5.4 d: Reference Settings
162 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
u d6: Field Weakening and Field Forcing
Field Weakening
The Field Weakening function reduces the output voltage to a pre-defined level in order to reduce the energy
consumption of the motor. It can be activated using a digital input programmed for H1- = 63. Field Weakening
should only be used with a known and unchanging light load condition. Use the Energy Saving function (b8-
parameters) when Energy Saving for various different load conditions is required.
Field Forcing
The Field Forcing function compensates the delaying influence of the motor time constant when changing the excitation
current reference. Field Forcing can improve the motor responsiveness. It is ineffective during DC Injection Braking.
n
d6-01: Field Weakening Level
Sets the level to what the output voltage is reduced when Field Weakening is activated. Set as percentage of the drive
maximum output voltage.
n
d6-02: Field Weakening Frequency Limit
Sets the minimum output frequency for that field weakening can be activated. For frequencies below d6-02, Field
Weakening cannot be activated.
n
d6-03: Field Forcing Selection
Enables or disables the Field Forcing function.
Setting 0: Disabled
Setting 1: Enabled
n d6-06: Field Forcing Limit
Sets the maximum level to what the Field Forcing function can boost the excitation current reference. The value is set as
a percentage of the motor no load current.
Note: Adjustment is not normally required.
No. Parameter Name Setting Range Default
d6-01 Field Weakening Level 0 to 100% 80%
No. Parameter Name Setting Range Default
d6-02 Field Weakening Frequency Limit 0 to 400.0 Hz 0.0 Hz
No. Parameter Name Setting Range Default
d6-03 Field Forcing Selection 0 or 1 0
No. Parameter Name Setting Range Default
d6-06 Field Forcing Limit 100 to 400% 400%
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