Motor Performance Fine Tuning; Motor Performance Fine Tuning; V/F Motor Control Method Tuning; Open Loop Vector (Olv) Motor Control Method Tuning - YASKAWA V1000 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 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.

V/f Motor Control Method Tuning

u
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
• Poor motor instability at motor start
• Poor speed precision
<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

Problem
• Poor motor torque and speed response
• Control motor hunting and oscillation at
speeds between 10 and 40 Hz.
• Poor motor torque and speed response
• Control motor hunting and oscillation at
speeds between 10 and 40 Hz.
• Overvoltage trips when accelerating,
decelerating, or during sudden speed or load
changes.
• Poor motor torque and speed response
• Motor hunting and oscillation.
• Overvoltage trips when accelerating,
decelerating, or during sudden speed or load
changes
• Poor speed response and stability
• Poor speed precision
• Motor noise
• Control motor hunting and oscillation occur
at speeds below 10 Hz.
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Table 6.1 Parameters for Tuning the Drive in V/f Motor Control Method
Parameter No.
• If insufficient motor torque relative to the size of the load causes hunting,
reduce the setting.
Hunting Prevention Gain
(n1-02)
• When motor hunting and oscillation occur with a light load, increase the
setting.
• 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 Selection
carrier frequency.
(C6-02)
• The default setting for the carrier frequency depends on the drive capacity (
o2-04) and the Drive Duty Selection (C6-01).
• If motor torque and speed response are too slow, decrease the setting.
Torque Compensation
Primary Delay Time (C4-02)
• If motor hunting and oscillation occur, increase the setting.
• 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 torque (E2-01), motor-rated slip (E2-02) and
(C3-01) motor no-load current (E2-03), adjust the slip compensation gain (C3-01).
Table 6.2 Parameters for Tuning the Drive in OLV Motor Control Method
Parameter No.
• If motor torque and speed response are too slow, gradually
decrease the setting by 0.05.
AFR Gain
(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.
• If motor hunting and oscillation occur as a result of load inertia,
AFR Time Constant 1
gradually increase the setting by 50 ms and check the performance.
(n2-02)
Note: Ensure that n2-02 ≤ n2-03. When making adjustments to n2-02,
set C4-02 (Torque Compensation Primary Delay Time Constant 1)
accordingly.
• If overvoltage trips 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.
• To improve motor torque speed response, gradually reduce this
setting by 2 ms and check the performance.
Torque Compensation Primary
• If motor hunting and oscillation occur, gradually increase this
Delay Time Constant 1
setting by 10 ms.
(C4-02)
Note: Ensure that C4-02 ≤ C4-06. When making adjustments to
C4-02, increase n2-02 (AFR Time Constant) 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
Torque Compensation Primary
the 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.
• If response is slow, gradually decrease the setting by 10 ms.
Slip Compensation Primary
Delay Time Constant (C3-02)
• If speed is unstable, gradually increase the setting by 10 ms.
• If speed is too slow, gradually increase the setting by 0.1 ms.
Slip Compensation Gain
(C3-01)
• If speed is too fast, gradually decrease the setting by 0.1 ms.
• 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 Selection
carrier frequency.
(C6-02)
• The default setting for the carrier frequency depends on the drive
capacity (o2-04) and Drive Duty Selection (C6-01).
Countermeasure
Countermeasure
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Default
Suggested Setting
Value
1.00 0.50 to 2.00
7 (Swing PWM
1 to A
1)
200 ms 100 to 1000 ms
<1>
1.00 0.50 to 1.50
E1-08: 16.0
VE1-10: 12.0 Initial value ±5 V
V
- 0.5 to 1.5
Default Value Suggested Setting
1.00 0.50 to 2.00
50 ms 50 to 2000 ms
750 ms 750 to 2000 ms
20 ms 20 to 100 ms
<1>
150 ms 150 to 750 ms
200 ms 100 to 500 ms
<1>
1.0 0.5 to 1.5
<1>
7 (Swing PWM 1) 0 to the default setting