Pid Control; Example Of Pid Control Configuration - GE VAT2000 Instruction Manual

B43-0~4

PID control

The analog input (FSV, FSI, AUX) can be configured as a feedback loop as shown below.
The below is an example. It is possible to use any analog input either as setting or feedback.
0-10V
4-20m A
(Note 1)
(Note 2)
The PID operation block is shown below,
FS V o r FS I
(1) Is possible to enable or disable the PID control during operation by switching ON or
OFF the sequence input function PIDEN. This can be controlled by one of the
programmable digital inputs.
(2) Refer to fig 5-9 and select the PID's setting input.
(3) Set the analog input to be used as feedback with C07-5. Set the range of the selected
analog input with block parameters C12.
(4) If the feedback signals must be 4-20mA type, use FSI as feedback. However would be
possible to use AUX for 4-20mA signals, setting C12-2=2 to fix AUX input in range of 1-
5V, and then connect a external resistor of 250 Ohms, 1%, 1/2W, between AUX and
COM terminals.
6. Control Functions and Parameter Settings
VAT2000
FS V o r FS I
PID
+
-
C 12-4(ga in)
C O M
AU X

Example of PID control configuration

PID control functions only in the remote mode (LCL LED OFF)
PID control functions in respect to the sequence command FRUN or RRUN, but
does not operate with other sequence commands like Jog for example
A U X or FS I
L im it
0 to 10 0%
D ifere ntia l tim e co nsta nt (B 4 3-2 )
In te gra l tim e co nsta nt (B 4 3-1)
P ro po rtion al g ain (B 43 -0)
6-48
pressure sen so r
M Pum p
0-10V
C onverter
M ax freq ue ncy (B 0 0-4 )
M ax. sp ee d (B 01 -4 )
Fre q ue ncy
o r spe ed con tro l
U p pe r lim ite r (B 43 -3)
L ow e r lim ite r (B 43 -3)