2.5 d: References
238 YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING
Note:
When d4-01 = 1 [Freq Reference Hold Selection = Enabled] and b1-01 = 0 [Frequency Reference Selection 1 = Keypad], the drive will add
the bias value to the frequency reference when it does not receive an Up/Down 2 command for 5 s. Then the drive will reset the value to 0 at
which time you can increase the bias to the limit set in d4-08 again.
■ d4-09: Up/Down 2 Bias Lower Limit
No.
(Hex.)
Name Description
Default
(Range)
d4-09
(02B0)
RUN
Up/Down 2 Bias Lower
Limit
Sets the lower limit of the Up/Down 2 bias as a percentage of the Maximum Output Frequency.
0.0%
(-99.9 - 0.0%)
The drive saves the set bias lower limit in d4-06 [Frequency Ref Bias (Up/Down 2)]. Set d4-09 to an applicable value
before you use the Up/Down 2 function.
Note:
When d4-01 = 1 [Freq Reference Hold Selection = Enabled] and b1-01 = 0 [Frequency Reference Selection 1 = Keypad], the drive will add
the bias value to the frequency reference when it does not receive an Up/Down 2 command for 5 s. Then the drive will reset the value to 0.
If you increase the bias with the Up 2 command and d4-09 = 0, you cannot use a Down 2 command to decrease the frequency reference. To
decrease speed in this condition, set a negative lower limit in d4-09.
■ d4-10: Up/Down Freq Lower Limit Select
No.
(Hex.)
Name Description
Default
(Range)
d4-10
(02B6)
Up/Down Freq Lower Limit
Select
Sets the lower frequency limit for the Up/Down function.
0
(0, 1)
0 : Greater of d2-02 or Analog
The higher value between d2-02 [Frequency Reference Lower Limit] and an analog input programmed for Frequency
Reference [H3-02, H3-10 = 0] sets the lower frequency reference limit.
Note:
When you use External Reference 1/2 Selection [H1-xx = 2] to switch between the Up/Down function and an analog input as the reference
source, the analog value becomes the lower reference limit when the Up/Down command is active. Set d4-10 = 1 to isolate the Up/Down
function and the analog input value.
1 : d2-02
You can only use d2-02 to set the lower limit of the frequency reference.
◆ 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.
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