Thermocable ProReact DSCU-EN User manual

Page 1 of 17 Revision 1.1 Sept 2019
Document No. ProReact DSCU-EN Installation Manual
ProReact Digital Sensor Control Unit
(DSCU-EN)
Installation Instructions
World leading linear detection
Page 1 of 17 Revision 1.1 Sept 2019
Document No. ProReact DSCU-EN Installation Manual
www.thermocable.com
Linear Detection Technology Made Simple

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Document No. ProReact DSCU-EN Installation Manual
Contents:
Important Guidelines – read before commencing installation Page 3
General Overview Page 4
Technical Specications Page 5
Installation Page 6
- Overview
- Connections Diagram
Operating Modes Page 7
- Wiring Diagram: Independent
- Wiring Diagram: Interlock
Useful Information Page 9
- Leader Cable
- Mounting Dimensions
- Static Discharge Cautionary
Commissioning Page 10
- Normal Operation
- Fault / Alarm Conditions
Testing and Verication Page 14
Two-wire RS-485 Modbus RTU/ASCII Communications Page 15
Resetting the ProReact DSCU-EN Page 16
Glossary Page 17

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Document No. ProReact DSCU-EN Installation Manual
Important Guidelines
Please read this instruction leaet thoroughly before commencing installation.
Install the Digital Sensor Control Unit (DSCU-EN) accordingly to meet local and country
installation requirements.
The DSCU-EN must be installed in accordance with BS 5839-1:2017 (or country
equivalent) and IEC 60364 and authorities having jurisdiction.
Ensure the product is installed, commissioned and maintained by qualied
professionals according to good engineering practices and who have received
sucient training on the unit.
Only use Thermocable ProReact EN Digital Linear Heat Detection cable with the
DSCU-EN sensor control unit.
Test the Digital Linear Heat Detection cable before connecting it to the DSCU-EN using
a multimeter.
Ensure the end of line resistor (3.6kohm) is securely connected at the end each linear
heat detection cable.
If only one zone is required leave the end of line resistor (3.6kohm) connected across
the terminals of the unused zone.
Ensure any cable glands used are tightened to form a secure and moisture proof seal
around the detection cable and any other cable in or out of the unit.
Do not exceed the maximum operating voltage of the DSCU-EN (36Vdc).
Do not connect lengths of linear heat detection cable in ‘T’ connections or spurs.

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Document No. ProReact DSCU-EN Installation Manual
General Overview
Digital Sensor Control Unit
The Thermocable ProReact Digital Sensor Control Unit (DSCU-EN) is a
dual zone module for monitoring up to two zones of Thermocable
ProReact EN Digital Linear Heat Detection (LHD) Cable. If an overheat or
re situation triggers either zone of the Digital LHD cable the unit
automatically calculates and displays the distance along the cable, in feet
and metres, to the alarm point. The two zones can operate independently
of each other, or in interlock mode and a separate alarm and normally
conducting fault output are provided for each zone. The unit is intended
to be installed between the Digital Linear Heat Detection cable and
a conventional or addressable re alarm control panel. It has power,
fault and alarm lights, as well as volt free outputs for fault and alarm,
corresponding to each zone. It may also be connected to a industrial
process control system using the two wire RS-485 Modbus RTU/
ASCII output.
Figure 1: Typical Installation of the ProReact Digital Sensor Control Unit
ProReact EN
Digital LHD
Cable
ProReact EN
Digital LHD
Cable

