Kentec Electronics Sigma XT Plus User manual

Sigma XT+
Extinguishant Control Panel
Operation and Maintenance Manual
Man-1112 Issue 23 March 2016

Man-1112 Sigma XT+_23 Page 2 of 52
Index
Contents
Introduction.........................................................................................5
2. Safety and mounting .........................................................................6
2.1 Safety ...................................................................................................6
2.2 Mounting........................................................................................7
3. Technical specification .......................................................................8
4. Control panel fascias........................................................................ 12
4.1 Removing the fire detection equipment chassis ......................................... 13
5. Connecting to the circuit boards ........................................................ 14
6. Detection zone wiring ...................................................................... 17
7. Sounder circuit wiring (alarm devices as required by EN12094-1) .......... 17
8. Using intrinsically safe barriers.......................................................... 18
9. Connection to monitored inputs......................................................... 19
10. Connection to extinguishant output.................................................. 19
10.1 Solenoid wiring ................................................................................... 19
10.2 Igniting actuator wiring........................................................................ 20
10.3 Setting up extinguishant monitoring circuit ............................................. 20
11. Connection to remote control terminals ............................................ 21
12. Aux 24V DC supply outputs (extinguishant modules only) ................... 21
13. Connection to relay contacts ........................................................... 22
13.1 Common Fault relay (on detection part of control panel)........................... 22
13.2 Fault relay (on extinguishing part of control panel)................................... 22
13.2 Local fire relay (on detection part of control panel)................................... 22
13.3 Fire relay (on detection part of control panel).......................................... 22
13.4 1st stage alarm relay (on extinguishing modules) ..................................... 22
13.5 2nd stage alarm relay (on extinguishing modules) ................................... 22
13.6 Released relay (on extinguishing modules).............................................. 22
13.7 Aborted relay (on extinguishing modules)............................................... 22
13.8 Extract relay (on extinguishing modules) ................................................ 22
14. Connection and configuration of status units and ancillary boards......... 23
14.1 Adding new status units/ancillary boards ................................................ 24
14.2 Removing status units or ancillary boards ............................................... 24
15. Configuring the panel..................................................................... 27
15.1 Detection part..................................................................................... 27
15.2 Extinguishing modules ......................................................................... 29
15.2.1 Language selection .................................................................................... 29
15.2.2 Extinguishant output mode ......................................................................... 29
15.2.3 Configuring the activation mode .................................................................. 30
15.2.5 Configuring the activation zones .................................................................. 30
15.2.6 Reset inhibit time ...................................................................................... 31
15.2.7 Pre-release delay time................................................................................ 31
15.2.8 Output 2 delay.......................................................................................... 31
15.2.9 Extinguishant release time.......................................................................... 31
15.2.10 Second stage alarm pulsing/continuous (alarm devices as required by EN12094-1)
........................................................................................................................ 32
15.2.11 Released indication .................................................................................. 32

