PI CONTROL
19
C
- PI CONTROL -
PI CONTROL : OFF
ACTION : REVERSE
START : MANUAL
P-GAIN : 01.0
I-TIME : 000 SECS
START PB : F2
START DIGIN : NONE
MAN/AUTO PB : F3
MAN/AUTO DIGIN : NONE
STOP PB : NONE
STOP DI : D1
Or On
Direct
Auto ( Start MAN, 2”, go to Auto ),Power on
Proportional Gain ( 00.5 - 50.0 )
Integrating Time 001-999 secs,000 = Off
F1-4 ( Function Keys ), None
D1-6 ( Digital Inputs ), None
F1-4 ( Function Keys ), None
D1-6 ( Digital Inputs ), None
TRANSMITTER SETTINGS
20
C
- TRANSMITTER SETTINGS -
Service Menu
Function Block Number 19 (LCT or (18) Beltweigher or (17) Loss-in-Weight)
19.
- PI CONTROL -
PI CONTROL OR DISPLAYS
SETPOINT VALUES
DISPLAYS
TRANSMITTER SETTINGS
SERVICE
SERVICE
Key
Key
Display
Display
Display
Display
Display
Display
If On
Ziegler-Nichols Closed Loop Tuning
When optimising start the loop in automatic with a gain low enough to prevent oscillation. Increase the gain in steps one half the previous gain, If
no oscillation occurs change the Setpoint slightly in order to trigger an oscillation. Adjust the gain until the oscillation is sustained. If the
oscillation is increasing decrease the gain slightly. If it is decreasing, increase the gain slightly. Note the gain which causes the sustained
oscillation and measure the period of oscillation (high peak to high peak). Set the P-Gain to 45% of this value. To optimise the integral time take
the period of oscillation and set the I-Time to 1,2 x oscillation period in seconds.
PI Control Formula used in the 6004MF
REVERSE ACTING : Ao = Mo + Pg.E + Pg.E.Ts/Ti + Ic
DIRECT ACTING : Ao = Mo - Pg.E - Pg.E.Ts/Ti - Ic
Where
Ao = Analog output % (Volt or mA as selected in Analog out)
E = Deviation error + % = ( SP % - PV % )
Pg = Proportional Gain ( P-Gain: 0,01 - 50)
Ts = Sample period seconds (fixed to 1 second)
Ti = Integration Time seconds ( I-Time: 001 to 999)
Mo = Manual analog output % (00-99,9%)
Ic = Start at 0, each 1 sec cycle add previous Pg.E.Ts/Ti value
PV = Process Variable % (PV value in % , 00-99,9%)
SP = Auto Setpoint % ( Auto SP in % , 00-99,9%)
F1-4 ( Function Keys ), None
D1-6 ( Digital Inputs ), None
Page
51
Содержание 6004BW
Страница 1: ...6004BW Belt Weigher Transmitter ...