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Document No. ProReact DSCU-EN Installation Manual
Technical Specications
Thermocable Part Number: A1397
Thermocable Part Description: ProReact Digital Sensor Control Unit
UL Model Number: DSCU-EN
UL File Number: S36157
Revision: 1.9.2-EN
Approvals: EN54-28:2016
Enclosure:
...Dimensions H180mm x W120mm x D60.5mm (H7.1in x W4.72in x D2.38in)
...Rating NEMA 4, 4X (IP65)
...Finish Light Gray with clear lid
...Display 2 line, 16 character backlit display showing zone status
Power Requirements: All circuits power limited if powered from a power limited supply
Min. Nominal Max.
...Operating Voltage 12Vdc — 24Vdc — 36Vdc
Current Consumption:
...Normal Operation (standby) <15mA <7mA <5mA
...Alarm <40mA <23mA <15mA
Operating Temperature Range: -20°C – +50°C (-4°F – +122°F)
Terminal Blocks:
...Spacing 5mm Rising Clamp
...Rating 16A
...Wire Size 0.08mm2(28AWG) to 4mm2(11AWG)
Supervised Circuits: Power, Input Zone 1 & Input Zone 2
Inputs: Up to two Class B zones of Thermocable ProReact EN Digital
LHD Cable
...Max Zone Length 1000m (3,280ft)
...Min Zone Length 1m
...End of line resistor 3.6kohm (included)
...Short circuit current 0.5mA
...Max Zone Voltage 5V
Outputs:
...Communications Two wire RS-485 Modbus RTU/ASCII
...Sounder 2.4kHz 92dBa @ 10cm Buzzer
...Alarm 2x Form C volt-free relay contacts (resistive, common)
Max V 30Vac or 42.4Vdc
Max Current 2A
Max Switching Power 60W, 62.5VA
...Fault 2x Optoisolated phototransistor output (resistive, common)
Max V 35Vdc
Max Current 80mA
Max Power Dissipation 150mW

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Overview
The DSCU-EN allows accurate location of an alarm point along a length of Thermocable ProReact EN Digital Linear Heat Detection (LHD) cable.
It continuously monitors up to two zones of Digital LHD cable for a fault (open circuit) or an alarm (overheat or re condition). Because of the wide
range of applications that Digital LHD cable can be used for, it may not always be possible, or be too time consuming, to locate where along the cable
an alarm has occurred. Using the DSCU-EN, when an alarm occurs the distance to the overheat condition is immediately calculated and displayed on the
integrated display.
If a fault is detected, the corresponding fault output stops conducting, triggering a fault at the re alarm control panel. If an alarm is detected, the
corresponding alarm output changes state, triggering an alarm at the re alarm panel. The fault outputs also stop conducting on power loss to the unit or
microprocessor fault, triggering a fault at the re alarm control panel.
The two wire RS-485 Modbus RTU/ASCII output also outputs the current state of both zones. See the section “Modbus RTU/ASCII Communications” for
more detail.
There are two primary congurations of the DSCU-EN (see gure 1):
1) The Digital LHD cable can be connected directly to the DSCU-EN
2) The Digital LHD cable is connected to a length of leader cable which is connected to the DSCU-EN. In this scenario the leader cable must be
“calibrated out” during commissioning of the DSCU-EN.
Connections Diagram
Figure 3 shows the connections diagram for the DSCU-EN unit. The unit is provided with a 3.6kohm end of line resistor in each zone input. If only one zone
is required, leave the 3.6kohm resistor connected across the zone which is not in use. Otherwise the 3.6kohm resistor should be connected at the end of the
Digital Linear Heat Detection cable.
Figure 3: Wiring Diagram for the Thermocable ProReact DSCU-EN
Installation

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Operating Modes Wiring Diagram Independent
There are two operating modes for the Digital Sensor Control Unit:
1. Independent – This is when the DSCU-EN is used as a two zone system. When a fault or overheat condition occurs on a Digital LHD zone, the corresponding
fault or alarm output respectively is triggered. The two zones operate independently and both sets of outputs should be connected to a re alarm control
panel. If the zone is not required leave the 3.6kohm resistor in the zone input terminals as supplied. In this mode, the two zones can either contain identical
rated temperature Digital LHD cables or two different rated temperature Digital LHD cables.
Zone/Switch/
IO Module
Zone/Switch/
IO Module
Zone/Switch/
IO Module
ProReact Digital Sensor
Control Unit
ProReact
end-of-line
unit (EOLU-EN)
The EOL and A resistor are usually provided with the fire alarm panel or zone/switch/IO module. For
more information please refer to the Fire alarm panel or addressable module installation instructions.
On each zone output group, the Fault '-' (negative terminal) and alarm NO terminal are connected
by a jumper on the DSCU-EN PCB. Do not remove or break this jumper when the system is used with
an EN54 fire alarm system in the wiring configuration shown.
DSCU-EN
Alarm Relay
DSCU-EN
Fault Output
ProReact EN Digital Linear Heat Detection Cable Zones

