5.4 d: Reference Settings
192 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
■ d5-05: Speed Limit Bias
Using d5-05 a bias can be applied to the speed limit value. The bias is set as a percentage of the maximum output
frequency. Refer to Speed Limitation and Speed Limit Bias on page 190.
■
d5-06: Speed/Torque Control Switchover Time
Sets the delay time for switching from Speed Control to Torque Control and vice versa.
■
d5-08: Unidirectional Speed Limit Bias
Parameter d5-08 selects how the speed limit bias is applied.
Setting 0: Disabled
The speed limit bias is applied in both directions, the speed limit and the opposite direction.
Setting 1: Enabled
The speed limit bias is applied in the opposite direction of the speed limit only.
◆ 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.
■
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
maximum output voltage.
■
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.
■
d6-03: Field Forcing Selection
Enables or disables the Field Forcing function.
No. Parameter Name Setting Range Default
d5-05 Speed Limit Bias 0 to 120% 10%
No. Parameter Name Setting Range Default
d5-06 Speed/Torque Control Switchover Time 0 to 1000 ms 0 ms
No. Parameter Name Setting Range Default
d5-08 Unidirectional Speed Limit Bias 0 or 1 1
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
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