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AUBER INSTRUMENTS
5. Application Examples
A. 240V heater with alarm buzzer (Oven/Smoker/Cooker)
120V Buzzer
1
13
14
2
SWA-
3
2451B
+
4
-
11
12
5
TC
Figure 6a. 240V heating element with 120V Buzzer
240V Buzzer
1
13
14
2
SWA-
3
2451B
+
4
-
11
12
5
TC
Figure 6b. 240V heating element with 240V Buzzer
The heater is driven by a SSR. Sometimes user may want to use the oven for a
preset time and use it multiple times. In this case a normally closed switch
should be used. When controller is on, the cooker will be heated up to 135° F.
The temperature will be hold for 20 minutes. Then the controller will turn off the
heater and turn on the buzzer automatically. User can press the NC switch to
reset the timer. When temperature is over 150° F, buzzer will be turned on
automatically. The parameters that need to be changed from the initial
value: SV = 135° F, ALP1 = 0, ALP2 = 1, AL2 = 150° F, UPT = 1, TE1 = 20,
INT = 1.
B. Espresso machine
M
Br ew Pump
1
13
14
2
W
SWA-
3
2451B
R
4
R
11
12
5
Figure. 7 Typical wiring for espresso machine with PID temperature control and
timer for brew control.
The heater is switched by a SSR. RTD sensor is used. For the brew control, a
rocker switch, or a normally open switch on the espresso machine for brew
should be used. When the switch turns on, the pump will run 25 second and
stop automatically. User need to turn off and turn on the switch again to make
another shot. The parameters need to be changed are: Sn = Pt, SV = 220,
ALP1 = 0, UPT = 2, TE1 = 25, INT = 5.
6. Trouble Shooting
2021.01
6
7
8
9
4 1
SSR
10
2
3
Heater
6
7
8
9
4 1
SSR
10
2
3
Heater
6
7
Fuse
8
9
Heater
4
1
SSR
10
3
2
N. O. Switch
6.1 Timer won't start
Check the connection between terminal 11 and 12. These two terminals must
be jumped together to enable the timer. A momentary NC switch on pin 11 and
12 can serve as a timer-reset switch.
6.2 No heating
N
The OUT LED is synchronized with output relay. If there is no heat when it is
supposed to, check the OUT first. If it is not lit, the controller parameter setting
L
120VAC
is wrong. If it is on, check external SSR (if the SSR's red LED is ON). If the SSR
is ON, then the problem is either the SSR, its wiring, or the heater. If the
L1
external switching device is not on, then the problem is either the controller
output, or the external switch device.
240VAC
L2
6.3 Poor accuracy
Please make sure calibration is done by immersing the probe in liquid.
Comparing with reference in air is not recommended because response time of
sensor depends on its mass. Some of our sensor has response time >10
minutes in the air. When the error is larger than 5 ° F, the most common
problem is improper connection between the thermocouple and the controller.
The thermocouple needs to be connected directly to the controller unless
thermocouple connector and extension wire is used. Copper wire or
thermocouple extension wire with wrong polarity connected on the
thermocouple will cause the reading drift more than 5 ° F.
L1
6.4 Under on/off control mode, although hysteresis is set to 0.3, unit is
running 5 degrees above and below.
240VAC
If the Hy is very small and temperature change very fast, user needs to
L2
consider the delay of the cycle time (the parameter t). For example, if cycle time
is 20 seconds, when the temperature passes the SV + Hy after the very
beginning of 20 seconds, relay will not act until it starts the next cycle 20
seconds later. The temperature could be much higher than the set point. User
may change the cycle time to a smaller value, such as 2 seconds, to get a
precise control.
6.5 Display "HH"
This is an input error message. The possible reasons are: the sensor is not
connected or not connected correctly; the sensor input setting is wrong; or the
sensor is defective. In this case, the instrument terminates its control function
automatically. If this happens when using thermocouple sensor, you can short
terminal 4 and 5 with a copper wire or paper clip. If the display shows ambient
temperature, the thermocouple is defective. If it still displays "HH", check the
input setting, Sn, to make sure it is set to the right thermocouple type. If the Sn
setting is correct, the controller is defective. For RTD sensors, check the input
setting first because most controllers are shipped with the input set for
thermocouples. Then check the wiring. The two red wires should be connected
to terminals 4 and 5. The white wire should be connected to terminal 3.
N
120V AC
L
6.6 Cannot change set temperature
Please check parameter dIH and dIL. These two parameters limit the set
temperature range. If you set dIH and dIL at the same value (like 100), the set
temperature (SP) can only be set as 100, and user cannot adjust it.
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Tel: 770-569-8420
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