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2021.10
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10.4 Control a small load without using any external SSR or relay
.
a. Wiring diagram
6
7
8
9
10
11
12
13
14
1
2
3
4
5
J2
+ -
K type TC
L
N
Fuse
Heater/cooler
120VAC
Figure 13. Typical wiring set up for driving a 120V AC heater or cooler directly.
Only low power device can be wired in this way. The current limit for resistive
load is 3 Amp. The current limit for inductive load is lower, depending on the
inductance.
b. Parameter setting. These are the parameters that need to be changed from the
initial value: outy= 1, 4 or 5 for J2 relay output depending the control mode. ot=20
to increase the relay life time. Rd=1 if the load is a cooling device.
10.5 Drive a 120V solenoid valve directly in cooling mode
a. Wiring diagram
6
7
8
9
10
11
12
13
14
1
2
3
4
5
J2
L
N
S
120V
Solenoid valve
120VAC
Fuse
RTD
R
R
W
Alarm
120V buzzer
Figure 14. A simple auto draw-off system setup for maple syrup. Only low power
solenoid valve (cooler) can be wired in this way. The current limit for resistive
load is 3 Amp. RTD sensor is used for better accuracy (e.g.
). One 120V
buzzer is wired to the J1 relay, to work as a high temperature alarm.
b. Parameter setting. Set SV = 219° F. To use solenoid valve as a cooling device,
please set outy = 4 (on/off mode), and rd = 1 (cooling mode). Set ot = 20 to increase
the relay life time. Adjust Hy (hysteresis band) accordingly.
11. Error Message and trouble shooting
11.1 Display EEEE
This is an input error message. The possible reasons are, the sensor is not
connected correctly; the input setting is wrong type; or the sensor is defective. If
this happens when using thermocouple sensor, you can short terminal 9 and 10.
If the display shows ambient temperature, the thermocouple is defective. If this
happens when using the RTD sensor, check the input setting first because most
controllers are shipped with input set for thermocouple. Then check the wiring. The
two red wires should be on terminal 9 and 10. The clear wire should be on terminal
8.
11.2 No heating
When controller output is set for relay output, the “AL2” LED is synchronized with
output relay. Wh
en controller output is set for SSR output, the “OUT” LED is
synchronized with SSR control output. If there is no heat when it is supposed to,
check the AL2 or OUT first. If it is not lit, the controller parameter setting is wrong.
If it is on, check external switching device (if the relay is pulled-in, or the red LED
of the SSR). If the external switching device is on, then the problem is either the
external switching device output, its wiring, or the heater. If the external switching
device is not on, then the problem is either the controller output, or the external
switch device.
11.3 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. A copper connector, copper wire, or thermocouple
extension wire with wrong polarity connected on the thermocouple will cause the
reading drift more than 5 ° F.
Auber Instruments Inc.
5755 North Point Parkway, Suite 99,
Alpharetta, GA 30022
www.auberins.com
Email: [email protected]
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