6.2 Motor Performance Fine Tuning
This section offers helpful information for counteracting oscillation, hunting, or other faults 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. Consult Yaskawa for more information on detailed settings and fine-tuning the drive.
u
V/f Motor Control Method Tuning
Table 6.1 Parameters for Tuning the Drive in V/f Motor Control Method
Problem Parameter No. Countermeasure
Default
Value
Suggested Setting
• Motor hunting and oscillation at speeds
between 10 and 40 Hz
Hunting Prevention Gain
(n1-02)
• 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
setting.
1.00 0.50 to 2.00
• Motor noise
• Motor hunting and oscillation at speeds
up to 40 Hz
Carrier Frequency Selection
(C6-02)
• If the motor noise is too loud, increase the carrier frequency.
• When motor hunting and oscillation occur at speeds up to 40 Hz, lower the
carrier frequency.
• The default setting for the carrier frequency depends on the drive capacity (
o2-04) and the Drive Duty Selection (C6-01).
7 (Swing PWM
1)
1 to A
• Poor torque or speed response
• Motor hunting and oscillation
Torque Compensation
Primary Delay Time (C4-02)
• If motor torque and speed response are too slow, decrease the setting.
• If motor hunting and oscillation occur, increase the setting.
200 ms <1> 100 to 1000 ms
• Poor motor torque at speeds below 10 Hz
• Motor hunting and oscillation
Torque Compensation Gain
(C4-01)
• If motor torque is insufficient at speeds below 10 Hz, increase the setting.
• If motor hunting and oscillation with a relatively light load, decrease the
setting.
1.00 0.50 to 1.50
• Poor motor torque at low speeds
• Poor motor instability at motor start
Mid Output Voltage A
(E1-08)
Minimum Output Voltage
(E1-10)
• If torque is insufficient at speeds below 10 Hz, increase the setting.
• If motor instability occurs at motor start, decrease the setting.
Note: The recommended setting value is for 200 V class drives. Double this
value when using a 400 V class drive.
E1-08: 16.0
VE1-10: 12.0
V
Initial value ±5 V
• Poor speed precision
Slip Compensation Gain
(C3-01)
• After setting the motor-rated torque (E2-01), motor-rated slip (E2-02) and
motor no-load current (E2-03), adjust the slip compensation gain (C3-01).
- 0.5 to 1.5
<1> Default settings change when the Control Method is changed (A1-02) or a different V/f pattern is selected using parameter E1-03. The default setting shown is for V/f Control.
Note: Use slip compensation to improve speed precision in V/f Control. First make sure that the proper values have been set for the motor rated current to E2-01, motor rated slip
(E2-02), and motor no-load current (E2-03). Next, adjust the slip compensation gain set to C3-01 so that it is between 0.5 to 1.5.
u
Open Loop Vector (OLV) Motor Control Method Tuning
Table 6.2 Parameters for Tuning the Drive in OLV Motor Control Method
Problem Parameter No. Countermeasure Default Value Suggested Setting
• Poor motor torque and speed response
• Control motor hunting and oscillation at
speeds between 10 and 40 Hz.
AFR Gain
(n2-01)
• If motor torque and speed response are too slow, gradually
decrease the setting by 0.05.
• If motor hunting and oscillation occur, gradually increase the
setting by 0.05.
1.00 0.50 to 2.00
• Poor motor torque and speed response
• Control motor hunting and oscillation at
speeds between 10 and 40 Hz.
AFR Time Constant 1
(n2-02)
• To improve motor torque speed response, gradually reduce this
setting by 10 ms and check the performance.
• If motor hunting and oscillation occur as a result of load inertia,
gradually increase the setting by 50 ms and check the performance.
Note: Ensure that n2-02 ≤ n2-03. When making adjustments to n2-02,
set C4-02 (Torque Compensation Primary Delay Time Constant 1)
accordingly.
50 ms 50 to 2000 ms
• Overvoltage trips when accelerating,
decelerating, or during sudden speed or load
changes.
AFR Time Constant 2
(n2-03)
• If overvoltage trips occur, gradually increase this setting by 50 ms.
• If response is slow, gradually reduce this setting by 10 ms.
Note: Ensure that n2-02 ≤ n2-03. When making adjustments to n2-03,
increase the value of C4-06 (Torque Compensation Primary Delay
Time 2) proportionally.
750 ms 750 to 2000 ms
• Poor motor torque and speed response
• Motor hunting and oscillation.
Torque Compensation Primary
Delay Time Constant 1
(C4-02)
• To improve motor torque speed response, gradually reduce this
setting by 2 ms and check the performance.
• If motor hunting and oscillation occur, gradually increase this
setting by 10 ms.
Note: Ensure that C4-02 ≤ C4-06. When making adjustments to
C4-02, increase n2-02 (AFR Time Constant) proportionally.
20 ms <1> 20 to 100 ms
• Overvoltage trips when accelerating,
decelerating, or during sudden speed or load
changes
Torque Compensation Primary
Delay Time Constant 2 (C4-06)
• 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 performance.
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.
150 ms 150 to 750 ms
• Poor speed response and stability
Slip Compensation Primary
Delay Time Constant (C3-02)
• If response is slow, gradually decrease the setting by 10 ms.
• If speed is unstable, gradually increase the setting by 10 ms.
200 ms <1> 100 to 500 ms
• Poor speed precision
Slip Compensation Gain
(C3-01)
• If speed is too slow, gradually increase the setting by 0.1 ms.
• If speed is too fast, gradually decrease the setting by 0.1 ms.
1.0 <1> 0.5 to 1.5
• Motor noise
• Control motor hunting and oscillation occur
at speeds below 10 Hz.
Carrier Frequency Selection
(C6-02)
• If there is too much motor noise, the carrier frequency is too high.
• If motor hunting and oscillation occur at low speeds, reduce the
carrier frequency.
• The default setting for the carrier frequency depends on the drive
capacity (o2-04) and Drive Duty Selection (C6-01).
7 (Swing PWM 1) 0 to the default setting
6.2 Motor Performance Fine Tuning
224
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
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