Page
13
450 M1 02 B
11-10-2007
Regulation
Gain
Ti(s)
Td(s)
PID
1,2 x T/t
2 x t
0,5 x t
PI
0,9 x T/t
3,3 x t
0
P
T/t
9999
0
ADJUST PID PARAMETERS
In order to determinate the setup values for PID regulation, we recommend to use the Ziegler-Nichols open loop method
Proceed as following:
- Connect a recorder to the analogic measurement output or write the reading measurement values for then to draw the graph f
(time)
- Switch on the PID regulation in MANUAL mode
- Reach to and keep close the measurement value to the set point, adjusting the PID output
- Apply on ΔCde a step of 10 % (for instance) on the analogic output (Cde).
Example:
if the value is 30,00 %, apply 40,00 %
- Note on the graph the corresponding timing.
- Determinate on this graph both t ant T:
t = delay of response
T = Time corresponding to the same variation in % of measurement (Δm) and the analogic output (ΔCde), Δm = ΔCde.
This value may be found out on the slope.
- Modify the PID parameters as following:
REGUL PID
Output mA Oxygen
Please see page 14
This operating mode allows a PID regulation with
an analogic output 0/20 or 4/20 mA
REGUL
ON/OFF
To switch ON or OFF the regulation mode
REGUL
AUTO/MANU
MANU=MANUAL to be able to check the relays output
SET VAL
00,00 mg/l
Set point value
GAIN :
0,000
Gain setup (see also ADJUST PID PARAMETERS)
T.i :
0050
Sec
Integrant setup
Td :
0012
Sec
Derivative setup
ACTION:
DIRECT/REVERSE
OUTPUT
4/20 mA
/
0/20 mA
SAVING ?
L
L
L
L
L
L
L
L
L
L
L
L
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
VALID
MENU
+
To switch the PID regulation on stand-by, please input 24 V= 20 mA on terminals 5(+) and 6(-).
