Control Actions - gefran 1000 Manual De Uso

Notes:
- The output state can be reversed by setting its alarm to reverse (code AL for outputs
AL1 and AL2 and code Out for output AL3, in CFG.2 phase).
- The selection for outputs AL2 and AL3 is inoperative in case of configuration type
"relay not present" (see brd code)
Function "ArF" has priority over function "Out".
Ctr/ Selection of type of PID control and means of switching from automatic to manual
according to table:
Ctr PID Control for:
0 Slow process (ts=8sec)
1 Fast process (ts=1sec)
2 Slow process (ts=8sec)
3 Fast process (ts=1sec)
Notes:
ts - sample time for actions I and D
A fast process is defined as one with main time constant less than 60 seconds. It is
advisable to disable the digital filter on the input in case of PID for fast processes (see
S.tu code in phase 0).
Hb.F/ Selection of type of HB alarm from 4 different choices:
0 - alarm trips when load current (CT input) drops below limit set for ON time of main
output
1 - alarm trips when ammeter full scale (Hb.S) in main output OFF time is exceeded
by 12%
2 - alarm trips if one of functions 0 and 1 (described above) is active. (OR logic
between functions 0 and 1)
3 - HB alarm for continuous output (PWM, setting _Ct = -1 or -2); does not take
account of ON/OFF times and presupposes a special ammeter card with hw integration
of load current.
Notes:
- code Hb.F is accessible only with ammeter input card installed (see brd code) and
HB alarm enabled (code Out in CFG.2)
- see also ALARM FUNCTIONS / HB ALARM
Enable configuration and calibration as described in the manual in the Hardware
Configuration section (jumpers "3" and "6" closed).
In phase CFG/2 (Configuration 2), set the type of input probe:
parameter tyP:
tyP = 0,1,2,3,4,5 for thermocouples J,K.N.S R,T
tyP = 6,7 for resistance thermometers Pt100
typ = 8,9,10 for linear input 0 ..50mV
typ = 12,13,14 for linear input 10 ..50mV
tyP = 11 for resistance thermometers Pt100 special scale -19.9. .99.9
(199.9)°C with hardware modification.
Quit phase CFG/2: the instrument returns to normal operation. Proceed to calibration
with the instrument ON for at least 5-10 minutes. Calibrate as follows:
A) Calibration of thermocouples J,K,N,S,R,T and linear input 0-50mV10-50mV.
A.1) Keep the F key pressed until CAL appears on the display; release F.
A.2) Connect a 50.00mV signal from a calibrator between terminals 1 (+) and 3 (-).
A.3) Press F: the display shows message CAL/50; wait about 6 seconds.
A.4) Press F: the display shows message t.A/25.0; with the raise and lower keys, set
the real value of the room temperature in which you are performing the calibration pro-
cedure (example: t.A = 23.7°C). You do not have to set the room temperature for linear
inputs.
A.5) Press F: the display shows brd/value; set the hardware model code (see brd
table in CFG.2 phase).
A.6) Press F to end the calibration procedure; the instrument will return to normal oper-
ation. If the 50mV signal remains in input, the display shows message _Hi per tyP=
0,1,2,3,4,5 (thermocouples) or maximum scale for tyP = 8,9,10,12,13,14 (linear scale).
The thermocouple and linear input is now calibrated.
B) Calibration of Pt100 2/3 wires resistance thermometer input (tyP =6 or 7).
B.1) Keep the F key pressed until CAL appears on the display; release F.
B.2) Press F; the display shows message CAL/18; between terminals 1 and 3, connect
a resistance of 18.49 Ohms or a calibrator signal of -200.0°C; short circuit terminals 3
and 4; wait about 10 seconds.
Proportional Action: action in which the contribution on the output is proportional to the
deviation in input (deviation is the difference between the controlled variable and the
value you want).
Derivative Action: action in which the contribution on the output is proportional to the
speed of variation of the deviation in input.
Integral Action: action in which the contribution on the output is proportional to the inte-
gral in time of the deviation in input.
Influence of Proportional, Derivative and Integral actions on response of process
under control.