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15.2.12 Delay on manual release........................................................................... 32
15.2.13 Release timer (infinite extinguishant duration) ............................................. 32
15.2.14 R0V not removed on reset......................................................................... 33
15.2.15Disable earth fault monitoring..................................................................... 33
15.2.16 Disable fault output.................................................................................. 33
15.2.17 Invert low pressure switch input ................................................................ 34
15.2.18 Invert Released Pressure switch input......................................................... 34
15.2.19Extinguishant output monitoring levels ........................................................ 34
16. Panel operation – Access levels 1 and 2............................................ 35
16.1 Normal condition................................................................................. 35
16.2 Detection section – Access level 2.......................................................... 35
16.2.1 Test mode................................................................................................ 35
16.2.2 Disable zones............................................................................................ 35
16.2.3 Disable sounder outputs............................................................................. 35
16.2.4 Activate delays.......................................................................................... 36
16.3 Extinguishant modules – Access level 2........................................................... 36
16.3.1 Disable extinguishant release outputs........................................................... 36
16.3.2 Disable Manual release............................................................................... 36
16.3.3 Disable Stage 1 output............................................................................... 36
16.3.4 Disable Stage 2 output............................................................................... 37
16.3.5 Disable Released output ............................................................................. 37
16.3.6 Disable Extract output................................................................................ 37
16.3.7 Turn on Extract output ............................................................................... 37
16.3.8 Select Reserve Solenoid Output (Configuration Option)................................... 37
16.4 Single zone Fire condition.................................................................... 38
16.5 Double zone Fire condition.................................................................... 38
16.6 Silence/sound alarms........................................................................... 38
16.7 Reset................................................................................................. 38
16.8 Detection Zone fault ............................................................................ 38
16.9 Sounder fault...................................................................................... 38
16.10 Power fault....................................................................................... 38
16.11 System fault – Detection section.......................................................... 38
16.12 System fault – Extinguishant modules .................................................. 39
16.13 General fault – Detection section ......................................................... 39
16.14 Lamp test......................................................................................... 39
16.15 Hold condition................................................................................... 39
16.16 Released condition............................................................................. 39
16.17 Low pressure switch........................................................................... 39
16.18 Manual only mode ............................................................................. 39
17. Internal Controls ........................................................................... 40
17.1 Detection part..................................................................................... 40
17.1.1 Watchdog reset......................................................................................... 40
17.1.2 Processor reset ......................................................................................... 40
17.1.3 Write enable switch.................................................................................... 40
17.2 Extinguishant modules......................................................................... 40
17.2.1 Watchdog reset......................................................................................... 40
17.2.2 Processor reset ......................................................................................... 40
17.2.3 Terminate extinguishant............................................................................. 40
17.2.4 Write enable switch.................................................................................... 40
17.2.5 Address switch.......................................................................................... 41
18. Internal indications........................................................................ 41
18.1 Detection part..................................................................................... 41
18.1.1 Mains fail.................................................................................................. 41
18.1.2 Batt fail.................................................................................................... 41
18.1.3 CPU fault.................................................................................................. 41

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18.1.4 Aux 24V fault............................................................................................ 41
18.1.5 Batt low ................................................................................................... 41
18.1.6 Comms fault............................................................................................. 42
18.1.7 Earth fault................................................................................................ 42
18.1.8 Sys fuse fault............................................................................................ 42
18.1.9 S1 fault.................................................................................................... 42
18.1.10 S2 fault.................................................................................................. 42
18.2 Extinguishant modules......................................................................... 42
18.2.1 Watchdog................................................................................................. 42
18.2.2 System fuse ............................................................................................. 42
18.2.3 Man. Release ............................................................................................ 42
19. Power supply ................................................................................ 43
21. Maintenance ................................................................................. 45
23. CE Mark....................................................................................... 46
24. Commissioning instructions............................................................. 47

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Introduction
The SIGMA XT+ range of control panels are designed in accordance with European standards EN54-2 and EN54-4
Fire Detection and Fire Alarm systems - Control and Indicating Equipment and EN12094-1 Fixed firefighting systems
- Components for gas extinguishing systems - Part 1: Requirements and test methods for electrical automatic control
and delay devices.
The control equipment is a combined fire alarm control panel and extinguishing system with up to eight detection
zones, and up to four extinguishant flooding areas.
Control panels have an integral, mains powered battery charger and power supply designed in accordance with the
requirements of EN54-4.
In addition to the requirements of EN54-2 the control panel has the following facilities:
Test condition to allow the automatic resetting of zones in alarm for testing purposes. EN54-2 Section 10: option
with requirements.
Delay of the actioning of fire alarm devices (sounders) so that an alarm may be verified before a premises is
evacuated. EN54-2 Section 7.11: (option with requirements).
Fire alarm devices to enable an audible warning to be sounded throughout premises upon the detection of a fire
condition or the operation of a manual call point. EN54-2 Section 7.8: (option with requirements).
In addition to the requirements of EN54-2, all control panels have voltage free relay contacts for fire and local fire
which operate upon a fire condition. These are to be used for local control and signalling.
The following compulsory functions required by EN12094-1 are included:
4.3.2a Reception and processing of at least one input triggering signal from an f.d.a.s and an input triggering signal
from manual triggering device(s) connected directly to the e.c.d.
4.3.2b Transmission of the extinguishing signal upon receipt of input triggering signal(s).
4.3.2c Activation of alarm devices upon receipt of input triggering signal(s).
4.2.2d Unambiguous indication of each condition.
4.2.3e Transmission of the information of the incorrect ststus of components and of the fault warning condition.
4.3.2f Transmission of the information of the released condition.
In addition to the compulsory requirements of EN12094-1 the control panel has the following facilities:
Delay of extinguishing signal of up to 60 seconds. EN12094-1 Section 4.17: (option with requirements).
Signal representing the flow of extinguishing agent to indicate the released condition. EN12094-1 Section 4.18:
(option with requirements).
Monitoring of the status of components by way of a low pressure switch input. EN12094-1 Section 4.19 : (option with
requirements).
Emergency hold device to enable the extinguishant delay time to be extended. EN12094-1 Section 4.20: (option with
requirements).
Control of flooding time to deactivate the releasing output after a set period of time. EN12094-1 Section 4.21: option
with requirements.
Manual only mode to disable the release of extinguishant via automatic detection devices. EN12094-1 Section 4.23:
(option with requirements).
Triggering of equipment outside the system by way of first and second stage contacts, extract fan output etc.
EN12094-1 Section 4.26: (option with requirements).
Activation of alarm devices with different signals to indicate pre- discharge and released warnings using different
sounds. EN12094-1 Section 4.30: (option with requirements).
Emergency Abort device to inhibit the extinguishing signal until the emergency abort device has been de-activated
and the panel has been reset. EN12094-1 Section 4.27: (option with requirements).
Extinguishing signals to spare cylinders. EN12094-1 section 4.25 (option with requirements)