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Operating Modes Wiring Diagram Interlock
2. Interlock – this mode is for applications which require a fail-safe guarantee that an alarm is only triggered when an overheat condition has been detected.
This mode may also be known as coincidence detection. In this case, the same rated temperature Digital LHD cable should be attached to both zones of the
DSCU-EN. The alarm output is only activated when both Digital LHD cables trigger an alarm due to an overheat condition. If one Digital LHD cable zone input
registers an alarm but the second does not, the alarm output will not be activated. This is to prevent an alarm if a mechanical or other issue has triggered one
Digital LHD cable and not an overheat condition.
• Only use Zone 1 fault and alarm outputs in Interlock mode.
• Two linear heat detection cables with the same temperature rating must be used and a
minimum of two linear heat detection cables must be installed in each protected space.
See the ProReact EN Digital LHD Installation Instructions for the linear spacing specication.
Zone/Switch/
IO Module
Zone/Switch/
IO Module
ProReact Digital Sensor
Control Unit
ProReact EN Digital Linear Heat Detection Cable Zone
The EOL and A resistor are usually provided with the fire alarm panel or zone/switch/IO module. For
more information please refer to the Fire alarm panel or addressable module installation instructions.
On each zone output group, the Fault '-' (negative terminal) and alarm NO terminal are connected
by a jumper on the DSCU-EN PCB. Do not remove or break this jumper when the system is used with
an EN54 fire alarm system in the wiring configuration shown.
DSCU-EN
Alarm Relay
DSCU-EN
Fault Output
ProReact
end-of-line
unit (EOLU-EN)

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Leader Cable
In certain applications it may be desirable or necessary to use non-
sensing leader cable between the ProReact DSCU-EN unit and the
Digital LHD cable. For example, if the the DSCU-EN unit is located some
distance away from the area protected by the Digital LHD cable. This
may be required if the expected ambient temperature range, or other
environmental conditions, where the Digital LHD cable is to be used is
greater than the maximum ambient temperature range for the DSCU-EN
unit. (see steps 8, 9 and 10 in the Commissioning section on pages 10-11).
The maximum length of leader cable that can be used per zone is
dependent upon the leader cable diameter’. The following is a guideline
for typical cable sizes and maximum length:
Leader Cable Size Max Leader Cable Length
20AWG
(16x0.2mm or 0.8mm dia, copper) 1000m
Mounting Dimensions
The DSCU-EN is intended to be wall-mounted. 4 holes should be drilled
according to the mounting dimensions given in gure 2. The
corresponding mounting holes on the DSCU-EN unit can be found by
removing the lid of the device. The mounting holes are located adjacent to
the lid screw positions. Suitable screws for the type of wall the DSCU-EN
is to be mounted on will need to be provided for separately. The maximum
screw head diameter is 7mm and the maximum screw thread diameter is
4mm.
Static Discharge Cautionary
The following items are cautionary notes that will help prevent
equipment damage or malfunction caused by static discharge:
CAUTION
Static charges produce voltages high enough to damage electronic
components. Follow these precautions when installing, servicing, or
operating the DSCU-EN:
• Work in a static-free area.
• Discharge any static electricity you may have accumulated.
• Discharge static electricity by touching a known, securely
grounded object.
• Do not handle the printed circuit board (PCB) without proper
protection against static discharge.
In the event that the DSCU-EN malfunctions after encountering a static
discharge correct operation of the unit can be restored by interrupting
power to unit for a brief period (approximately 10 seconds). Setup
information can be veried by following the steps in the Commissioning
section (page 10 onwards). In the event of the setup information
being corrupted the unit should be reset following the Resetting the
DSCU-EN procedure.
Figure 2: Mounting Dimensions for the Thermocable ProReact DSCU-EN
Useful Information

