iSMA CONTROLLI iSMA-B-FCU Manual de usuario
www.ismacontrolli.com
DMP242en | 1st Issue rev. 3 | 02/2022
iSMA-B-FCU
User Manual
Hardware
iSMA-B-FCU Hardware User Manual
www.ismacontrolli.com
DMP242en | 1st Issue rev. 3 | 02/2022
page 2 of 53
Table of Contents
1 Introduction ............................................................................................................................. 3
1.1 Revision History................................................................................................................................3
2 Safety Rules.............................................................................................................................. 4
3 Technical Specification .......................................................................................................... 5
4 Hardware Specification ......................................................................................................... 8
4.1 Dimensions .......................................................................................................................................8
4.2 Power Supply....................................................................................................................................8
4.2.1 24 V AC Power Supply for External Equipment..................................................................9
4.3 Terminals and Internal Connections...........................................................................................9
4.3.1 iSMA-B-FCU-HH....................................................................................................................... 10
4.3.2 iSMA-B-FCU-HL........................................................................................................................ 10
4.3.3 iSMA-B-FCU-LL ........................................................................................................................ 11
4.4 RS485 Communication................................................................................................................ 12
4.4.1 Connecting RS485 Communication Bus........................................................................... 12
4.4.2 RS485 Grounding and Shielding......................................................................................... 13
4.4.3 RS485 Netowrk Termination................................................................................................ 13
4.5 RJ12 Panel Connection................................................................................................................ 13
4.6 Front Panel and DIP Switches.................................................................................................... 14
4.6.1 USB1 Port ................................................................................................................................. 14
4.6.2 LED ............................................................................................................................................. 14
4.6.3 DIP Switch................................................................................................................................. 15
4.7 Default Settings............................................................................................................................. 18
4.7.1 Restoring Default Settings.................................................................................................... 18
5 Inputs and Outputs.............................................................................................................. 19
5.1 Inputs............................................................................................................................................... 19
5.1.1 Special Inputs .......................................................................................................................... 19
5.1.2 Digital Inputs............................................................................................................................ 21
5.2 Outputs ........................................................................................................................................... 21
5.2.1 Triac Outputs........................................................................................................................... 22
5.2.2 Digital Outputs ........................................................................................................................ 23
5.2.3 Analog Outputs ....................................................................................................................... 26
6 List of Supported Temperature Sensors ........................................................................ 28
7 MAC DIP Switch Addressing Table....................................................................................44
iSMA-B-FCU Hardware User Manual
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DMP242en | 1st Issue rev. 3 | 02/2022
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1 Introduction
The iSMA-B-FCU is a fully programmable controller, built with the aim of controlling the
FCU. The controller is factory-equipped with the two most popular open communication
protocols Modbus ASCII/RTU and BACnet MS/TP, which are selected using DIP switches.
To minimize time and simplify the commissioning process the controller is delivered with
universal application, which supports the most popular types of FCU. Dedicated DIP
switch allows adjusting parameters of the application. Additionally, in the BACnet
protocol, the application has the built-in function, which allows automatically to bind
master and slave controllers in groups.
In cases if the standard application does not meet the project requirements, it can be
modified or created from scratch. Changing of the application is possible in real-time by
USB port. There are three hardware versions which have different types of triac outputs
and power supply (iSMA-B-FCU-HH, iSMA-B-FCU-HL, iSMA-B-FCU-LL).
Table 1. FCU controllers
1.1 Revision History
Rev. Date Description
1.0 - First edition
1.1 - iSMA-B-FCU-LL hardware description added
1.2 - Company data update
1.3 28 Feb 2022 Rebranded
Table 2. Revision history
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DMP242en | 1st Issue rev. 3 | 02/2022
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2 Safety Rules
Improper wiring of the product can damage it and lead to other hazards. Make sure
that the product has been correctly wired before turning the power on.
Before wiring or removing/mounting the product, make sure to turn the power off.
Failure to do so might cause an electric shock.
Do not touch electrically charged parts such as power terminals. Doing so might cause
an electric shock.
Do not disassemble the product. Doing so might cause an electric shock or faulty
operation.
Use the product only within the operating ranges recommended in the specification
(temperature, humidity, voltage, shock, mounting direction, atmosphere, etc.). Failure
to do so might cause a fire or faulty operation.
