YASKAWA GA800 Programming Manual page 505

• If too much current flows during acceleration, decrease the setting value.
Note:
When A1-02 = 8 [Control Method Selection = EZOLV], this parameter will always be in effect for speed ranges less than n7-10 [Pull-in
Current Switching Speed].
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n8-52: ACR P Gain
No.
Name
(Hex.)
n8-52 ACR P Gain
(053F)
Expert
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n8-54: Voltage Error Compensation Time
No.
Name
(Hex.)
n8-54 Voltage Error Compensation
Time
(056D)
Expert
Adjust this parameter in these conditions:
• If oscillation occurs at the time of start up, increase the setting value.
• If hunting occurs when operating at low speed, increase the setting value.
• If fast changes in the load cause hunting, increase the setting value in 0.1-unit increments. If you cannot stop
hunting, set n8-51 [Pull-in Current @ Acceleration] to 0% and set n8-54 to 0.00 s, and disable compensation for
voltage errors.
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n8-55: Motor to Load Inertia Ratio
No.
Name
(Hex.)
n8-55 Motor to Load Inertia Ratio
(056E)
Adjust in the following situations.
• If torque and speed response is unsatisfactory, gradually increase the setting from 0.
• If the motor does not run smoothly, gradually increase the setting from 0.
• If the motor stalls during run at constant speed, gradually increase the setting from 0.
• If there is vibration or hunting, decrease the setting.
Note:
• If the value is set too low, the drive will detect STPo [Motor Step-Out Detected].
• If you use one motor or more than motor at low inertia and the value is too high, there can be vibration in the motor.
0 : Below 1:10
Use this setting in these conditions:
• The ratio between the motor inertia and machine inertia is less than 1:10
• There are large current ripples
1 : Between 1:10 and 1:30
Use this setting in these conditions:
• The ratio between the motor inertia and machine inertia is approximately 1:10 to 1:30
• Parameter n8-55 = 0 and the drive detects STPo because of an impact load or sudden acceleration/deceleration.
2 : Between 1:30 and 1:50
Use this setting in these conditions:
• The ratio between the motor inertia and machine inertia is approximately 1:30 to 1:50
• Parameter n8-55 = 1 and the drive detects STPo because of an impact load or sudden acceleration/deceleration.
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
V/f CL-V/f OLV CLV AOLV
Sets the proportional gain of the current regulator. Usually it is not necessary to change this setting.
V/f CL-V/f OLV CLV AOLV
Sets the time constant that the drive uses when adjusting for voltage errors.
V/f CL-V/f OLV CLV AOLV
Sets the ratio between motor inertia and machine inertia.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
2.10 n: Special Adjustment
Default
(Range)
10.0
(-100.0 - 100.0)
Default
(Range)
1.00 s
(0.00 - 10.00 s)
Default
(Range)
0
(0 - 3)
2
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