YASKAWA GA700 Technical Manual page 893

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n8-55: Load Inertia
No.
Name
(Hex.)
n8-55 Load Inertia
(056E)
Adjust this parameter in the following circumstances.
• Gradually increase the setting value of 0 if responsiveness of torque and speed is poor.
• Gradually increase the setting value of 0 if motors do not start smoothly.
• Gradually increase the setting value of 0 if the motor stalls during run constant speed.
• Reduce the setting value if vibration or hunting issues occur.
Note:
• If the value is set too low, STPo [Pull-Out Detection] may be detected.
• Motors may vibrate if the setting value is too high when using a single motor or operating motors at low inertia.
0 : Below 1:10
Use this setting in the following scenarios.
• The ratio between the motor inertia and machine inertia is less than 1:10
• Current ripples are significant
1 : Between 1:10 and 1:30
Use this setting in the following scenarios.
• The ratio between the motor inertia and machine inertia is approximately between 1:10 to 1:30
• An STPo was detected as a result of impact load or sudden acceleration/deceleration when n8-55 = 0 was set.
2 : Between 1:30 and 1:50
Use this setting in the following scenarios.
• The ratio between the motor inertia and machine inertia is approximately between 1:30 to 1:50
• An STPo was detected as a result of impact load or sudden acceleration/deceleration when n8-55 = 1 was set.
3 : Beyond 1:50
Adjust this parameter in the following circumstances.
• The ratio between the motor inertia and machine inertia is over 1:50.
• An STPo was detected as a result of impact load or sudden acceleration/deceleration when n8-55 = 2 was set.
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n8-57: High Frequency Injection
No.
Name
(Hex.)
n8-57 High Frequency
Injection
(0574)
Note:
• Excitation sound will be generated from the motor when high frequency injection is carried out.
• Set E1-09 [Minimum Output Frequency] = 0.0 when using Zero Speed Control.
0 : Disabled
Set this parameter to 0 when using SPM motors. The speed control range is approximately 1:20.
When n8-57 = 0 is set, E1-09 [Minimum Output Frequency] cannot be set to a value that is less than or equal to 1/
20 of the value of E1-06 [Base Frequency].
1 : Enabled
Set this parameter to 1 when using IPM motors. The speed control range changes to 1:100, which enables highly
accurate speed detection.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
V/f CL-V/f OLV CLV AOLV
This parameter sets the ratio between motor inertia and machine inertia.
V/f CL-V/f OLV CLV AOLV
Selects whether to perform a high frequency injection to detect motor speed.
11.10 n: Special Adjustment
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default Setting
(Range)
0
(0 - 3)
Default
(Range)
0
(0, 1)
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