Man-1112 Sigma XT+_23 Page 6 of 52
2. Safety and mounting
2.1 Safety
Suppliers of articles for use at work are required under section 6 of the Health and Safety at Work act 1974 to ensure
as reasonably as is practical that the article will be safe and without risk to health when properly used.
An article is not regarded as properly used if it is used ‘without regard to any relevant information or advice’ relating
to its use made available by the supplier.
This product should be installed, commissioned and maintained by trained service personnel in accordance with the
following:
(i) IEE regulations for electrical equipment in buildings
(ii) Codes of practice
(iii) Statutory requirements
(iv) Any instructions specifically advised by the manufacturer
According to the provisions of the Act you are therefore requested to take such steps as are necessary to ensure that
you make any appropriate information about this product available to anyone concerned with its use.
This equipment is designed to operate from 230V 50Hz mains supplies and is of class 1 construction. As such it
must be connected to a protective earthing conductor in the fixed wiring of the installation and a readily accessible
double pole disconnect device meeting the requirements of EN60950/IEC950 which disconnects live and neutral
simultaneously shall be incorporated in the fixed wiring.
Switch disconnect devices such as MK Sentry 63A or similar are suitable for this.
Failure to ensure that all conductive accessible parts of this equipment are adequately bonded to the
protective earth will render the equipment unsafe.
This control panel is environmental class A and is designed for indoor use only at temperatures between -50C (+/- 3)
and +400C (+/- 2) and with a maximum relative humidity of 95%.
The IP rating for the enclosure is IP30.
Operation outside of these limits may render the equipment unsafe.

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2.2 Mounting
The control panel should be mounted on a dry, flat surface, at eye height to the displays and in a level position such
that the enclosure is not distorted.
Screws or bolts of a minimum of 5mm diameter must be used to mount the enclosure in all four mounting positions.
It should be positioned in an accessible place as agreed with the end user.
Suitable fixings should be used at all fixing points such that the control panel is securely mounted and is not liable to
move once fixed.
The control panel should not be mounted in another enclosure or near sources of excessive heat.
Cables should be connected using suitable cable glands fitted to the knockouts provided. If additional cable entry
points are required, all swarf and debris caused by drilling of additional cable entries must be cleared before power is
applied to the panel.
Cables should not be installed in the bottom of the enclosure. This space must be kept free for batteries.

