AUBER INSTRUMENTS
WWW.AUBERINS.COM
2020.06
P4/10
filt
20
FILT
PV input filter
SET
PV
SV
2S
SET
SET
SET
SET
SET
SET
SET
AL1
Alarm 1
pb
0
Pb
Input Offset
p
0
P
Proportional constant
i
500
I
Integral time
d
100
d
Derivative time
t
10
t
Cycle time
SET
SET
SET
SET
SET
SET
dp
1
dP
Decimal point position
outh
200
OutH
Output high limit
outl
0
OutL
Output low limit
addr
1
Addr
Communication address
baud
0
Baud
Communication baud
SET
SET
SET
SET
SET
SET
SET
SET
lock
0
Lock
Configuration Privilege
sn
k
Sn
Input Sensor Type
Op-a
1
Reserved
cf
c
CF
Display Temp Unit
alp
1
ALP
Alarm output definition
cool
0
Cool
System Function Selection
puh
1300
PuH
Display High Limit
pul
0
PuL
Display Low Limit
hy
0
.
5
Hy
Hysteresis Band
at
0
At
Auto Tuning
SET
SET
al1
200
al2
10
AL2
Alarm 2
Figure 4. Flow chart for system parameter menu
5.3.1.
Alarm function & parameters
This controller has two alarm output relays: AL1 relay (terminal 1 & 2) and AL2
relay (terminal 13 & 14). AL1 relay is temperature alarm. AL2 relay is program
ending alarm.
This controller has three alarm parameters: AL1, AL2, ALP.
Parameter AL1: Temperature alarm value for AL1 relay. See ALP definition
below.
Parameter AL2: Duration time for program ending alarm. Unit is per seconds.
Available range is 0s to 200s. AL2 is set as 10s, it means once the ramp soak
program is completed, AL2 relay will be triggered continuously for 10s. Then it
will be dropped off.
ALP: Alarm output definition for AL1 relay. The temperature difference to release
the triggered alarm is 0.5° F (parameter CF = 1) or 0.5° C (parameter CF = 0).
Table 3. ALP Definition
ALP
Value
Alarm Type
Alarm ON
Condition
Alarm OFF
Condition
0
AL1 is disabled
1
Absolute high
alarm
PV > AL1
PV < AL1
–
0.5
2
Absolute low
alarm
PV < AL1
PV > AL1 + 0.5
4
Derivation high
alarm
PV > SP + AL1
PV < SP + AL1
–
0.5
5
Derivation low
alarm
PV < SP
–
AL1
PV > SP
–
AL1 + 0.5
7
Band alarm,
direct acting (out
of range alarm)
PV < SP
–
AL1 or
PV > SP + AL1
PV > SP
–
AL1 + 0.5
and
PV < SP + AL1 -0.5
8
Band alarm,
reverse acting (in
range alarm)
PV > SP
–
AL1
and
PV < SP + AL1
PV < SP
–
AL1
–
0.5
or
PV > SP + AL1 + 0.5
Legend:
PV: current reading temperature
AL1: Value of parameter AL1
SP: Set temperature in current step (SV).
5.3.2.
Input offset “Pb”
Input offset Pb is used to add an offset value to compensate the sensor error or
simply to shift the reading. For example, if the controller displays 2ºC when probe
is in ice/water mixture, setting Pb = -2, will make the shift the temperature reading
to 0ºC.
5.3.3.
Control mode
1) PID control mode
Please note that because this controller uses fuzzy logic enhanced PID control
algorithm, the definition of the control constants (P, I and d) are different than
that of the traditional proportional, integral, and derivative parameters.
(1)
Proportional constant “P”
Please note that the P constant is not defined as Proportional Band as in the
traditional model. Its unit is not in degrees. A larger constant results in larger and
quicker action, which is the opposite of the traditional proportional band value. It
also functions in the entire control range rather than a limited band.
(2) Integral time “I”
Integral action is used to eliminate offset. Larger values lead to slower action.
Increase the integral time when temperature fluctuates regularly (system
oscillating). Decrease it if the controller is taking too long to eliminate the
temperature offset. When I = 0, the system becomes a PD controller.
(3) Derivative time “D”
Derivative action can be used to minimize the temperature overshoot by
responding to its rate of change. The larger the number, the faster the action.
2) On/off control mode
It is necessary for inductive loads such as motors, compressors, or solenoid
valves that do not like to take pulsed power. It works like a mechanical thermostat.
When the temperature passes hysteresis band (Hy, see section 5.3.6), the
heater (or cooler) will be turned off. When the temperature drops back to below
the hysteresis band, the heater will turn on again.
To use the on/off mode, set
P = 0
. Then, set Hy to the desired range based on
control precision requirements. Smaller Hy values result in tighter temperature
control, but also cause the on/off action to occur more frequently.
