iSMA iSMA-B-FCU Series, iSMA-B-FCU-HH, iSMA-B-FCU-LL, iSMA-B-FCU-HL User Manual

iSMA-B-FCU

User Manual

FCU Hardware

Global Control 5 Sp. z o.o.

Warsaw, Poland
www.gc5.pl

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Table of contents

1 Introduction 3

1.1 Document change log 3

1.2 Safety rules 3

1.3 Technical specifications 4

1.4 Dimensions 6

2 Hardware specification 7

2.1 Diagram of terminals and internal connections 7

iSMA-B-FCU-HH 7
iSMA-B-FCU-HL 8
iSMA-B-FCU-LL 9

2.2 Power supply connection 10

24V AC power supply for external equipment 10

2.3 Connecting the communication bus (RS485) 11

RS485 grounding and shielding 11
RS485 network termination 11

2.4 RJ12 Panel connection 12

2.5 Mini USB Port 12

2.6 Front panel LED functions 12

2.7 Setting controller address 13

2.8 Baud rate selection 14

2.9 Protocol selection 15

2.10 Restoring the default settings 15

2.11 Default settings 15

2.12 CFG DIP switch 16

3 ISMA-B-FCU device inputs 17

3.1 Special Inputs 17

Special Inputs operating as digital inputs 17
Special Inputs operating as 0-10 V DC analog inputs 18
Special Inputs operating as resistance inputs 18
Special Inputs operating as temperature inputs 19

3.2 Digital Inputs 20

Digital Input fast counter 20

4 ISMA-B-FCU device outputs 21

4.1 Triac Outputs 21

4.2 Digital Outputs 22

O1 – O3 relays “Fan” 22
O4 – HTG relay “Electrical Heater” 22
O5 – CLG relay “Electrical Cooler” 23

4.3 Analog Outputs 24

5 MAC DIP SWITCH addressing table 26

6 List of supported temperature sensors 32

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1 Introduction

This document presents ISMA-B-FCU device hardware information.

1.1 Document change log

V1.1 – iSMA-B-FCU-LL hardware description added

1.2 Safety rules

• Please note: incorrect wiring of this product can cause its’ damage and may result in other

hazards. Make sure the product has been correctly wired before turning the power ON.

• Before wiring, or removing / mounting the product, be sure to turn the power OFF. Failure to

do so might cause electric shock.

• Do not touch electrically charged parts such as the power terminals. Doing so might cause

electric shock.

• Do not disassemble the product. Doing so might cause electric shock or faulty operation.

• Use the product within the operating ranges recommended in the specification (temperature,

humidity, voltage, shock, mounting direction, atmosphere etc.). Failure to do so might cause
fire or faulty operation.

• Tighten the wires firmly to the terminal. Insufficient tightening of the wires to the terminal

might cause fire.

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1.3 Technical specifications

iSMA-B-FCU-HH

iSMA-B-FCU-HL

iSMA-B-FCU-LL

Power supply

Voltage

230V AC ± 10%

24V AC ± 10%

Power consumption

Max 12VA (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

100Hz

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)

6A at 230V AC or 6A at 30V DC

Inductive load AC3

(FAN, CTG)

75VA at 230 V AC or 10 W at 30 V DC

Resistive load (HTG)

10A at 230V AC or 10 A at 30 V DC

Inductive load AC3

(HTG)

1/2 HP at 230 V AC

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

I

max

= 0.3 A =

I

TO1

+ I

TO2

+ I

24VOut

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

RS485

Up to 128 devices

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Interface

Failsafe Receiver (Bus Open, Bus Shorted, Bus Idle)

Communication

protocols

Modbus RTU, Modbus ASCII or BACnet MSTP

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

Dimensions

Width

123 mm

Length

137 mm

Height

55 mm

Table 1 Technical specification

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1.4 Dimensions

Figure 1 iSMA-B-FCU dimensions (all versions)

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2 Hardware specification

2.1 Terminals and internal connection diagram

There are 3 types of hardware available:

• 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.

2.1.1 iSMA-B-FCU-HH

iSMA-B-FCU-HH has a high voltage power supply (230 V AC) and high voltage Triac Outputs
(230 V AC). The Triac Outputs are connected directly to the main controller power supply as
presented in diagram below. The maximum current for each Triac Output is 0.5 A. The maximum
power consumed by external equipment connected to the
24 V terminals (L2, N2) cannot exceed 7VA in total.

