YASKAWA GA700 Technical Manual page 585

Table 11.16 Adjustment of Drive Control (V/f Control and Closed Loop V/f Control Methods)
Adjustment Parameter Number
description
• Hunting and oscillation
suppression at middle- n1-02 [Hunting
range speeds (10 Hz to Prevention Gain Setting]
40 Hz)
• Increasing motor
excitation sound
C6-02 [Carrier Frequency
• Hunting and oscillation
Selection]
suppression at low
speeds and middle-
range speeds
• Increasing torque at
low speeds (10 Hz or
C4-01 [Torque
lower)
Compensation Gain]
• Hunting, oscillation
suppression
E1-08 [Mid Point A
Voltage]
• Increasing torque at
E1-10 [Minimum Output
low speeds
Voltage]
• Shock suppression
during startup
*1 The default setting differs depending on settings for C6-01 [Normal / Heavy Duty Selection] and o2-04 [Drive Model Selection].
*2 The default setting differs depending on settings for A1-02 [Control Method Selection] and E1-03 [V/f Pattern Selection].
*3 Set for 200 V class drives. Voltage is double for 400 V class drives.
Open Loop Vector Control Method
C4-01 [Torque Compensation Gain] should be left at its default setting. Do not adjust it.
If speed accuracy cannot be obtained during regeneration, set C3-04 = 1 [Slip Compensation @ Regen Select =
Enabled above 6 Hz]. If speed accuracy cannot be obtained at high speeds, set C3-05 = 1 [Output Voltage limit
Selection = Enabled].
Table 11.17 Adjustment of Drive Control (Open Loop Vector Control Method)
Adjustment Parameter Number
description
• Torque, increasing
speed response
n2-01
• Hunting and oscillation
[SpdFeedbackDetectCtr
suppression at middle-
(AFR) Gain]
range speeds (10 Hz to
40 Hz)
• Torque, increasing
C4-02 [Torque
speed response
Compensation Delay
• Hunting, oscillation
Time]
suppression
• Increasing speed
C3-02 [Slip
response
Compensation Delay
• Improving speed
Time]
stability
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Solution
• Reduce the setting
when torque is
insufficient with heavy
loads.
• If hunting, oscillation
occurs with light loads,
increase the setting.
• Increase the setting
value if there is a
marked motor
excitation sound.
• If hunting and
oscillation occurs at
low speeds and middle-
range speeds reduce the
setting value.
• Increase the setting
value when torque is
insufficient at low
speeds.
• If hunting, oscillation
occurs with light loads,
reduce the setting
value.
• Increase the setting
value when torque is
insufficient at low
speeds.
• Reduce the setting
value if there is marked
shock during drive
startup.
Solution
• Reduce the setting
value when torque and
speed response are
slow.
• If hunting, oscillation
occurs, increase the
setting value.
• Reduce the setting
value when torque and
speed response are
slow.
*1
• If hunting, oscillation
occurs, increase the
setting value.
• Reduce the setting
value when speed
response is slow.
• Increase the setting
value if speed is not
stable.
11.2 A: Initialization Parameters
Default Setting Suggested Setting
1.00
*1
1.00
15.0 V 13.0 V to 16.0 V
*2 *3
9.0 V 7.0 V to 10.0 V
*2 *3
Default Setting Suggested Setting
1.00
20 ms 20 - 100 ms
200 ms 100 - 500 ms
0.50 - 2.00
1 - F
0.50 - 1.50
*3
*3
0.50 - 2.00
11
585