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1. After wiring the unit up (see wiring diagram) power up the device.
Device will show screen including software revision number.
2. If the unit is being setup for the rst time the following options will
be shown. If the unit has previously been installed the display will
automatically cycle through the options, showing the stored settings.
3. After the initial title screen the next screen will show a menu (see
right) with three options: Load Congs, New Congs and Self Test. On a
previously congured device, after 10s of no button press the device will
automatically proceed to loading saved congs.
4. If “Load Congs” is selected or no button has been pressed after 10s
on a previously congured device, the screen will show “Loading Saved
Congs”. The previously saved parameters will then be displayed.
5. Select the operating mode. (see “Operating modes” (pages 7-8)
for more detail.
Independent: the two zones operate independently of each
other (default).
Interlock: Both fault outputs activate when a fault occurs on either zone
1 or zone 2. Both alarm outputs activate only when both Digital LHD
zones trigger an alarm.
6. Select the relevant operating programme for Zone 1 based on the
table below:
7. Select the relevant operating programme for Zone 2 based on the table
below:
8. If leader cable is connected between the Digital LHD cable and the
DSCU-EN unit and/or the LHD cable is installed in a hazardous area and IS
barriers are being used, the voltage drop to the start of the LHD cable
must be measured by the DSCU-EN unit in order to ensure correct
operation and accurate distance location. In order to do this, with the
leader cable and/or IS barriers and LHD cable connected to the DSCU-EN
unit, short out the connection at the start of the LHD cable. Select “Yes”
and press Set to continue.
Commissioning
ProReact DSCU-EN
SW REV 1.6
MAIN MENU
LOAD CONFIGS
LOADING SAVED
C O N F I G S...
Z1 Cable Type:
T078-V10-A045
Z2 Cable Type:
T078-V10-A045
Operating Mode:
INDEPENDENT
Alarm (or activation)
temperature
Cable Set-Up
T078-V10-A045 T088-V10-A065
78°C (EN78) 3
88°C (EN88) 3
Alarm (or activation)
temperature
Cable Set-Up
T078-V10-A045 T088-V10-A065
78°C (EN78) 3
88°C (EN88) 3
In this example, the rst option has been chosen
for an alarm temperature of 78°C
In this example, the rst option has been chosen
for an alarm temperature of 78°C
Zone 1 ldr cable
Yes

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Commissioning (Cont.)
9. If “Yes” was selected in step 8, the DSCU-EN unit will then ask if the
zone is ready to be calibrated. Ensure that the connection between the
leader cable and/or the IS barriers and the start of the Digital LHD cable is
securely shorted out between the two cores. When this is done, press the
“Set” button to continue.
10. The DSCU-EN unit will display the voltage drop across the leader
cable. If necessary, press “Select” to perform the calibration measurement
again. The DSCU-EN unit will display the updated voltage drop in mV
(milli-volts). The displayed value should be equal to approximately the
loop resistance in ohms from the DSCU-EN unit, with the short in place,
divided by 8. Once the voltage drop has been conrmed correct, press
“Set” to continue. Now remove the short at the start of the LHD cable.
11. If the Linear Heat Detection cable is connected directly to the DSCU-
EN then select No and press the Set button to continue.
12. Select whether you would like the alarm outputs for both zones to
be latching. If set to Yes, then if an alarm is triggered the unit will either
require the power supply to be interrupted (min. 2s) or the Set button
to be pressed to reset to normal once the alarm conditioned has
been cleared.
13. Select whether the Modbus output should be enabled. If this is not
enabled then proceed to step 17.
14. Select required Modbus type, either RTU or ASCII.
15. Set the Modbus address for this device (1-247).
16. Cycle through the possible Baud Rates for the Modbus RTU/ASCII
output. (2400, 4800, 9600, 19200, 38400, 57600, 115200).
17. Select the number of data bits for the Modbus RTU/ASCII output.
(7 or 8)
18. Select the number of stop bits for the Modbus RTU/ASCII output.
(1 or 2).
19. Select the parity for the Modbus RTU/ASCII output.
(even/odd/none).
Modbus TYPE
RTU
Modbus address
1
Latching outputs
No
Modbus output on
yes
R ea dy to
ca lib r ate?
Zone 2 cal:
109 mV
ZONE 2 ldr cable
no
BAUD RATE
2400
DATA BITs
7
Stop BITs
1
PariTY
Even

