YASKAWA GA700 Series Technical Manual page 635

While in Closed Loop V/f Control, continue to use default settings for C5-01 to C5-05 [ASR Parameters].
Significantly altering the default settings will likely cause oscillation.
Table 12.19 Adjustment of Drive Control (V/f Control and Closed Loop V/f Control Methods)
Adjustment description
• Prevent hunting and
n1-02 [Hunting Prevention Gain
oscillation at middle-range
Setting]
speeds (10 Hz to 40 Hz)
• Increasing motor excitation
sound
C6-02 [Carrier Frequency
• Hunting and oscillation
Selection]
suppression at low speeds and
middle-range speeds
• Increase torque at low speeds
(10 Hz or lower)
C4-01 [Torque Compensation
Gain]
• Prevent hunting and
oscillation
E1-08 [Mid Point A Voltage]
• Increase torque at low speeds
E1-10 [Minimum Output Voltage]
• Prevent shock during start up
*1 The default setting changes when the settings for C6-01 [Normal / Heavy Duty Selection] and o2-04 [Drive Model (KVA) Selection]
change.
*2 The default setting changes when the settings for A1-02 [Control Method Selection] and E1-03 [V/f Pattern Selection] change.
*3 This is the setting for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.
Open Loop Vector Control Method
Do not adjust parameter C4-01 [Torque Compensation Gain]. Keep this parameter at its default setting.
If you cannot get speed accuracy during regeneration, set C3-04 = 1 [Slip Compensation at Regen = Enabled
Above 6Hz]. If you cannot get speed accuracy at high speeds, set C3-05 = 1 [Output Voltage Limit Selection =
Enabled].
Table 12.20 Adjustment of Drive Control (Open Loop Vector Control Method)
Adjustment description
• Torque, increase speed
response
n2-01 [Automatic Freq Regulator
• Prevent hunting and
Gain]
oscillation at middle-range
speeds (10 Hz to 40 Hz)
• Torque, increase speed
response
C4-02 [Torque Compensation
Delay Time]
• Prevent hunting and
oscillation
• Increase speed response
C3-02 [Slip Compensation Delay
Time]
• Increase speed stability
• Improve speed accuracy C3-01 [Slip Compensation Gain]
• Increasing motor excitation
sound
C6-02 [Carrier Frequency
• Prevent hunting and
Selection]
oscillation at low-range speeds
(10 Hz to or lower)
E1-08 [Mid Point A Voltage]
• Increase torque and speed
response at low speeds
E1-10 [Minimum Output Voltage]
• Prevent shock during start up
*1 If the value for C4-02 [Torque Compensation Delay Time] is high, the current can increase during start up. Adjust and check the
current during start up.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Parameter Number Possible Solutions
• If the torque is not sufficient
with heavy loads, decrease the
setting.
• If there is hunting or
oscillation with light loads,
increase the setting.
• If there is a loud motor
excitation sound, increase the
setting value.
• If there is hunting or
oscillation at low speeds or
middle-range speeds, decrease
the setting value.
• If the torque is not sufficient at
low speeds, increase the
setting value.
• If there is hunting or
oscillation with light loads,
decrease the setting value.
• If the torque is not sufficient at
low speeds, increase the
setting value.
• If there is a large shock during
start up, decrease the setting
value.
Parameter Number Possible Solutions
• If torque and speed response
are slow, decrease the setting
value.
• If there is hunting or
oscillation, increase the setting
value.
• If torque and speed response
are slow, decrease the setting
value.
*1
• If there is hunting or
oscillation, increase the setting
value.
• When speed response is slow,
decrease the setting value.
• If speed is not stable, increase
the setting value.
• If speed is too slow, increase
the setting value.
• If speed is too fast, decrease
the setting value.
• If there is a loud motor
excitation sound, increase the
setting value.
• If there is hunting or
oscillation at low speeds,
decrease the setting value.
• If the torque and speed
response are slow, increase the
setting value.
• If there is a large shock during
start up, decrease the setting
value.
12.2 A: Initialization Parameters
Default Recommended Setting
1.00 0.50 - 2.00
*1
1.00 0.50 - 1.50
*2 *3
15.0 V 13.0 V to 16.0 V
*2 *3
9.0 V 7.0 V to 10.0 V
Default Recommended Setting
1.00 0.50 - 2.00
20 ms 20 ms to 100 ms
200 ms 100 ms to 500 ms
1.0 0.5 - 1.5
*2
*3
11.0 V 12.0 V to 13.0 V
*3
2.0 V 2.0 V to 3.0 V
1 - F
*3
*3
1 - F
*3
*3
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