Ebimicro MFCTH User manual

https://ebimicro.com
Hoogkamerstraat 188, 9140 Temse
Oos-Vlaanderen Belgium
[phone]
e-mail: [email protected]
MFCTH
Temperature and Humidity Controller
User Guide
Version 1.1

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CONTENTS
Introduction................................................................................................................................................................................3
Installation ..................................................................................................................................................................................4
Wall mounting installation:......................................................................................................................................................4
Wiring:................................................................................................................................................................................................4
MFCTH Typical wiring diagram..................................................................................................................................................5
Power Supply: .......................................................................................................................................................................................6
Modbus RTU connection: ...............................................................................................................................................................7
Sensor connection:..........................................................................................................................................................................10
Analog Output:...................................................................................................................................................................................14
Relay Output:......................................................................................................................................................................................15
DEVICE HARDWARE SETTING ........................................................................................................................................16
DEVICES MENU SETTING...................................................................................................................................................16
Menu structure and guidance:.............................................................................................................................................. 16
➢Temperature set point...........................................................................................................................................................17
➢Relative Humidity set point.................................................................................................................................................17
➢Heat/Cool Mode........................................................................................................................................................................18
➢Humidifying/Dehumidifying mode..................................................................................................................................18
➢Use Multiple sensors...............................................................................................................................................................18
➢Number of sensors...................................................................................................................................................................19
➢Network Settings......................................................................................................................................................................19
➢Output Type................................................................................................................................................................................20
➢PID Enable...................................................................................................................................................................................20
➢Open Collector Output ...........................................................................................................................................................20
➢Reset ..............................................................................................................................................................................................20
➢Standby.........................................................................................................................................................................................20
MODBUS REMOTE CONTROLLING/MONITORING APPLICTION (Ebicon)...................................................20

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INTRODUCTION
MFCTH is a temperature and humidity controller made for industrial use under specific condition
but as well can be widely used as the environmental condition is covered by the device
specification. The controller will be delivered with a high quality temperature and relative
humidity sensor from Senserion AG (Switzerland) with high precision and very stable in long term.
And it can be powered with typical industrial voltage (+24VDC) but as well with a voltage range of
12-36VDC.
Its communication protocol (MODBUS RTU) makes it capable of logging data to a PC and as well
being controlled and monitored remotely from distance(1200m).
A free of charge application (Ebicon) can be downloaded to control and monitor the controller
and also logging the data locally.
A mixed output can help you have different possibilities from analog to relay controlling according
to your needs.
The device has PID control function which helps to have smarter control of your environmental
temperature and relative humidity and more energy efficiency .
Its high rank protection makes its life time much longer and make it capable to operate in different
conditions like humid, dusty and greasy environments.
On top of all the good quality and reliability of our device (which make us proud of) , a default
guarantee of 3 years (on all our products) makes you more sure of having a good support and
insured investment.

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INSTALLATION
⚠Please read the installation instruction step by step and make sure all steps are followed
before powering up your device or connecting to your PC.
Note: MFTCH is designed to be mounted on wall but if installing it on din rail required you can use
our din rail kit(adaptor). Because MFCTH is IP64 protected it’s possible to install it at industrial
environment but under its specification (please refer to the device datasheet for more info
available on https://ebimicro.com/mfcth/ )
Wall mounting installation:
You can follow the enclosure dimension on MFCTH datasheet to install the device but
Before mounting MFCTH on the wall please note the following:
•To give your device a longer life time try to install it in an environment covered from direct
son light(the enclosure is NOT UV protected) and it the temperature range of -10 to 50°C.
•The sensor can be connected with maximum 2meter length cable without repeater. This
can go up to 7 meters by using SM8 multiplexer and I2CR repeater and up to 35 meters
by using I2CRL repeater/ line extender.
Wiring:

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MFCTH Typical wiring diagram
24VDC
+ -
USB/
RS485
120R 120R
Slave n Slave
n+1
OR
Heat/Cool system
Humidity system
Heat/Cool system
Humidity system
Relay
output 1
Relay
output 2
Analog
Output 1
(A1/GND)
Analog
Output 2
(A2/GND)
DO NOT MIX ANALOG AND RELAY
OUTPUT IN CASE OF USING AC MOTOR
CONTACTOR.
GND_Sensor
SDA_Sensor
SCL_Sensor
V+_Sensor
GND
24V DC
RS485A
RS485 /B
GND_Analog Output1(Temp)
Analog Output1(Temp)
GND_Analog Output2(Rh)
Analog Output1(Rh)
Relay Output2(Rh)
Relay Output1(Tmp)
SHT2x/SHT3x
(*Follow the wiring
diagram printed on PCB)
MFCTH

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Follow the wiring label printed on the PCB and match the connection to the following instruction
step by step:
Power Supply:
Prepare a stable DC power source between 12 to 36 VDC (24V recommended) and follow the
terminal labeling to connect it to MFCTH.
⚠Make sure the power is off before and until the installation is completely done.