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3. Technical specification
Table 1 - Electrical specifications
ITEM ELECTRICAL RATING COMMENT COMMUNICATION
PARAMETERS
Mains supply 230V AC, 50Hz +10% - 15% (100 Watts maximum) Standard European mains
connection
Mains supply fuse (K21021,
K21041, K21042, K21081,
K21082)
1.6 Amp ( F1.6A L250V) Replace only with similar type
Mains supply fuse (K21083,
K21084) F3A 250V TD 20mm Replace only with similar type
Power supply rating (K21021,
K21041, K21042, K21081,
K21082)
3 Amps when battery charging is not required See section 19 for maximum loading for
each model
Power supply rating (K21083,
K21084) 5 Amps when battery charging is not required See section 19 for maximum loading for each model
Maximum ripple current 1 Volt
Power supply output voltage 19 to 30V DC
Battery type (Yuasa NP) 2 x 12 Volt sealed lead acid in series
Battery charge voltage 27.6VDC nominal (temperature compensated) See chart below Modulated DC
Battery charge current 0.7A maximum - (K21021, K21041, K21042, K21081, K21082)
1,25A maximum - (K21083, K21084) Modulated DC
Imax a 0.85A - K21021, K21041, K21042, K21081, K21082
4A - K21083, K21084
Imax b 3A - K21021, K21041, K21042, K21081, K21082
5A - K21083, K21084
Ri max 1.35R - K21021, K21041, K21042, K21081, K21082
1R - K21083, K21084
Battery fuse 20mm, 3.15A glass (K21021, K21041, K21042, K21081,
K21082) models only. Replace only with the same type
Current draw in mains fail
condition K21021- 119 milliamps quiescent – 207 milliamps full alarm K21041 – 130 milliamps quiescent – 317 milliamps full alarm
K21042 – 185 milliamps quiescent – 424 milliamps full alarm
K21081 – 150 milliamps quiescent – 657 milliamps full alarm
K21082 – 200 milliamps quiescent – 764 milliamps full alarm
K21083 – 255 milliamps quiescent – 871 milliamps full alarm
K21084 – 300 milliamps quiescent – 978 milliamps full alarm
Full alarm current consumption figure is
with all zones in alarm and all modules
activated.
Maximum current draw from
batteries 3 Amps (K21021, K21041, K21042, K21081, K21082) 7 Amps (K21083, K21084) With main power source disconnected
Aux 24V output (Exting modules) Fused at 500mA with electronic fuse – 1 per extinguishant area 200 milliamp maximum continuous load 19 to 30 VDC
Aux 24V output (detection
module) Fused at 500mA with electronic fuse 200 milliamp maximum continuous load 19 to 30V DC
1st and 2nd stage Sounder outputs 18 to 30V DC Fused at 1A with electronic fuse 1.0 Amp total load over all circuits Voltage reversing DC
Fault relay contact rating 5 to 30VDC 1A Amp maximum for each Maximum ratings not to be exceeded Volt free changeover contact
Fire relay contact rating 5 to 30VDC 1A Amp maximum for each Maximum ratings not to be exceeded Volt free changeover contact

Man-1112 Sigma XT+_23 Page 9 of 52
Local fire relay contact rating 5 to 30VDC 1A Amp maximum for each Maximum ratings not to be exceeded Volt free changeover contact
First stage contact rating 5 to 30VDC 1A Amp maximum for each Maximum ratings not to be exceeded Volt free changeover contact
Second stage contact rating 5 to 30VDC 1A Amp maximum for each Maximum ratings not to be exceeded Volt free changeover contact
Extract contact rating 5 to 30VDC 1A Amp maximum for each Maximum ratings not to be exceeded Volt free changeover contact
Zone quiescent current 0mA minimum, 2mA maximum See tables 2 and 3 for detector types
Terminal capacity 0.5mm2to 2.5mm2 solid or stranded wire
Number of detectors per zone Dependent on type See table 2
Number of sounders per circuit Dependent on type and current consumption See table 4 for sounder types
Detection circuit end of line 6K8 +/- 5% ½ Watt resistor Supplied in terminals
Monitored input end of line 6K8 +/- 5% ½ Watt resistor Supplied in terminals
Sounder circuit end of line 10K +/- 5% ¼ Watt resistor Supplied in terminals
Extinguishant output end of line 1N4004 Diode Supplied in terminals
No. of detection circuits Two to eight. 21 VDC Dependent on model
No. of sounder circuits Dependent on model 18 to 30V DC 2 x on detection section –1st stage and
1 x 2nd stage per exting area. 2nd stage sounders are outputs to alarm devices as required by
EN12094-1
Extinguishant release output 18 to 30V DC. Fused at 1 Amp 1 Amp maximum load –for 5 minutes
3 Amps for 20 milliseconds Voltage reversing DC with calibration facility
Extinguishant release delay Adjustable 0 to 60 seconds (+/- 10%) 5 second steps
Extinguishant release duration Adjustable 60 to 300 seconds 5 second steps
SIL, AL, FLT, RST inputs Switched -ve, min resistance 0 ohms, max resistance 100
Ohms Only to be used with Aux ROV terminal Switched DC
Zone normal threshold (Allowable
EOL) 8K ohm to 1K ohm Use 6K8 end of line resistor
Detector alarm threshold 999 ohms to 400 ohms Nominal trigger resistance 470 ohms
Call point alarm threshold 399 ohms to 100 ohms Nominal trigger resistance 270 ohms
Short circuit threshold 99 ohms to 0 ohms
Head removal condition 15.5 to 17.5 volts 2-wire detector base or schottky diode
base
Cabling FP200 or equivalent (maximum capacitance 1uF max
inductance 1 mH Metal cable glands must be used
Monitored inputs normal threshold
(Allowable EOL) 10K ohm to 2K ohm
Monitored inputs alarm threshold 2K ohms to 150 ohms +/- 5%
Monitored inputs Short circuit
threshold 140 ohms to 0 ohms +/- 5%
Status unit/Ancillary board
connection Two wire RS485 connection (EIA-485 specification) Maximum of 7 units per area- RS485 data cable.
Compatible status units - K911000M8,
K911000F8, K911100M8, K911100F8,
K911110M8, K911110F8, W911000W8,
W911100W8, W911110W8
(EIA-485 specification)
Status unit power output 18 to 30V DC, Fused at 500mA with electronic fuse 250 milliamp maximum load Max 3 per module – More status
units must be supplied with
external power supply

