Auber Instruments SWA-2451B Gebrauchsanweisung - Seite 3
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AUBER INSTRUMENTS
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.
2021.01
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.
PV
85.5
10
Time
SET 3S
AL1
AL1
999.9
Alarm1 Setting
SET
AL2
AL2
0
Alarm2 Setting
SET
SC
SC
0.0
Input Offset
SET
P
P
15.0
Proportional Constant
SET
I
I
240
Integral Time
SET
D
D
30
Derivative Time
SET
AT
At
OFF
Auto Tune
SET
t
T
10
Cycle Time
SET
Hy
Hy
1.0
Hysteresi s Band
SET
Hy1
Hy 1
1.0
Alarm 1 Hysteresi s Band
SET
Hy2
Hy 2
1.0
Alarm 2 Hysteresi s Band
SET
DP
dP
1
Deci m al Point Position
SET
Figure 5. System setup flow chart.
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cf
CF
c
Display Unit
SET
dih
DIH
999.9
Input High Limit
SET
Dil
DIL
0
Input Low Limit
SET
OPA
OPA
0
Output Mode
SET
Sn
Sn
k
Input Type
SET
Lock
LOCK
0
Configuration Privi l ege
SET
outh
OUTH
100
Output High Limit
SET
COOL
Cool
OFF
Cooling Control
SET
ALP2
ALP 2
0
Alarm 2 Definition
SET
ALP1
ALP 1
0
Alarm 1 Definition
P3/6