D6: Field Weakening And Field Forcing - YASKAWA U1000 Series Technical Manual

5.4 d: Reference Settings
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
No.
d5-05
d5-06: Speed/Torque Control Switchover Time

Sets the delay time for switching from Speed Control to Torque Control and vice versa.
No.
d5-06
d5-08: Unidirectional Speed Limit Bias

Parameter d5-08 selects how the speed limit bias is applied.
No.
d5-08
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 drive
maximum output voltage.
No.
d6-01
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.
No.
d6-02
204
Parameter Name
Speed Limit Bias
Parameter Name
Speed/Torque Control Switchover Time
Parameter Name
Unidirectional Speed Limit Bias
Parameter Name
Field Weakening Level
Parameter Name
Field Weakening Frequency Limit
202.
Setting Range
Setting Range
Setting Range
Setting Range
Setting Range
0 to 400.0 Hz
YASKAWA ELECTRIC SIEP C710636 03A YASKAWA U1000 Technical Manual
Default
0 to 120%
Default
0 to 1000 ms
Default
0 or 1
Default
0 to 100%
Default
10%
0 ms
1
80%
0.0 Hz