Sako SKI600, Manual

Page: 121 / 180

115
F8.01
PID input channel
0 ～ 6
0
F8.02
Digital reference input
0.0 ～ 100.0％
50.0%
This function realized input setting of closed
loop control via keypad when analog feedback
is used. It is only effective when digital setting
of closed loop setting channel is selected
(F8.01=0).
For example: in closed loop control system of
constant pressure water supply, this function
code setting should take into full account of
measuring range of transmissible pressure
gauge and its feedback signal output. If
the measuring range is 0 ～ 10Mpa, the
corresponding voltage output is 0 ～ I0V, then
we need pressure of 6MPa, and set the digital
value as 6.00V, so the needed pressure is 6MPa
when PID regulation is steady.
F8 Process PID Parameter
An integrated analog feedback control
system can be formed through this group of
parameters setting.
Analog feedback control system: specified
value is input via AI1, the physical quantity of
controlled object is converted to current of
4 ～ 20mA and input via AI2, then pass through
built-in PI regulator, which form closed loop
control system, as showed in the following
figure:
Fig. F8-1 Analog Feedback Control System
F8.00
PID operation input mode
0 ～ 1
0
0: auto
1: manually input via defined multi-function
terminal
0: digital setting
PID input is given by digital setting, and
determined by F8.02.
1: AI1
PID input is given by external analog signal
AI1 (0 ～ 10V/0-20mA).
2: AI2
PID input is given by external analog signal
AI2 (0 ～ 10V).
3: pulse setting
PID input is given by external impulse signal.
4: RS485 communication
PID input is given by communication.
5: reserved
6: panel potentiometer
F8.03
PID feedback channnel
0 ～ 7
0
1PXFS
4PVSDF
#SFBLFS
5SBOTNJTTJPO
1BSU
4FOTPS
. 1
_N"
3
4
5
'8%
$0.
7
"*
6
7
8
1&
"*
7
(/%
'8%4UPQ
$PNNBOE
_,
Fig. F8-2 PID Regulation
PID regulation is as follows:
3FGFSFODF
'FFECBDL
3FHVMBUJPO
+
%
'FFECBDL
%SJWF
$POUSPMMFE
0CKFDU
1
4.2 Detailed Function Description