Figure 2 iSMA-B-FCU-HH diagram of terminals and internal connections

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2.1.2 iSMA-B-FCU-HL

iSMA-B-FCU-HL 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 below
diagram. The maximum power consumed by the external equipment connected to the Triac
Outputs and to 24 V terminals (L2, N2) cannot exceed 7 VA in total.

Figure 3 iSMA-B-FCU-HL diagram of terminals and internal connections

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2.1.3 iSMA-B-FCU-LL

iSMA-B-FCU-LL has a low voltage power supply and Triac Outputs (24 V AC). The Triac Outputs are
connected to power supply terminals. The maximum current for each of the Triac Outputs is 0.5 A.
The maximum power used by external equipment connected to the 24 V terminals (L2, N2) cannot
exceed 7 VA in total.

Figure 4 iSAM-B-FCU-LL diagram of terminals and internal connections

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2.2 Power supply connection

iSMA-B-FCU-HH and iSMA-B-FCU-HL are designed to work with 230 V AC power supply. Each ISMA­B-FCU device is equipped with a built-in 6 A fuse protecting the controller and connected 230 V AC
equipment.

Figure 5 230 V AC Power supply connection

iSMA-B-FCU-LL is designed to work with 24 V AC power supply. The device is equipped with a built­in 6 A fuse protecting the controller and connected 24 V AC equipment.

Figure 6 24 V AC Power supply connection

Note: Total current for digital relay outputs O1-O4 cannot exceed 6A.

Note: 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!

2.2.1. 24 V AC power supply for external equipment

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.
24 V AC power supply terminal connection is labeled L2, N2.

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. 24 V AC power supply terminal connection is labeled L2, N2. The total power

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consumption with thermal valves and external devices cannot exceed 7 VA (~0.3 A).

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.

2.3 Connecting the communication bus (RS485)

Figure 7 RS485 connection

2.3.1 RS485 grounding and shielding

This device can be exposed to electromagnetic field. Electromagnetic radiation can induce
electrical noise into both power and signal lines, as well as direct radiation into the FCU device with
negative results for the system. Appropriate grounding, shielding and other protective steps should
be taken at the stage of installation to prevent these effects. These protective steps include
grounding the control cabinet and the cable shield, installing protective elements for
electromagnetic switching devices, correct wiring, as well as proper choice of cable types and their
cross sections.

2.3.2 RS 485 network termination

Transmission line effects often present a problem for data communication networks. These
problems include reflections and signal attenuation.

To eliminate the presence of reflections of signal from the end of the cable, the cable must be
terminated at both ends with a resistor across the line adequate to its characteristic impedance.
Both ends must be terminated since propagation is bidirectional. In case of an RS485 twisted
pair cable this termination is typically 120 Ω.

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2.4 RJ12 Panel connection

RJ12 socket is designed for connecting external modules and LCD panel. The ISMA-B-FCU
device has two parallel sockets with the same pin configuration. Those sockets provide
communication in Modbus RTU protocol.

RJ12 socket provides also power supply dedicated for external LCD panels with maximum load
up to 2.5 W. Before connecting devices powered from RJ12 please calculate the power supply
load. Power consumption of the dedicated wall panel iSMA-B-LP with temperature sensor is 0.5
W, so the maximum number of panels on the bus is 5.

RJ12 pins are shown in the figure below.

Figure 8 RJ12 pin description

For short distance, up to 100 m, it is recommended to use the following cables for connection:
standard category 3, 4 wire or 6 wire telephone cable straight without crossing (for example
YTLYP 6x0.12). For longer distance, it is recommended to use twisted shielded Modbus standard
cable.

2.5 Mini USB Port

The iSMA-B-FCU device has a built-in mini USB port designed to manage controller firmware and
application, as well as for diagnostics.

This USB port also provides controller power supply for commissioning processes and for
application diagnostics. When the controller is powered up by a USB, all inputs and outputs are
operational (except for Triac Outputs which require external power supply).

2.6 Front panel LED functions

The ISMA-B-FCU device is equipped with 4 LED diodes for quick status check and diagnostics:

• Power LED lights up (green) after turning the power on.

• Communication LED lights up (orange) for 20 ms after sending each package through the main

RS485 port. As long as module receives/sends packages, the Communication LED blinks
continuously.