• Increasing the proportional band reduces oscillations but increases deviation.
• Reducing the proportional band reduces deviation but causes oscillations of the con-
7 • PROGRAMMING
.
Switching from Auto/Manual
with power man. saved
with power man. saved
with power autom. current
with power autom. current
8 • CALIBRATION
9 • CONTROL ACTIONS
brd/ Hardware model code and enabling of automatic / manual (A/M) function
brd Display A/M
0 3 digits disabled
2 4 digits disabled
4 3 digits enabled
6 4 digits enabled
8 3 digits disabled
10 4 digits disabled
12 3 digits enabled
14 4 digitss enabled
16 3 digits disabled
18 4 digits disabled
20 3 digits enabled
22 4 digits enabled
24 3 digits disabled
26 4 digits disabled
28 3 digits enabled
30 4 digits enabled
Add 64 to code to configure the model with input from current transformer.
Add 128 to code to configure the model with serial communication CL or 485.
Notes:
- The selected configurations must conform to the instrument's hardware model. An
incorrect selection may cause functioning not conforming to specifications.
- The brd code can be changed only with jumper 6 closed (Hardware Configuration /
Inputs Card).
- The brd code is also available in calibration phase.
B.3) Press F: the display shows message CAL/250; between terminals 1 and 3, con-
nect a resistance of 250.00 Ohms or a calibrator signal of +408.6°C; keep the short
between terminals 3 and 4; wait about 10 seconds.
B.4) Press F: the display shows brd/value; set the hardware model code (see brd
table in CFG.2 phase).
B.5) Press F to end the calibration procedure; the instrument will return to normal oper-
ation. If the 250 Ohm resistance remains in input, the display shows message _Hi. The
Pt100 input is now calibrated.
C) Calibration of Pt100 2/3 wires special scale resistance thermometer input (tyP = 11)
Before starting the calibration procedure, make sure the instrument hardware accepts
this type of input.
C.1) Keep the F key pressed until CAL appears on the display; release F.
C.2) Press F; the display shows message CAL/92; between terminals 1 and 3, connect
a resistance of 92.16 Ohms or a calibrator signal of -20.0°C; short circuit terminals 3
and 4; wait about 10 seconds.
C.3) Press F; the display shows message CAL/175; between terminals 1 and 3, con-
nect a resistance of 175.84 Ohms or a calibrator signal of +200.0°C; keep the short
between terminals 3 and 4; wait about 10 seconds.
C.4) Press F: the display shows brd/value; set the hardware model code (see brd
table in CFG.2 phase).
C.5) Press F to end the calibration procedure; the instrument will return to normal oper-
ation. If the 175.84 Ohm resistance remains in input, the display shows message _Hi
for model 1000 and the value 199.9 for models 1001, 1101.
The Pt100 input is now calibrated.
D) Calibration of CT (ammeter) input for HB alarm.
The procedure is enabled only if the hardware accepts this type of input (see brd code
in CFG.2).
D.1) Keep the F key pressed until Hb.C appears on the upper display. Between fastons
6 and 7, connect a 5A AC signal.
D.2) Press the F key: the display shows message Hb.C/5; wait about 6 seconds.
D.3) Press the F key to end the CT input calibration procedure; the instrument will
return to normal operation. If the 5A current remains in the CT input, the current value
(accessible with key F) will show the set full scale (parameter Hb.S in phase CFG/1).
The CT input is now calibrated.
trolled variable (excessively low proportional band values make the system unstable).
• Increasing derivative action corresponds to an increase of derivative time, reduces
deviation and avoids oscillations up to a critical value of derivative time, beyond which
deviation increases and extended oscillations occur.
• Increasing integral action corresponds to a reduction of integral time, tending to can-
cel deviation under normal working conditions between the controlled variable and the
value you want (setpoint).
If the integral time value is too long (weak Integral Action), there may be persistence of
the deviation between the controlled variable and the value you want.
In this case, you should reduce the proportional band and increase the Derivative and
Integral Actions until you get the result you want.
15
Relay AL2 Relay AL3
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