AUBER INSTRUMENTS
WWW.AUBERINS.COM
2021.01
P3/6
will take effect without the need for pressing the SET key. Figure 5 shows the
flow chart of the parameters.
Note: If the controller is locked (see 4.13), only limited parameters (or no
parameters) can be changed.
4.2 Parameter Name, Range and Initial Setting
4.2.1 Alarm parameters
This controller has two alarm outputs: Alarm 1 (AL1, NO relay) and Alarm 2
(AL2, NO relay). Two red alarm indicators are located on the front panel: AL1
and AL2. Alarm 1 and AL1 indicator are synchronized. Alarm 2 and AL2
indicator are synchronized. When the AL1 (AL2) indicator is ON, alarm 1 (alarm
2) relay pulls in. When the AL1 (AL2) indicator is OFF, alarm 1 (alarm 2) relay
drops off.
Each alarm is set by three parameters:
ALP, AL
and
Hy
. ALP1, AL1 and Hy1
are for Alarm 1. ALP2, AL2 and Hy2 are for Alarm 2. Alarm 1 can be set as
either temperature alarm (ALP1 = 1 ~ 4) or timer alarm/output (ALP1 = 0).
Alarm 2 can only be used for temperature alarm (ALP2 = 1 ~ 4). See ALP
definition below.
“
ALP
”
defines the type of alarm.
ALP = 0, timer alarm/output (alarm 1 only)
ALP = 1, high limit temperature alarm.
ALP = 2; low limit temperature alarm.
ALP = 3; deviation high temperature alarm.
ALP = 4, deviation low temperature alarm.
Note: When ALP1 is set to 0 (for timer output), parameter AL1 and Hy1 are not
in use. Only ALP1 can be set to 0. ALP2 = 0 is not functional for SWA-2451B.
“
AL
”
is for the alarm temperature setting. When alarm is set for high/low limit
alarm, its value is the temperature that alarm will turn on. When alarm is set for
high/low deviation alarm, its value indicates that the alarm will turn on when
temperature is deviated AL degree from the set temperature (SV). Note: when
alarm is set to deviation alarm (ALP1 / ALP2 is set to either 3 or 4), AL1 / AL2
can only be set to 100 as maximum.
“
Hy
”
is the hysteresis band of temperature alarm. This parameter also uses for
ON/OFF control mode (see 4.2.2 below). In heating mode, for high limit or
deviation high alarm mode, the alarm will turn off when the temperature is Hy
degree below alarm on setting; for low limit and deviation low alarm mode, the
alarm will turn off when temperature is Hy degree above the alarm on setting.
Example 1: ALP1 = 1 (high limit alarm), AL1 = 250, and Hy1 = 5. In this case,
alarm 1 will turn on when temperature goes above 250 degrees (AL1) and turn
off when temperature drop to 245 degrees (AL1-Hy1).
Example 2: SV = 200, ALP1 = 4 (deviation low alarm), AL1 = 10, and Hy1 = 5.
In this case, alarm 1 will turn on when temperature drop to 190(SV-AL1) and
turn off when temperature goes up to 195 (SV-AL1+Hy1).
4.2.2 Hysteresis Band “Hy”
The Hysteresis Band parameter Hy is also referred as Dead Band, or
Differential. It permits protection of the on/off control from high switching
frequency caused by process input fluctuation. Hysteresis Band parameter is
used for on/off control, as well as auto-tune process. For example: When
controller is set for on/off heating control mode, the output will turn off when
temperature goes above SV+ Hy and on again when it drops to below SV-Hy.
4.2.3 At (Auto-tuning)
The auto-tuning function (also called self-tuning) can automatically optimize the
PID parameters for the system. The auto-tuning function will use the on/off
mode to heat up the system until it passes the set point. Then let it cool down. It
will repeat this about three times. Based on the response time of the system,
the built-in artificial intelligence program will calculate and set the PID
parameters for the controller. If your system has a very slow response, the auto
tuning could take a long time.
AT start
AT calculation
AT end
ON
OFF
ON
OFF
ON/OFF
PID
Figure 4. Auto tuning
SV
PV
To activate auto-tuning, enter the parameter setting mode, set At = ON. The
“AT”
LED on the left lower corner of the controller will light up. Auto-tune will
finish when the AT LED turns off. The newly calculated PID parameters are set
and used for the system. Please note that auto-tuning is only for PID control
mode. There is no need for auto-tune when using ON/OFF mode (when P = 0).
To stop the auto-tuning, enter the parameter setting mode, set At = OFF. Then,
the previous PID parameters values are resumed.
Hy2
1
.
0
Figure 5. System setup flow chart.
SET 3S
SET
SET
SET
SET
SET
SET
SET
SET
SET
SET
SET
SET
SET
AL1
999
.
9
ALP 1
Alarm 1 Definition
ALP 2
Alarm 2 Definition
Cool
Cooling Control
OUTH
Output High Limit
Lock
Configuration Privilege
Sn
Input Type
OPA
Output Mode
CF
Display Unit
DIH
Input High Limit
DIL
Input Low Limit
SC
0
.
0
P
15
.
0
I
240
D
30
AT
OFF
t
10
Hy1
1
.
0
DP
1
ALP2
0
COOL
OFF
Hy
1
.
0
AL2
0
SET
SET
SET
outh
100
LOCK
0
ALP1
0
85
.
5
10
AL1
Alarm1 Setting
AL2
Alarm2 Setting
SC
Input Offset
P
Proportional Constant
I
Integral Time
D
Derivative Time
At
Auto Tune
T
Cycle Time
Hy
Hysteresis Band
Hy 1
Alarm 1 Hysteresis Band
Hy 2
Alarm 2 Hysteresis Band
dP
Decimal Point Position
Sn
k
OPA
0
Dil
0
dih
999
.
9
cf
c
Time
SET
SET
SET
SET
SET
PV
