5.2 b: Application
5
YASKAWA ELECTRIC
SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
155
■
b5-28: PI Feedback Function Selection
If b5-28 = 1, the square root of the PI feedback is compared to the PI Setpoint in order to determine appropriate drive
output to properly regulate the system. This is helpful in cases where the measured feedback is pressure but the PI loop
needs to regulate flow.
0: Disabled
1: Square Root
■
b5-29: PI Square Root Gain
A multiplier applied to the square root of the feedback.
If the PI Function is regulating the flow of a closed loop system by using a pressure feedback, it may be convenient to
view the square root of the PI output using monitor U1-37.
■
b5-30: PI Feedback Offset
Sets PI feedback Offset as a percentage of maximum frequency.
■
b5-34: PI Output Lower Limit
Sets the minimum possible PI controller output as a percentage of the maximum output frequency (E1-04). The lower
limit is disabled when set to 0.00%.
■
b5-35: PI Input Limit
Sets the maximum allowed PI input as a percentage of the maximum output frequency (E1-04). Parameter b5-35 acts as
a bipolar limit.
■
b5-38, b5-39: PI Setpoint User Display, PI Setpoint Display Digits
When parameter b5-20 is set to 3, the parameters b5-38 and b5-39 can be used to set a user defined display for the PI
setpoint (b5-19) and PI feedback monitors (U5-01, U5-04).
Parameter b5-38 determines the display value when the maximum frequency is output. Parameter b5-39 determines the
number of digits. The setting value is equal to the number of decimal places.
■
b5-40: Frequency Reference Monitor Content During PI
Sets the content of the frequency reference monitor display (U1-01) when PI control is active.
Setting 0: Frequency Reference after PI
Monitor U1-01 displays the frequency reference increased or reduced for the PI output.
No.
Name
Setting Range
Default
b5-28
PI Feedback Function Selection
0,1
0
No.
Name
Setting Range
Default
b5-29
PI Square Root Gain
0.00 to 2.00
0.00
No.
Name
Setting Range
Default
b5-30
PI Feedback Offset
0.00 to 100.00%
0.00%
No.
Name
Setting Range
Default
b5-34
PI Output Lower Limit
-100.0 to 100.0%
0.0%
No.
Name
Setting Range
Default
b5-35
PI Input Limit
0.0 to 1000.0%
1000.0%
No.
Name
Setting Range
Default
b5-38
PI Setpoint User Display
1 to 60000
Determined by b5-20
b5-39
PI Setpoint Display Digits
0 to 3
Determined by b5-20
No.
Name
Setting Range
Default
b5-40
Frequency Reference Monitor Content During PI
0 or 1
0
SIEP_C710616_35.book 155 ページ 2015年11月30日 月曜日 午後2時2分