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Modbus RTU connection:
Connection Port
Each device [MASTER or SLAVE] has a connection port with 2 terminals that are used to
communicate with that particular device over MODBUS RTU –RS485. These terminals are mostly
marked as A [or DATA +] and B [or DATA -]. The cabling is done such that all these devices are
connected in parallel. This means that all the A terminals should be connected together and all the B
terminals should be connected together
QUICK TIP- Reversing the ‘A’ and ‘B’ connections of a device can lead to NOT being able to
communicate with that device. In many cases, the whole communication systems can stop working
owing to the reverse polarity [voltage] found on the terminals of incorrectly connected device
In order to avoid this problem, it is recommended that the cable of same color should be used to
connect all A terminals together and similarly cable of same color [but different that the color used
for A] to be used to connect all B terminals together.
Connection between the devices
The easiest and the best way to connect the devices in a MODBUS RTU –RS485 communication is
using DAISY CHAIN method. It is shown below. Any other way of connecting the devices together is
not recommended as it might cause communication issues or damage to the overall system.

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Maximum distances and number of slaves
The maximum length of the communication cable should be no longer than 800m [recommended].The
maximum number of devices that can be connected over this network can be 32[for Modbus RTU],
including the master device [The PC in our case]
*apart from the network, No. of slaves also depend on the data logger specification.
Terminal Resistances
In order to avoid signal reflections, it is required to turn on the 120 ohm terminal resistance at ends
of the communication cable. In our case, we are required to turn ON the terminal resister of the last
device. In some cases, it is also required to turn ON the terminal resister of the first device.
Note: The terminal resistor is assembled on the PCB and you can turn it on/off (Enable/ Disable) if
the condition of your network falls in above situation. To activate the terminal resistor please
follow the related instruction for modifying menu on the device or use Ebicon application.
Grounding
For MODBUS communications, properly grounding your instrument is important, especially when
working close to high voltage sources such as PV arrays. An instrument that is not appropriately
grounded can give false readings, fail completely or turn into a safety hazard
QUICK TIP-If you are encountering noise or irregular or abnormal problems with a Modbus serial
link, the problem is likely related to grounding, incorrect shielding, or wiring power wires next to
Modbus wiring.
Type of cables to use
For MODBUS communications, a shielded and twisted pair cable is used. One example of such cable
is Belden 3105A. But any cable with similar characteristics can be used to connect all the devices
together. The shielding can be of 2 types: braided [like a mesh of thin conducting wires] or like a foil
[consiting of a thin sheet of metal covering the twisted wires]. Both types of shielding are OK.

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QUICK TIP- This arrangement improves immunity to electromagnetic disturbances because the cable
forms a series of successive coils, each of which faces in the opposite direction to the next one: in
this manner any magnetic field in the environment traverses each pair of coils in opposite directions
and its effect is thus very reduced (theoretically, the effect on each coil is exactly the opposite of the
effect on the next one and thus the effect is cancelled).
Wiring characteristics:
•0.22–0.5 mm2 for runs up to 300 meters
•0.5–0.75 mm2 for runs up to 1200 meters
•Characteristic impedance: 120 Ohm +/- 10%;
•Use Shielded twisted-pair cable if the bus cable exceeds 3m.
•Each shield must be grounded at one side only
•Overvoltage/overcurrent transient protection should be provided

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Sensor connection:
The controller detects and reads both SHT2x and SHT3x sensors automatically. Of course it’s
possible to connect one sensor directly to the controller at the time but it’s also possible to read
multiple sensors (up to 8 sensors) in case if required.
Single sensor connection:
For a simple single sensor connection, you need to follow wiring label printed on PCB board. The
maximum cable length is recommended to be maximum 2 meters. If a longer connection is
required it’s possible to use one of our I2C bus repeater(I2CR) or I2C bus repeater/line
extender(I2CRL).
Multiple sensors connection:
It’s possible to connect a sensor multiplexer (SM8) to MFCTH which allows you to read multiple
sensor(up to 8 sensors) with a milliseconds time delay. In case of using sensor multiplexer, MFCTH
will make an average of both temperature and humidity measured by the sensors. To active this
function you need to go to the related menu using the MFCTH keypad on the device or by using
our Modbus master software (Ebicon) as following:
1. Connect a SM8 multiplexer to your MFCTH controller by following the wiring label printed
on PCB.
2. Connect your sensors to SM8 (follow wiring instruction of SM8 Datasheet).