EWELLY EW-988TK User manual

Version: 988 TK-366-V1.0
EW-988TK Operation Manual
Thank you for choosing Ewelly instruments. This product combines a wide range of refrigeration
technology, which is simple to operate with accurate temperature control and strong anti-interference
ability. It is suitable for a variety of refrigeration, heating equipment and automatic intelligent control
systems. The sensor produced by our company is packaged by a precise process, which has moisture-
proof function and stable performance.
Product Specification
1. Operating Voltage：AC220V±10％; 50HZ/60HZ
2. Output：10A/220V/AC; 10A/220V/AC
3. Power Consumption：≤3W
4. Working Environment：-10℃～50℃；RH≤90％
5. Control Range：-20℃/-5℉～105℃/220℉; (Factory setting: 12℃)
6. Resolution：-20~99.9℃ is 0.1℃; Accuracy: ±0.5℃ ; 100～105℃ is 1℃; Accuracy: ±1℃
-5℉~220℉ is 1℉; Accuracy:2℉
7. Input Signal：1-Off temp. sensor, standard cable length 20K×2m
8. Overall Dimension：80（Width）×32（Height）×70（Depth）mm;
9. Mounting Size：71（Width）×29（Height）mm；
Display Panel
Installation Requirement
1. Please make sure that the power supply voltage meets the required voltage of the instrument. The
deviation should be less than ±10％.
2. The sensor should be kept away from the power cable.
3. Strictly distinguish the interfaces of the sensor, power cable and the relay output.
Operation Instruction
1. Standby function：
Hold “ON/OFF” key for 3 s to enter standby mode, then it displays “ ”and all outputs are
disconnected.
In standby mode, press and hold the “ON/OFF” key for 3s to return to normal operation.
2. Locking function：
Under “Lock” mode, press and hold the “▲” key for 3 s to unlock along with buzzer sounds. This
meter would lock itself automatically after 30s without any actions.
3. Fast temperature setting
Under normal operation, press the "Set" key to display the control temperature (the value flashes).
Press “▲” and “▼” to adjust the parameter values.
Hold “▲” and “▼” key to adjust the parameter value quickly. (This is a general operation).
4. Parameter adjustment
Hold "Set" for 6s until the parameter code "HC" turns on, indicating that the system setting menu has
been entered. Switch the corresponding parameter codes by pressing “▲” and “
▼
”.
Press " Set" to display the parameter value of the corresponding parameter code (the value flashes);
Press “▲” and “▼” to adjust the parameter value.
Press "Set" to confirm the modified parameter value and return to the upper menu.
Under the system setting status, press "ON/OFF" to exit the menu setting and return to the normal
operation.
Under the system setting status, it returns to normal operation automatically when there is no action
in 6s.
5. One-click restore of preset parameters
Under normal operation, press and hold the “▼” key for 6s or more, the display panel flashes, and
all parameters will be reset to factory settings. (please make sure to record the setting parameters
in advance)
6. Stop/Silence buzzer alarm
Press any key to cancel the current buzzer alarm sounds, but the indicator light will not turn off until
the fault is removed.
7. System Menu
Code Description Setting Range Factory
Setting Explanation
HC Cooling
/Heating
C=Cooling
H=Heating
C -
CF Temp. Unit
Switch
C=Centigrade；
F=Fahrenheit C -
d Temp. Return
Difference
0.1～15℃
1～60℉ 2℃/5℉
The target temp. can be controlled
to be stable in a certain setting
range.
CA Temperature
Calibration -15~15℃ -60~60℉ 0 This parameter corrects the temp. when there is an error
Pt Time Delay 0 ～ 10 min 1 Protect the meter from frequent
start-up
HS Temp. Upper
Limit
Set temp. +1℃ ～ 80℃
/220℉ 80℃ Prevent temp. is set too high
LS Temp. Lower
Limit
-20℃/-5℉ ～ Set
temp.-1℃ -20℃ Prevent temp. is set too low
Up key
Down key
On/Off key
Set/Confirm/
Return key
Symbol Description Status Explanation Symbol Description Status Explanation
Cooling
Off Cooling stops Fahrenheit
Degree - -
On Cooling on Parameter
Setting On Parameter Setting
Flashing
Cooling stops
under cooling
mode Alarm Signal On Faulty
Heating
Off Heating stops Standby
Signal On Standby Mode
On Heating on Lock
Off Unlocked
On Locked
Flashing
Heating stops
under heating
mode
Centigrade
Degree
- -

Wiring Diagram
Trouble Shooting
Failures Causes
Solutions
No display when
power is on
Whether the power source is off;
or the temperature controller is
defective.
