5.9 n: Special Adjustments
YASKAWA ELECTRIC
SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
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n8-49: d Axis Current for High Efficiency Control (for PM OLV)
Sets the amount of d axis current when using Energy Saving control as a percentage of the motor rated current.
Although this setting seldom needs to be changed, please note the following:
• If motor operation is unstable when driving heavy loads, try increasing this setting (towards 0).
• If motor parameters (E5) have been changed, this value will be reset to 0 and has to be readjusted.
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n8-50: Heavy Load Current Level (for PM OLV)
Sets the load level to begin high-efficiency control of an IPM motor.
Note: 1.
This parameter is valid from software version 6002 or later.
2.
An Operator Programming Error (oPE) occurs if the setting value deviates from the following condition: n8-74
≤
n8-75
≤
n8-50.
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n8-51: Acceleration/Deceleration Pull-In Current (for PM OLV)
Sets the d-axis current during acceleration and deceleration as a percentage of the motor rated current (E5-03).
Adjustments to this setting may help in the following situations:
• Increase this setting when a large amount of starting torque is required.
• Lower this setting if there is excessive current during acceleration and deceleration.
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n8-54: Voltage Error Compensation Time Constant (for PM OLV)
Sets the time constant for voltage error compensation. Make changes to this parameter under the following conditions:
• Adjust the value when hunting occurs at low speed.
• Increase the value in steps of 0.1 when hunting occurs with sudden load changes. Try to disable the compensation by
setting n8-51 = 0 if increasing does not help.
• Increase the value when oscillations occur at start.
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n8-55: Load Inertia (for PM OLV)
Sets the ratio between motor inertia and the inertia of the connected machinery. If this value is set too low, the motor may
not start very smoothly, and a STo fault (Motor Step-Out) might occur.
Setting 0: Below 1:10
The inertia ratio between the motor and the load is just less than 1:10.
Setting 1: Between 1:10 and 1:30
The inertia ratio between the motor and the load is between 1:10 and 1:30. Set n8-55 to 1 if a STo fault occurs as a result
of impact load or sudden acceleration/deceleration when n8-55 = 0.
No.
<1> Setting range varies by the software version the drive is running. Software versions 6002 or later allow n8-49 to be changed during run.
Software versions 6002 or later: -200.0 to 200.0%
Software versions 6001 or earlier: -200.0 to 0.0%
Name
Setting Range
Default
n8-49
d Axis Current for High Efficiency Control
50%
No.
Name
Setting Range
Default
n8-50
Heavy Load Current Level
50 to 255%
80%
No.
Name
Setting Range
Default
n8-51
Acceleration/Deceleration Pull-In Current
0 to 200%
50%
No.
Name
Setting Range
Default
n8-54
Voltage Error Compensation Time Constant
0.00 to 10.00 s
1.00 s
No.
Name
Setting Range
Default
n8-55
Load Inertia
0 to 3
0