Man-1112 Sigma XT+_23 Page 10 of 52
Table 2 - Compatible detectors
Model Type Manufacturer Maximum Number per zone
SLR-E/SLR-E3 OPTICAL Hochiki 32
SIJ-E/ IONISATION Hochiki 32
DCD-1E/DCD-AE3 HEAT Hochiki 32
DCD-2E HEAT Hochiki 32
DCD-1RE/DCD-CE3 HEAT Hochiki 32
DFG-60E HEAT Hochiki 32
DFJ-60E/DFJAE3 HEAT Hochiki 32
DFJ90-E/DFJCE3 HEAT Hochiki 32
SPB-ET BEAM Hochiki 8
SRA-ET BEAM Hochiki 5
55000-200/210 - SERIES 60 IONISATION Apollo 32
55000-300 - SERIES 60 OPTICAL Apollo 32
55000-100 - SERIES 60 HEAT Apollo 32
55000-101 - SERIES 60 HEAT Apollo 32
55000-102 - SERIES 60 HEAT Apollo 32
55000-103 - SERIES 60 HEAT Apollo 32
55000-104 - SERIES 60 HEAT Apollo 32
55000-215 -SERIES 65 IONISATION Apollo 32
55000-216 - SERIES 65 IONISATION Apollo 32
55000-217 - SERIES 65 IONISATION Apollo 32
55000-218 - SERIES 65 IONISATION Apollo 32
55000-219 - SERIES 65 IONISATION Apollo 32
55000-220 - SERIES 65 IONISATION Apollo 32
55000-315 - SERIES 65 OPTICAL Apollo 32
55000-316 - SERIES 65 OPTICAL Apollo 32
55000-317 - SERIES 65 OPTICAL Apollo 32
55000-120 - SERIES 65 HEAT Apollo 32
55000-121 - SERIES 65 HEAT Apollo 32
55000-122 - SERIES 65 HEAT Apollo 32
53541-151 - SERIES 30 IONISATION Apollo 32
53541-152 - SERIES 30 IONISATION Apollo 32
53551-101 - SERIES 30 OPTICAL Apollo 32
53531-221 - SERIES 30 HEAT Apollo 28
53531-211 - SERIES 30 HEAT Apollo 28
53531-212 - SERIES 30 HEAT Apollo 28
53531-213 - SERIES 30 HEAT Apollo 28
53531-214 - SERIES 30 HEAT Apollo 28
ORB-OP-12001-APO Optical Apollo 15
ORB-OH-13001-APO Multisensor Apollo 15
ORB-HT-11001-APO A1R Heat Apollo 15
ORB-HT-11002-APO A2S Heat Apollo 15
ORB-HT-11003-APO BR Heat Apollo 15
ORB-HT-11004-APO BS Heat Apollo 15
ORB-HT-11005-APO CR Heat Apollo 15
ORB-HT-11006-APO CS Heat Apollo 15
NID-58 IONISATION Nittan 32
2KC/2KD OPTICAL Nittan 32
2SA-LS/2SA-70T-LS HEAT Nittan 32
TCA-70-LS HEAT Nittan 32
NFD-18-2/NFD-18-5 FLAME Nittan 3
NID-48F IONISATION Nittan 32
NS-12-7 HEAT Nittan 32
NC-9C-70T HEAT Nittan 32
ECO1002 HEAT/PHOTO System Sensor 21
ECO1003 PHOTO System Sensor 26
ECO1005 HEAT System Sensor 22
ECO1005T HEAT System Sensor 22
Although the current consumption of many detection devices would allow more than 32 to be connected to a zone,
this number should be limited to 32 to ensure that a short or open circuit on the wiring does not prevent the
indication of a fire alarm from more than 32 fire detectors and/or call points as required by European standard
EN54-2. If an active end of line LCMU (K14060) is used fit a maximum of 20 detectors per zone.

