D6: Field Weakening /Forcing - YASKAWA GA800 Technical Reference

12.5 d: References
■
d5-04: Speed Limit
No.
Name
(Hex.)
d5-04 Speed Limit
(029D)
The speed limit is a positive value when it is in the same direction as the Run command. The speed limit is a negative
value when it is in the opposite direction of the Run command.
■
d5-05: Speed Limit Bias
No.
Name
(Hex.)
d5-05 Speed Limit Bias
(029E)
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.
814
V/f CL-V/f OLV CLV AOLV
Sets the speed limit during Torque Control as a percentage of E1-04 [Maximum Output Frequency].
Set d5-03 = 2 [Speed Limit Selection = d5-04 Setting] before you set this parameter.
V/f CL-V/f OLV CLV AOLV
Sets the speed limit bias value as a percentage of E1-04 [Maximum Output Frequency].
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 Selection = 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.
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
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Default
(Range)
0%
(-120 - +120%)
Default
(Range)
10%
(0 - 120%)
Default
(Range)
0 ms
(0 - 1000 ms)
Default
(Range)
1
(0, 1)