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Zone 1: OK
Zone 2: OK
{Zone 1: OK
{Zone 2: OK
LED Illustration
Either of the display screens above and a single ashing Power light (green colour) should be visible
when ProReact DSCU-EN unit is in normal operation.
Independent mode
Interlock mode
Normal Operation
20. Once the unit has been commissioned, the display will show the zone
status. In normal operation, the display unit in independent mode will
show:
Zone 1: OK
Zone 2: OK
The display unit in interlock mode will show:
{Zone 1: OK
{Zone 2: OK
This indicates the two zones of LHD cable are linked and an alarm is only
transmitted if both zones are triggered.

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Zone 1: OK
Zone 2: I/F FAULT
Zone 1: FAULT
Zone 2: OK
{Zone 1: 300M
{Zone 2: OK
{Zone 1: 300M
{Zone 2: 301M
Fault/Alarm Conditions
LED Illustration
21. If an alarm condition occurs the DSCU-EN automatically calculates the
distance along the cable to the trigger point and rst displays this value
in metres.
22. The display alternates showing the distance along the cable to the
trigger point in metres and in feet.
23. The unit monitors for relay faults. If an alarm condition occurs but the
relay does not switch state (due to a coil failure for example) the device
will go into relay fault and show the screen to the right, depending upon
which zone is in fault
24. The unit monitors for interference faults when the input may be
changing between alarm, ok and fault conditions, for example, too rapidly.
In this case an I/F fault is displayed on the corresponding zone. Check all
cable teminations are securely fastened and for other sources of noise.
25. The unit monitors for cable faults (i.e. an open circuit). An open circuit
will be displayed as fault (as per zone 1 shown right).
26. In interlock mode, the alarm outputs are only activated when both
LHD cables are triggered. If one cable triggers but not the other the
display will show the distance to the alarm on the triggered zone and the
corresponding alarm LED will ash slowly.
27. In interlock mode, if both cables go into an alarm, the alarm outputs
will be activated and the display will show the distance to the alarm for
each zone. The zone 1 and zone 2 alarm LEDs will light continuously.
Zone 1: RLY FLT
Zone 2: OK
Zone 1: 1751 ft
Zone 2: OK
Zone 1: 534 m
Zone 2: OK

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Testing & Verication
1. If self test mode is selected the device will rst load the saved congs
then proceed to cycle through normal operation, alarm and fault.
This is to allow the installer/maintenance engineer verify that the unit
is corrected to an external system correctly. The screen will ash “SELF
TEST/MODE” every few seconds.
2. In self test mode the device cycles between normal operation, alarm
and fault every approx. 8 seconds. In normal operation the display will
show ok. The alarm relays will be off and the fault output normally
conducting (on).
3. In self test mode and alarm condition the display will show alarm.
The alarm relays will be on. After approx. 8 seconds the unit will go into
fault condition.
4. In self test mode and fault condition the display will show fault.
The fault outputs will stop conducting (off). After approx. 8 seconds the
unit will return to normal condition. To exit self test mode, press and hold
both SET and SELECT buttons for 10s or more until the device resets.
Zone 1: OK
Zone 2: OK
{Zone 1: OK
{Zone 2: OK
Zone 1: ALM
Zone 2: ALM
{Zone 1: ALM
{Zone 2: ALM
Zone 1: FAULT
Zone 2: FAULT
{Zone 1: FAULT
{Zone 2: FAULT
SELF TEST
MODE
LED Illustration
Independent mode
Independent mode
Independent mode
Interlock mode
Interlock mode
Interlock mode

