Parameter Details
12
12.2 b: APPLICATION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 559
Decrease the setting value to increase responsiveness to load changes. If you set the value too low during
operation at light loads, motor speed is not stable.
■ b8-06 Srch Op.Volt Limit
No.
(Hex.)
Name Description
Default
(Range)
b8-06
(01D1)
Expert
Srch Op.Volt Limit
Sets the voltage limit for Search Operation as a percentage where motor rated voltage is a setting
value of 100%.
0%
(0 - 100%)
The Search Operation changes the output voltage in small increments to find a setpoint at which the drive can use
minimum power to operate.
Set this parameter to 0 to disable Search Operation. This will not disable Energy-saving control.
If the setting value is too low, the motor will stall when loads suddenly increase.
■ b8-16 PM eSave Coef.Ki
No.
(Hex.)
Name Description
Default
(Range)
b8-16
(01F8)
Expert
PM eSave Coef.Ki
Sets torque linearity. This parameter uses the Ki value from the motor nameplate. Usually it is not
necessary to change this setting.
1.00
(0.00 - 3.00)
When b8-16 = 1.00 (default), the drive will automatically calculate and control the energy-saving coefficient. If
the motor nameplate has a description for “Ki”, set this parameter to the Ki value.
Do this procedure to prevent oscillation when you set b8-01 = 1 [eSave Ctrl Selection = Enabled].
1. Check U5-21 [Energy Save Ki Coeff] and make sure that it aligns with the Ki value on the motor nameplate.
2. If the numbers are different, set b8-16 to the Ki value on the motor nameplate.
■ b8-17 PM eSave Coef.Kt
No.
(Hex.)
Name Description
Default
(Range)
b8-17
(01F9)
Expert
PM eSave Coef.Kt
Sets torque linearity. This parameter uses the Kt value from the motor nameplate. Usually it is not
necessary to change this setting.
1.00
(0.00 - 3.00)
When E5-01 = 1xxx, 2xxx [PM Mot Code Selection = Yaskawa SSR1 or SST4 series IPM motor], the drive
automatically calculates the energy-saving coefficient Kt and uses that value to control operation.
Do this procedure to prevent oscillation when you set b8-01 = 1 [eSave Ctrl Selection = Enabled].
1. Check U5-22 [Energy Save Kt Coeff] and make sure that it aligns with the Kt value on the motor nameplate.
2. If the numbers are different, set b8-17 to the Kt value on the motor nameplate.
■ b8-18 eSave d-Axis Filter Time
No.
(Hex.)
Name Description
Default
(Range)
b8-18
(01FA)
Expert
eSave d-Axis Filter Time
Sets the d-axis current reference filter time constant.
100 ms
(0 - 5,000 ms)
■ b8-19 eSave Search Frequency
No.
(Hex.)
Name Description
Default
(Range)
b8-19
(0B40)
Expert
eSave Search Frequency
Sets the frequency of Energy-saving control search operations. Usually it is not necessary to
change this setting.
Determined by A1-02
(20 - 300 Hz)
Note:
• If low inertia causes vibration in the machine, increase the setting value in 10 Hz increments and check the response. If A1-02 = 8
[Control Method = EZ Vector], increase the setting value in 1 Hz increments.
• To make the motor more efficient, decrease the setting value in 1 Hz increments until the point immediately before machine vibration
starts to occur.
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