Motor Performance Fine-Tuning; Fine-Tuning V/F Control And V/F Control With Pg; Fine-Tuning Open Loop Vector Control - YASKAWA A1000 Series 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 and V/f Control with PG

Table 6.1 Parameters for Fine-Tuning Performance in V/f and V/f w/PG
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
Poor speed precision (V/f control)
Poor speed precision (V/f control with
PG)
<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.
<3> ASR in V/f Control with PG only controls the output frequency, and therefore does not allow the high gain settings possible when using Close
Loop Vector control.
<4> Refer to C5: Automatic Speed Regulator (ASR) on page 171

◆ Fine-Tuning Open Loop Vector Control

Problem
• Poor motor torque and speed
response
• Motor hunting and oscillation at
speeds between 10 and 40 Hz
• Poor motor torque and speed
response
• Motor hunting and oscillation at
speeds between 10 and 40 Hz
Overvoltage trips when accelerating,
decelerating, or during sudden speed or
load changes.
296
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) and the Duty Selection (C6-01).
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.
Slip Compensation Gain After setting the motor-rated current (E2-01), motor-rated slip (E2-02), and
(C3-01) motor no-load current (E2-03), adjust the slip compensation gain (C3-01).
ASR Proportional Gain 1 (C5-01)
Adjust the ASR proportional gain 1 (C5-01) and the ASR integral time 1
ASR Integral Time 1 (C5-02)
(C5-02).
<3> <4>
Table 6.2 Parameters for Fine-Tuning Performance in OLV
Parameter No.
• If motor torque and speed response are too slow, gradually decrease the
AFR Gain setting by 0.05.
(n2-01) • If motor hunting and oscillation occur, gradually increase the setting by
0.05.
• To improve motor torque speed response, gradually reduce this setting by
10 ms and check the performance.
AFR Time Constant 1 • If motor hunting and oscillation occur as a result of load inertia, gradually
(n2-02) increase the setting by 50 ms and check the performance.
Note: Ensure that n2-02 ≤ n2-03. When changing n2-02, set C4-02 (Torque
Compensation Primary Delay Time Constant 1) accordingly.
• If overvoltage occur, gradually increase this setting by 50 ms.
• If response is slow, gradually reduce this setting by 10 ms.
AFR Time Constant 2
Note: Ensure that n2-02 ≤ n2-03. When making adjustments to n2-03,
(n2-03)
increase the value of C4-06 (Torque Compensation Primary Delay Time 2)
proportionally.
• If overvoltage trips occur, gradually increase this setting by 10 ms and
check the performance.
• If response is slow, gradually reduce this setting by 2 ms and check the
Torque Compensation Primary
performance.
Delay Time Constant 2 (C4-06)
Note: Ensure that C4-02 ≤ C4-06. When changing C4-06 (Torque
Compensation Primary Delay Time Constant 2), increase the value of n2-03
proportionally.
Corrective Action
for details on Automatic Speed Regulator (ASR).
Corrective Action
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 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>
0.0
(no slip 0.5 to 1.5
compensation)
Proportional gain
C5-01: 0.20 = 0.10 to 1.00
C5-02: 0.200 Integral time
= 0.100 to 2.000
Suggested
Default
Setting
1.00 0.50 to 2.00
50 ms 50 to 2000 ms
750 ms 750 to 2000 ms
150 ms 150 to 750 ms