YASKAWA CIPR-GA50C series Technical Manual page 723

• Increase the setting value in steps of 5% if the motor stalls during run at constant speed.
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n8-49: Heavy Load Id Current
No.
Name
(Hex.)
n8-49 Heavy Load Id Current
(053C)
RUN
Expert
When you use an IPM motor, you can use the reluctance torque of the motor to make the motor more efficient and
help conserve energy.
When you operate an SPN motor, set this parameter to 0.
Adjust in the following situations.
• If the load is large and motor rotation is not stable, decrease the setting value.
• When you change the E5 parameters [PM Motor Settings], set n8-49 = 0, then adjust this parameter.
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n8-50: Medium Load Iq Level (High)
No.
Name
(Hex.)
n8-50 Medium Load Iq Level
(High)
(053D)
Expert
■
n8-51: Pull-in Current @ Acceleration
No.
Name
(Hex.)
n8-51 Pull-in Current @
Acceleration
(053E)
Adjust in the following situations.
• When the motor does not smoothly because of large loads, increase the setting value in 5% increments.
• 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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n8-54: 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.
YASKAWA SIEPC71061753A GA500 Technical Manual
V/f OLV OLV/PM OLV/PM AOLV/PM EZOLV
Sets the d-axis current to that the drive will supply to the motor to run it at a constant speed with a
heavy load. Considers E5-03 [PM Motor Rated Current (FLA)] to be 100%. Usually it is not
necessary to change this setting.
V/f OLV OLV/PM OLV/PM AOLV/PM EZOLV
Sets the load current level at which heavy load control starts where E5-03 [Motor Rated Current
(FLA)] is 100%. Usually it is not necessary to change this setting.
V/f OLV OLV/PM OLV/PM AOLV/PM EZOLV
Sets the pull-in current allowed to flow during acceleration/deceleration as a percentage of the
motor rated current.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the time constant that the drive uses when adjusting for voltage errors.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the ratio between motor inertia and machine inertia.
12.10 n: Special Adjustment
Description
Description
Description
Description
Description
Default
(Range)
Determined by E5-01
(-200.0 - +200.0%)
Default
(Range)
80%
(50 - 255)
Default
(Range)
Determined by A1-02
(0 - 200%)
Default
(Range)
1.00 s
(0.00 - 10.00 s)
Default
(Range)
0
(0 - 3)
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