D6: Field Weakening /Forcing - YASKAWA GA700 Technical Manual

Adjusts the margin for the speed limit.
■
d5-06: Speed/Torque Changeover Time
No.
Name
(Hex.)
d5-06 Speed/Torque
Changeover Time
(029F)
The analog input (torque reference, speed limit value) holds at the value when the drive switched between Speed
and Torque Control in the time of the Speed/Torque Changeover Timer. During this time, prepare to switch to an
external source.
■
d5-08: Uni-directional Speed Limit Bias
No.
Name
(Hex.)
d5-08 Uni-directional Speed
Limit Bias
(02B5)
0 : Disabled
The drive applies the speed limit bias in the speed limit direction and the opposite direction.
1 : Enabled
The drive applies the speed limit bias in the opposite direction of the speed limit only.
◆

d6: Field Weakening /Forcing

d6 parameters set the field weakening and field forcing functions.
The field weakening function decreases the energy consumption of the motor. It decreases the output voltage of
the drive to a set level. The function decreases the motor excitation current inversely proportional to speed in a
constant output range, and does not let the induced voltage of the motor become more than the power supply
voltage. To enable this function, set Field Weakening [H1-xx = 63] ON.
Note:
Use the Field Weakening function in constant light-load applications. To control the energy consumption of the motor for other load
conditions, use the b8 parameters [Energy Saving].
The Field Forcing function adjusts the delaying influence of the motor time constant when the drive changes the
excitation current reference and it also increases motor responsiveness. This function uses a high motor excitation
current reference for drive start-up only to help develop actual motor excitation current. Enable the Field Forcing
function to increase motor responsiveness.
Note:
You cannot use Field Forcing during DC Injection Braking.
■
d6-01: Field Weakening Level
No.
Name
(Hex.)
d6-01 Field Weakening
Level
(02A0)
■
d6-02: Field Weakening Frequency Limit
No.
Name
(Hex.)
d6-02 Field Weakening
Frequency Limit
(02A1)
Make sure that these two conditions are correct to enable the Field Weakening command:
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
V/f CL-V/f OLV CLV AOLV
Sets the delay time to switch between Speed Control and Torque Control.
Set H1-xx = 71 [MFDI Function Select = Torque Control] before you set
this parameter.
V/f CL-V/f OLV CLV AOLV
Sets the direction of the speed limit reference to which Speed Limit Bias
[d5-05] applies.
V/f CL-V/f OLV CLV AOLV
Sets the drive output voltage as a percentage of E1-05 [Maximum Output
Voltage] when H1-xx = 63 [Field Weakening] is activated.
V/f CL-V/f OLV CLV AOLV
Sets the minimum output frequency to start field weakening.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
11.5 d: References
Default
(Range)
0 ms
(0 - 1000 ms)
Default
(Range)
1
(0, 1)
Default
(Range)
80%
(0 - 100%)
Default
(Range)
0.0 Hz
(0.0 - 590.0 Hz)
11
795