12.4 d: REFERENCE
626 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
The speed limit is the value set in d5-04.
■ d5-04 Speed Limit
No.
(Hex.)
Name Description
Default
(Range)
d5-04
(029D)
Speed Limit
Sets the speed limit during Torque Control as a percentage of E1-04 [Max Output Frequency]. Set
d5-03 = 2 [Speed Limit Selection = d5-04 Setting] before you set this parameter.
0%
(-120 - +120%)
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.
(Hex.)
Name Description
Default
(Range)
d5-05
(029E)
Speed Limit Bias
Sets a bias to the speed limit as a percentage of E1-04 [Max Output Frequency].
10%
(0 - 120%)
Adjusts the margin for the speed limit.
■ d5-06 Spd/Trq Chg Time
No.
(Hex.)
Name Description
Default
(Range)
d5-06
(029F)
Spd/Trq Chg Time
Sets the delay time to switch between Speed Control and Torque Control. Set H1-xx = 13 [H1-xx:
MFDI Function Select = Spd/Trq Switch] before you set this parameter.
0 ms
(0 - 1000 ms)
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 UniDir Speed Bias
No.
(Hex.)
Name Description
Default
(Range)
d5-08
(02B5)
UniDir Speed Bias
Sets the direction of the speed limit reference to which Speed Limit Bias [d5-05] applies.
1
(0, 1)
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 H1-xx = 44 [Field weakening] 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.
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.
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