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Two-wire RS-485 Modbus RTU/ASCII Communications
The Thermocable ProReact DSCU-EN includes a two wire RS-485 Modbus output which can be enabled to
output the status of each zone of Digital Linear Heat Detection cable. The DSCU-EN Modbus output
supports the Modbus RTU/ASCII protocol and the following functions:
• Function code 4 (Read Input Registers)
The request for reading the input registers should be constructed in the following manner:
• Address of rst register to be read (16-bit)
• Number of registers to read (16-bit)
The DSCU-EN will respond in the following manner:
• Number of bytes of register values to be read (8-bit)
• Register values (16-bits per register)
The DSCU-EN stores the information for each zone of the Digital LHD cable in the following format:
Register Description Possible Values
0 Zone 1 status -1 or 65535=fault on zone
0=zone ok
1-32767=distance in metres to trigger point
1 Zone 2 status -1 or 65535=fault on zone
0=zone ok
1-32767=distance in metres to trigger point
2 Zone 1 cable type 1 = T078-V10-A045 (EN78), 2 = T088-V10-A065 (EN88)
3 Zone 2 cable type 1 = T078-V10-A045 (EN78), 2 = T088-V10-A065 (EN88)
If the start address plus the requested number of registers exceed 4, the DSCU-EN will return an
ILLEGAL DATA ADDRESS error.
If the request contains a function code other than those supported the DSCU-EN will return an
ILLEGAL FUNCTION error.

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Resetting the ProReact DSCU-EN
WARNING: This procedure will erase ALL stored settings and reset the Thermocable ProReact
DSCU-EN unit back to its factory default state. The cable types, leader cable calibration,
latching output selection and Modbus setup will all require selecting after this procedure.
To reset the ProReact DSCU-EN unit back to the factory state, when the unit is powered up and in normal
operation (see step 20 in the Commissioning procedure), press and hold the SET and SELECT buttons for a
minimum of 10 seconds continuously. While the SET and SELECT buttons are held down the power LED will
ash quickly to conrm this procedure is about to take place. After approximately 10 seconds, the unit will
restart and return to step 1 in the Commissioning procedure. The settings are only erased if the menu option
“New Congs” is selected.

www.thermocable.com
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Thermocable (Flexible Elements) Ltd,
Pasture Lane, Bradford, BD14 6LU
United Kingdom
Glossary
Alarm condition – A re or overheat around the Digital LHD cable which activates the cable and triggers the
DSCU-EN unit.
Cable glands – Used to form a dust-proof and weatherproof seal around a cable entering the DSCU-EN unit.
Digital linear heat detection cable – a sensing cable comprised of a pair of twisted low resistance
conductors that fuse together at a specic temperature and induce an alarm on a re panel or interface
module.
End of line resistor – A component which allows a residual current ow through a circuit to monitor the
integrity of the circuit. In the event of a break in the circuit, current will stop owing completely and a
trouble or fault signal will be triggered.
Fault condition – A break in one or both cores of the Digital LHD cable or a malfunction of the DSCU-EN
unit.
Independent mode – The mode on the DSCU-EN unit where both zones operate separately. Each zone can
trigger a fault or alarm, or be in the normal state, regardless of the state of the other zone.
Interlock mode – The mode on the DSCU-EN unit where the alarm relay outputs will only activate when
both Digital LHD cables go into alarm. If one cable triggers but not the other, the alarm relay outputs will
not be triggered.
Junction box – A secure, dust-proof and weatherproof enclosure to protect a join between two lengths of
Digital LHD cable or a length of Digital LHD cable and leader cable.
Leader cable – A non-temperature sensing cable which transmits the signals between two components in
the system, e.g. the DSCU-EN unit and the Digital LHD cable. Does not provide re detection and may be
re-rated to continue functioning even in a re condition.
Two-wire RS-485 Modbus RTU/ASCII Communications – An industry standard, signalling protocol used to
communicate information between components in a system, for example a SCADA system or PLC. Often
used to provide more information to be communicated than simple open or closed status communicated
by a relay output.
Zone – a single circuit of ProReact linear heat detection cable connected across either a ProReact DSCU-EN
or a re panel and an end of line resistor