Firmly tighten the wires to the terminal. Failure to do so might cause a fire.
Avoid installing the product in close proximity to high-power electrical devices and
cables, inductive loads, and switching devices. Proximity of such objects may cause an
uncontrolled interference, resulting in an instable operation of the product.
Proper arrangement of the power and signal cabling affects the operation of the entire
control system. Avoid laying the power and signal wiring in parallel cable trays. It can
cause interferences in monitored and control signals.
It is recommended to power controllers/modules with AC/DC power suppliers. They
provide better and more stable insulation for devices compared to AC/AC transformer
systems, which transmit disturbances and transient phenomena like surges and bursts
to devices. They also isolate products from inductive phenomena from other
transformers and loads.
Power supply systems for the product should be protected by external devices limiting
overvoltage and effects of lightning discharges.
Avoid powering the product and its controlled/monitored devices, especially high
power and inductive loads, from a single power source. Powering devices from a single
power source causes a risk of introducing disturbances from the loads to the control
devices.
If an AC/AC transformer is used to supply control devices, it is strongly recommended
to use a maximum 100 VA Class 2 transformer to avoid unwanted inductive effects,
which are dangerous for devices.
Long monitoring and control lines may cause loops in connection with the shared
power supply, causing disturbances in the operation of devices, including external
communication. It is recommended to use galvanic separators.
To protect signal and communication lines against external electromagnetic
interferences, use properly grounded shielded cables and ferrite beads.
Switching the digital output relays of large (exceeding specification) inductive loads can
cause interference pulses to the electronics installed inside the product. Therefore, it
is recommended to use external relays/contactors, etc. to switch such loads. The use
of controllers with triac outputs also limits similar overvoltage phenomena.
Many cases of disturbances and overvoltage in control systems are generated by
switched, inductive loads supplied by alternating mains voltage (AC 120/230 V). If they
do not have appropriate built-in noise reduction circuits, it is recommended to use
external circuits such as snubbers, varistors, or protection diodes to limit these effects.
iSMA-B-FCU Hardware User Manual
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DMP242en | 1st Issue rev. 3 | 02/2022
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3 Technical Specification
iSMA-B-FCU-HH iSMA-B-FCU-HL iSMA-B-FCU-
LL
Power
Supply
Voltage 230 V AC ± 10% 24 V AC ± 10%
Power Consumption Max. 12 VA (including 7 VA for triac outputs)
Special
Inputs
Temperature Input Measurement with attached RTDs
Resolution ±0.1°C
Accuracy ±0.2°C at 25°C
Voltage Input Voltage measurement from 0 to 10 VDC (Input impedance 120
KΩ)
Resolution ±6 mV
Accuracy ±50 mV
Resistance Input Resistance measurement from 0 to 700 kΩ
Measurement resolution ±20 Ω for 20 kΩ load
Dry Contact Input Output current ~0,2 mA
Measurement Resolution 12 bits
Digital Inputs Type Dry contact
Max. Input Frequency 100 Hz
Analog
Outputs
Voltage Range 0 to 10 V DC
Max. Load Current 5 mA
Resolution 12 bits
Accuracy ±1%
Digital
Outputs
(Relays)
Resistive Load (FAN, CTG) 6 A at 230 V AC or 6 A at 30 V DC
Inductive Load AC3 (FAN, CTG) 75 VA at 230 V AC or 10 W at 30 V DC
Resistive Load (HTG) 10 A at 230 V AC or 10 A at 30 V DC
Inductive Load AC3 (HTG) 1/2 HP at 230 V AC
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DMP242en | 1st Issue rev. 3 | 02/2022
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Triac
Outputs
Load Min.: 20 mA
Max.: 0.5 A at 230 V
AC
Min.: 20 mA
Max.: 0.3 A at 24 V
AC
Imax = 0.3 A = ITO1 +
ITO2 + I24VOut
Min.: 20 mA
Max.: 0.5 A at 24
V AC
Peak Load per Channel 1.5 A (30 s)
Gate Control Zero crossing turn ON
Frequency Range 47 to 63 Hz
Snubber Snubberless Triac
Power
Supply
Output
Power Supply Output 24 V AC ± 20%, 7 VA 24 V AC ± 20%, 7 VA** In HL this power
supply is also used for triac outputs
RS485
