6-86
PI Control Methods
There are four PI control methods. Select the method by setting constant b5-01.
PI Input Methods
PI Target Value Input Methods
Select the PI control target value input method according to the setting in b1-01 (Reference Selection).
Normally, the frequency reference selected in b1-01 is the PI target value, but you can also set the PI target
value as shown in the following table.
PI Feedback Input Methods
Select one of the following PI control feedback input methods
If H3-09 is set to 16, the PI differential mode is activated. Both analog inputs (A1 and A2) become feedback
inputs and the difference between both becomes the feedback value for the PI controller. The monitor U1-24
becomes the feedback 1 monitor, U1-53 becomes the feedback 2 monitor.
In this mode the PI target value automatically is taken from the source set in b1-01 or a multistep speed refer-
ence (d1-01 to d1-04).
Set Value Control Method
1 PI output becomes the Inverter output frequency.
3 PI output is added to the frequency reference as compensation value of the Inverter output frequency.
PI Target Input Method Setting Conditions
MEMOBUS register 0006H
Set MEMOBUS bit 1 in register address 000FH to 1 (enable/disable PI target value from
communications) to be able to use register number 0006H as the PI target value.
Constant setting If b5-18 is set to 1 the value in b5-19 becomes the PI target value.
If the PI function is used, the frequency reference value becomes the target value, which is set and shown
in Hz on the operator. Nevertheless, internally the PI target value is used in percent. I.e. the following
formula is used:
Input Method Setting Conditions
Analog input A2 Set H3-09 (Multi-function Analog Input Terminal A2 Selection) to B (PI feedback).
Analog input A1 (Differential
Mode)
Set H3-09 to 16. Analog input A1 becomes the feedback 1 input and the analog input A2
becomes the feedback 2 input.
NOTE
PI target value [%] =
frequency reference [Hz]
max. output frequency [Hz]
• 100 %
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
Need help?
General