AUBER INSTRUMENTS
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2019.01
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contact and other may need N.C. contact switch. Please see Fig. 7 and 9 for
examples.
3.3 Control output connection
The SSR control output of the controller SWA-2451A provides a pulsed 12V DC
signal for the SSR. Connect terminal 10 to the positive input and terminal 9 to
the negative input of the SSR. See Figure 7 for details.
3.4 For first time users without prior experience with PID controllers, the
following notes may prevent you from making common mistakes.
3.4.1
SSR output power does not come from the input of the SSR. The output
of the SSR is a single pole switch between terminals 1 and 2 of the SSR. The
input of the SSR is for controlling, or triggering the SSR. (Please note we are
talking about the SSR itself, not the SSR control output of the controller).
When switching a North American 240V AC power (2 hot wires), the heater will
be live even when the SSR is off. Users should install a double pole mechanical
switch to the power input, to cut both hot wires at same time when not in use.
3.4.2.
For all controller models listed in this manual, the power is controlled by
regulating the duration of on time for a fixed period of time. It is not controlled by
regulating amplitude of the voltage or current. This is often referred as
time
proportional control
. For example, if the cycle rate is set for 100 seconds, a
60% output means controller will switch on the power for 60 seconds and off for
40 seconds (60/100 = 60%). Almost all high power control systems use time
proportional control because amplitude proportional control is too expensive
and inefficient.
4. Front Panel and Operation
Figure 2. Front panel.
1.
PV display: Indicates the sensor read out, or process value (PV).
2.
SV display: Indicates the time when timer is used. If timer is deactivated, it
indicates the set temperature (SV). In manual control mode, an
“
H
”
is
displayed on the most left digit to indicate number is for percentage of
output (%).
3.
Output indicator: It is synchronized with SSR output on the controller
(terminal 9 and 10). When it is on, SSR output is triggered, and your
external SSR & heater (or cooler) are powered.
4.
AL1 indicator: It is synchronized with alarm 1 relay (AL1). When timer is on,
it works as the timer relay output indicator. When timer is deactivated, it
lights when Alarm 1 condition meets.
5.
AL2 indicator: It is synchronized with alarm 2 relay (AL2). It lights when
Alarm 2 condition meets.
6.
Auto-tune indicator: It lights up when auto-tune starts.
7.
SET key: Press and hold this key for 3 seconds will enter the temperature
control parameter setting mode. When the controller is in temperature, or
timer parameter setting mode, press this key momentarily will lead the
display to the next parameter.
8.
Automatic/Manual function key/Data shift key
◄
: press
◄
for 3 seconds to
enter manual tuning mode. Press
◄
for 3 seconds again to exit.
9.
Decrement key
▼
: Decreases numeric value of the setting value. Press for
3 seconds to enter the timer setting mode.
10.
Increment key
▲
: Increases numeric value of the setting value. Press for 3
seconds to enter the temperature setting mode.
4.1 Display Modes
8888
20
PV
SV
◄
for 3s
Power on
Figure 3. Display modes
▲
For
3s
▼
For
3s
PV
SV
SV
PV
SP
100
tE1
20
◄
for 3s
PV
SV
8888
H 0
PV
SV
AL1
999.9
SET for 3s
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Display mode 1: Normal operation display.
PV is the abbreviation for Process Value. SV is the abbreviation for Set Value.
When the power is turned on, the upper display window shows the measured
temperature value. If the timer is used, the lower window shows set timer value.
When timer starts, it shows the time as it counts up or down. If the timer is
disabled (INT = 0), the lower display shows the set temperature.
Display mode 2: Changing temperature set value (SV)
Press the
▲
key for 3 seconds, and then release it. The decimal point on the
lower right corner will start to flash. Press the
▼
or
▲
key to change SV until
the desired value is displayed. If the change of SV is large, press the
◄
key to
move the flashing decimal point to the desired digit that needs to be changed.
Then press the
▼
or
▲
key to start changing SV from that digit. The decimal
point will stop flashing after no key is pressed for 3 seconds. The changed SV
will be automatically registered without pressing the SET key.
Display mode 3: Timer parameter set up.
Press the
▼
key for 3 seconds to change the display status into timer
parameter setting mode. The upper display window shows the timer parameter
symbol to be changed, the lower display shows its value. Press the
◄
,
▼
or
▲
to change the setting. Then, press SET to go to next parameter. If no key is
pressed for 10 seconds, the display will return to mode 1 automatically. The
change of value will take effect without the need for pressing the SET key. See
4.14 to 4.16 for more details.
Display mode 4: Manual mode.
Press the
◄
key for 3 seconds to enter the manual mode. In this mode, the
lower display has an H on the most left. The number on the right is the
percentage of power output. Press the
▼
or
▲
to adjust the power. Press the
◄
key for 3 seconds again to exit this mode. For more details, please see 4.3.
Display mode 5: Temperature control parameter setting.
Press the SET key for 3 seconds to enter the temperature control parameter
setting mode. The upper display window shows the parameter symbol to be
changed, the lower display shows its value. Press
◄
,
▼
or
▲
to change the
setting. Then, press SET to go to next parameter. If no key is pressed for 10
seconds, the display will return to mode 1 automatically. The change of value
