AUBER INSTRUMENTS
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2021.10
P3/6
Table 2. Temperature sensor code
Symbol
Description
Working Temperature Range
t
t
TC, Type T
-200~400° C; -320~752° F
r
r
TC, Type R
-50~1600° C; -58~2900° F
j
J
TC, Type J
-200~1200° C; -320~2200° F
WRE
WRE
TC, WRe3/25
0~2300° C; 32~4200° F
b
b
TC, Type B
350~1800° C; 660~3300° F
s
s
TC, Type S
-50~1600° C; -58~2900° F
k
k
TC, Type K
-200~1300° C; -320~2400° F
e
e
TC, Type E
-200~900° C; -320~1650° F
P10
.
0
P10.0
RTD, Pt100
-99.9~600.0° C; -99.9~999.9° F
P100
P100
RTD, Pt100
-200~600° C; -320~1100° F
Cu50
Cu50
RTD, Cu50
-50.0~150.0° C; -60~300° F
Note 2.
The value of
outy
determines the control mode. When it is set to:
0 - Relay J1, J2 as alarm output; SSR output disabled;
1 - Relay J1 as alarm output; J2 as PID controlled relay contact output; SSR
output disabled;
2 - Relay J1, J2 as alarm output; SSR PID control output;
3 - Relay J1, J2 as alarm output; SSR On/off control output;
4 - Relay J1 as alarm output; J2 as On/off control relay contactor output;
SSR output disabled;
5 - Relay J1 as alarm output; J2 as Limit control relay contactor output;
SSR output disabled;
6 - Relay J1, J2 as alarm output; SSR for Limit control output.
Note 3.
Hysteresis Band (also called dead band, or differential), Hy, is used for
On/off control and Limit control. Its unit is in degrees (
°
C or
°
F). For On/off control
mode, the output will be off when PV > SV and on again when PV < SV-Hy for
heating. For cooling, the output will be off when PV < SV and on again when PV >
SV + Hy. For Limit control mode, the controller cannot be reset (to turn on the
output) when PV > SV - Hy for heating, and when PV < SV + Hy for cooling.
Note 4.
The Autotune offset will shift the SV value down by the Atdu value during
the Autotune process. That will prevent the system from damage due to
overheating during the Autotune.
Note 5
. Calibration offset, PSb is used to set an input offset to compensate the
error produced by the sensor. For example, if the meter displays 5 ºC when probe
is in ice/water mixture, setting PSb = -5, will make the controller display 0 ºC. To
set negative value, shift to the very left digit, press down key until it shows
“
-
”.
5.2 PID Parameters (accessed by code 0036)
The PID and relevant parameters are listed in table 3. To change the parameters,
press SET key, en
ter code “0036”, and press SET
key again. The parameter flow
chart is similar to Figure 3.
The values of the P, I, and D parameters are critical for good response time,
accuracy and stability of the system. Using the Auto-tune function to automatically
determine these parameters is recommended for the first time user. If the auto-
tuning result is not satisfactory, you can manually fine-tune the PID constants for
improved performance.
Table 3. PID and relevant parameters
Symbol
Description
Setting
Range
Initial Note
P
P
Proportional
Constant
0.1~99.9(%)
5.0
6
I
I
Integral Time
2~1999(Sec)
100
7
d
d
Derivative Time
0~399(Sec)
20
8
SouF
SouF
Damp Constant
0.1~1.0
0.2
9
ot
ot
Cycle Rate
2~199(Sec)
2
10
FILt
FILt
Digital Filter Strength
0~3
0
11
End
End
Exit
Note 6.
Proportional Constant (P): P is also called the proportional band. Its unit
is the percentage of the temperature range. e.g. For a K type thermocouple, the
control range is 1500° C. P=5 means the proportional band is 75° C (1500x5%).
Assuming the set temperature (SV) = 200. When integral, I, and derivative, d,
actions are removed - the controller output power will change from 100% to 0%
when temperature increases from 125 to 200° C. The smaller the P value is, the
stronger action will be for the same temperature difference between SV and PV.
Note 7
. Integral time (I): Brings the system up to the set value by adding to the
output that is proportional to how far the process value (PV) is from the set value
(SV) and how long it has been there. When I decreases, the response speed is
faster but the system is less stable. When I increases, the respond speed is slower,
but the system is more stable.
Note 8
. Derivative time (d): Responds to the rate of PV change, so that the
controller can compensate in advance before |SV-PV| gets too big. A larger
number increases its action. Setting d-value too small or too large would decrease
system stability, cause oscillation or even non-convergence.
Note 9.
Damp constant: This constant can help the PID controller further improve
the control quality. It uses the artificial intelligence to dampen the temperature
overshot. When its value is too low, the system may overshoot. When its value is
too high, the system will be over damped.
SouF too low
SouF acceptable
SouF too high
Figure 4. Damp constant
Note 10
. Cycle rate (ot): It is the time period (in seconds) that controller uses to
calculate its output. e.g. If ot=2, and controller output is set to 10%, the heater will
be on 0.2 second and off 1.8 seconds for every 2 seconds. Smaller ot result in
more precision control. For SSR output, ot is normally set at 2. For relay or
contactor output, it should be set longer to prevent contacts from wearing out too
soon. It normally set to 20~40 seconds.
Note 11
. Digital Filter (Filt): Filt=0, filter disabled; Filt=1, weak filtering effect; Filt=3,
strongest filtering effect. Stronger filtering increases the stability of the readout
display, but causes more delay in the response to changes in temperature.
5.3 Temperature setting and Alarm setting (accessed by code 0001)
The temperature and alarm parameters are listed in table 4. To change the
parameters, press SET key
, enter code “0001” an
d press SET key again. The
parameter flow chart is similar to Figure 3.
