurs at high speed as
the output voltage becomes saturated.
When using OLV/PM, leave the torque compensation gain (C4-01) of its default setting of 1.00. Enable the slip
compensation selection during regeneration (C3-04 = 1) if speed precision is not possible during the regeneration.
u Fine-Tuning Advanced Open Loop Vector Control for PM Motors
Problem
• Poor torque or speed response
• Motor hunting and oscillation
• Poor torque or speed response
• Motor hunting and oscillation
Trouble maintaining the ASR
proportional gain or the integral time at
the low or high end of the speed range
Motor hunting and oscillation
Motor stalling makes normal operation
impossible
<1> Optimal settings will differ between no-load and loaded operation.
270
Table 6.4 Parameters for Fine-Tuning Performance in OLV/PM
Parameter No.
• Check the settings for base and maximum frequency in the E1-
Motor parameters • Check E5-
(E1- , E5- )
• 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
Decrease 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
Increase 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)
Set the value of the input voltage to parameter n8-62.
Output Voltage Limit (n8-62)
Never set the value higher than the actual input voltage.
Table 6.5 Parameters for Fine-Tuning Performance in AOLV/PM
Parameter No.
High-speed: ASR Proportional • If motor torque and speed response are too slow, gradually increase the
Gain 1 (C5-01)
Low-speed: ASR Proportional • If motor hunting and oscillation occur, decrease the setting.
Gain 2 (C5-03) • Parameter C5-03 needs to be adjusted only if C5-05 > 0.
High-speed: ASR Integral Time 1
• If motor torque and speed response are too slow, decrease the setting.
(C5-02)
• If motor hunting and oscillation occur, increase the setting.
Low-speed: ASR Integral Time 2
• Parameter C5-03 needs to be adjusted only if C5-05 > 0
(C5-04)
ASR Gain Switching Frequency Have the drive switch between two different ASR proportional gain and
(C5-07) integral time settings based on the output frequency.
ASR Primary Delay Time
If the load is less rigid and subject to oscillation, increase this setting.
Constant (C5-06)
Motor parameters
Check the motor parameter settings.
(E1- , E5- )
Corrective Action
parameters
parameters and make sure all motor data has been set
correctly. Be careful not to enter line to line data where single-phase data
is required, and vice versa.
manufacturer for getting data.
Corrective Action
setting by 5.
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Suggested
Default
Setting
- -
Close to the actual
0
load inertia ratio
Decrease in
0.8
decrements 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
Refer to the motor
dep. on drive
capacity and data sheet or the
motor code nameplate.
Set the value lower
200 Vac or 400
than the actual
Vac
input voltage.
Suggested
Default
Setting
10.00 5.00 to 30.00
<1>
0.300 to
0.500 s
1.000 s
<1>
0.0% 0.0 to Max r/min
0.016 to
0.010 s
0.035 s
<1>
- -