Interface
RS485 Up to 128 devices
Failsafe Receiver (Bus Open, Bus Shorted, Bus Idle)
Communication Protocols Modbus RTU, Modbus ASCII or BACnet MS/TP set by switch
Baud Rate From 2400 to 115200 set by switch
Address 0 to 255 set by DIP switch
RJ12
Interface
RS485 Up to 128 devices
Communication Protocol Modbus RTU
Baud Rate From 2400 to 115200
Power Supply 34 V DC ± 15%, 2.5 W
USB USB Mini USB 2.0
Ingress
Protection
IP IP40
Temperature Storage – 40°C to +85°C
Operating 0°C to +50°C
Humidity Relative 5 to 95%
Connectors Inputs / Outputs,Power Supply
and Communication
Removable
HTG Relay Constant
Maximum Cable Size 1.5 mm2
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DMP242en | 1st Issue rev. 3 | 02/2022
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Dimensions Width 123 mm
Length 137 mm
Height 55 mm
Table 3. Technical specification
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DMP242en | 1st Issue rev. 3 | 02/2022
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4 Hardware Specification
4.1 Dimensions
Figure 1. Dimensions
4.2 Power Supply
The iSMA-B-FCU-HH and iSMA-B-FCU-HL versions are designed to work with the 230 V AC
power supply. Each iSMA-B-FCU device is equipped with a built-in 6 A fuse protecting the
controller and the connected 230VAC equipment.
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DMP242en | 1st Issue rev. 3 | 02/2022
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Figure 2. 230 V AC power supply
The iSMA-B-FCU-LL version is designed to work with the 24 V AC power supply. The
device is equipped with a built-in 6A fuse protecting the controller and the connected 24
V AC equipment.
Figure 3. 24 V AC power supply
Note: Total current for digital relay outputs O1-O4 cannot exceed 6A.
4.2.1 24 V AC Power Supply for External Equipment
The iSMA-B-FCU-HH is equipped with a 24 V AC, 7 VA power supply output to supply an
external equipment like sensors and actuators. This power supply uses a separate coil in
the transformer. The 24 V AC power supply terminal connection is labeled L2, N2.
The iSMA-B-FCU-HL is equipped with a 24 V AC power supply output for thermal valves
controlled by triac outputs and external devices like sensors and actuators. This power
supply uses a separate coil in the transformer. The 24 V AC power supply terminal
connection is labeled L2, N2. The total power consumption with thermal valves and
external devices cannot exceed 7 VA (~0.3A).
The iSMA-B-FCU-LL is equipped with a 24 V AC, 7 VA power supply output to supply the
external equipment like sensors and actuators. This power supply uses a separate 24 V
AC transformer. The external separate power supply terminal connection is labeled L2,
N2.
4.3 Terminals and Internal Connections
There are 3 types of hardware available:
WARNING! It is forbidden to use a fuse with current exceeding 6 A! Higher current
may permanently damage the device and cause danger to the user and to the
equipment!
iSMA-B-FCU Hardware User Manual
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DMP242en | 1st Issue rev. 3 | 02/2022
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iSMA-B-FCU-HH with 230 V AC power supply and triac outputs;
iSMA-B-FCU-HL with 230 V AC power supply and 24 V AC triac outputs;
iSMA-B-FCU-LL with 24 V AC power supply and triac outputs.
4.3.1 iSMA-B-FCU-HH
The iSMA-B-FCU-HH hardware version has a high voltage power supply (230 V AC) and
high voltage triac outputs (230VAC). The triac outputs are connected directly to the main
controller power supply, as presented in the diagram below. The maximum current for
each triac output is 0,5 A. The maximum power consumed by the external equipment
connected to 24V terminals (L2, N2) cannot exceed 7 VA in total.
Figure 4. iSMA-B-FCU-HH diagram of terminals and internal connections
4.3.2 iSMA-B-FCU-HL
The iSMA-B-FCU-HL hardware version has a high voltage power supply (230 V AC) and low
voltage triac outputs (24 V AC). The triac outputs are connected to a built-in 24 V AC
transformer, as shown in the diagram below. The maximum power consumed by the
external equipment connected to the triac outputs and to 24V terminals (L2, N2) cannot
exceed 7VA in total.
Este manual sirve para los siguientes modelos
3
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