Check the power supply and replace
the fuse; check if there is input for
power terminal or arrange to change
controller with the distributors.
With display but not
operating
Set temp. is within the rest
interval; External
circuit
protection; Incorrect set running
mode.
Reset the required temperature control
value; check overrun and overload,
check overheat causes, and eliminate
the troubles before reset to work.
Displayed
temperature
unstable or
malfunction
Sensor circuit interfered; poor
connection; binding with other
power cords; circuit damage.
Separate sensor with power cord or
replace the shielded wire,
check
whether connecting terminal is
tightened.
Attention
1.Please read this manual carefully and follow the instructions while using the product. Connect
input/output plugs of power & sensor to the corresponding sockets by following wiring diagram
strictly. Tighten all the screws of
connection plugs, then connect the power afterwards. Otherwise,
it may affect the usage and control, and even result in damage in parts.
2. Keep this product from away moisture, corrosive air and high magnetic field. Otherwise, the
normal operation of this product will be affected.
3. All our products have passed strict quality inspections before leaving factory. We provide one -
year warranty for this product, which is limited to product itself and our company is not
responsible for any other joint and several liability.
If the product includes but not limited to the following damages caused by being used and installed
in unsafe environment, being connected to the load exceeds the allowable range of the product,
being disassembled and modified by the user, etc. Our company will not provide replacement or
maintenance service within the warranty period. Meanwhile, we will not be liable for any direct or
indirect damages caused.
The warranty certificate on the product is an important evidence for our product qualit
y assurance. Any
changes without authorization, damages, scratches and lose on the certificate, our company will not
provide any replacement or maintenance service for these products.
If you have any problem regarding to our products or service, please do not hesitate to contact us. We
will provide you with quality service and maintenance. Thank you.
Guangzhou Ewelly Automatic Control Co. Ltd.
http://www.eliweli.com
Unusual difference
between real temp.
and displayed temp.
Sensor installed incorrectly;
sensor line is too long that
causes high resistance; poor
connection; sensor damage.
Must install sensors correctly; increase
cross section of extension wire; ensure
sealing
property of connecting wires, water
and moisture proofing; replace sensor.
Cannot shut down
after reaching set
temperature
Sensor installed incorrectly,
unable to measure value
correctly; Contactor of
compressor defective.
Check whether sensor measures
temperature correctly; replace
contactor of compressor.
Relay works too
frequently
Temp. return difference was set
too small or incorrect settings for
the pressure protector.
Increase the temp. return difference
values; adjust the pressure protector
settings.
With “ ” displayed
Sensor line open or short circuit. Check connection between the sensor
wiring and coupling end.
E1
Function
Switch refrigeration and heating modes in parameter setting menu. “ ” is heating, “C” is refrigeration.
1. Refrigeration
Current temp.≥ set temp. + temp. return difference ( ) and the “Set time delay ( )” has been
delayed, the load relay is closed.
Current temp. ≤set temp.，the relay is disconnected and refrigeration stops.
2. Heating
Current temp. ≤ set temp. – temp. return difference ( ) and the “Set time delay ( )” has been
delayed, the load relay is closed and heating function starts.
Current temp. ≥ set temp.，the relay is disconnected and heating stops.
Alarm mode
1. When the sensor line is open or short circuit, the digital tube displays “E1”, the buzzer beeps and
the outputs will be disconnected, press any key to mute the alarm.
2. When the real temp.≥ “HS”
+d,the digital tube displays “HHH”
, the buzzer beeps
and all the outputs
will be disconnected, press any key to mute the alarm.
3. When the real temp.≥ “LS”
-d,the digital tube displays “LLL
”, the buzzer beeps and all the outputs
will be disconnected, press any key to mute the alarm.
·
·
·
·
Pt
Pt
d
d
H
Model: EW-988TK
Load Output
Alarm
Output
NTC
Sensor