Man-1112 Sigma XT+_23 Page 11 of 52
Table 3 - Compatible detector bases and call points
Model Type Manufacturer Comments
YBN-R/6 STANDARD WITH REMOTE LED Hochiki
YBO-R/4(IS) STANDARD WITH REMOTE LED (I.S.) Hochiki
YBN-R/6SK DIODE BASE Hochiki Must be used with
LCMU
YBO-R/6R STANDARD LATCHING RELAY Hochiki
YBO-R/6RN STANDARD NON-LATCHING RELAY Hochiki
YBO-R/6RS DIODE BASE WITH LATCHING RELAY Hochiki Must be used with
LCMU
ECO1000R STANDARD System Sensor
ECO1000BRSD DIODE BASE System Sensor Must be used with
LCMU
456821-200 STANDARD BASE Apollo
456821-201 DIODE BASE Apollo Must be used with
LCMU
ORB-MB-00001-APO Timesaver Base Apollo
ORB-DB-00003-APO Timesaver Diode Base Apollo
ORB-RB-10004-APO Timesaver Relay Base Apollo
MCP1 470 OHM CALL POINT KAC
CX 470 OHM CALL POINT Fulleon
NCP-T CALL POINT Nittan
ELECTRONICS FREE BASES ALL
Note: LCMU (Line Continuity Monitoring Device) part number K14060 allows call points mounted down line of
detectors that have been removed from diode bases to continue to operate.
Table 4 - Compatible sounders
Model Type Manufacturer Comments
BANSHEE ELECTRONIC VIMPEX
WAFER ELECTRONIC VIMPEX
FIRECRYER RANGE ELECTRONIC VOICE VIMPEX
KOBELL MOTORISED VIMPEX
ASKARI ELECTRONIC FULLEON
ROSHNI ELECTRONIC FULLEON
SQUASHNI ELECTRONIC FULLEON
SYMPHONI ELECTRONIC FULLEON
ELECTRONIC BELL ELECTRONIC FULLEON
CFB BELLS MOTORISED FULLEON
B6 AND B8 BELLS SOLENOID FULLEON
Table 5 - Compatible I.S. barriers
Model Type Manufacturer
MTL5061 DETECTION ZONE GALVANIC ISOLATOR MTL
MTL7778ac ALL SOUNDER CIRCUITS MTL
Note: Use galvanic isolator with Hochiki or Apollo detectors only

Man-1112 Sigma XT+_23 Page 12 of 52
4. Control panel fascias
This drawing shows the fascias of the models available in the Sigma XT+ range.
The fascias are divided into sections for the detection panel and extinguishant modules. A standard EN54-2 control
and indicating equipment section with up to eight zones is located in the top aperture of the panel fascia and
EN12094-1 extinguishant modules are fitted in the lower apertures.
K21021M3
K21041M3
K21042M3
K21081M3
K21082M3
K21083M4
K21084M4

Man-1112 Sigma XT+_23 Page 13 of 52
4.1 Removing the fire detection equipment chassis
Open the control panel lid using the two 801 lock keys.
Before the chassis can be removed it will be necessary to disconnect the power connector terminal block on the
left hand side of the PCB. This is fitted on pins and can be pulled towards you to remove it. Do not remove the
wires from the terminals.
The chassis is held in place by two screws. Undo the two screws and lift the chassis gently away from the box
towards you.
With the chassis removed, there is much more room inside the panel for making off and dressing cables.
When cabling work is complete, the chassis can be re-fitted with the two screws and the terminal block plugged
back onto the pins on the board.
The extinguishant module chassis should not be removed.

Man-1112 Sigma XT+_23 Page 14 of 52
5. Connecting to the circuit boards
All connections for field wiring are to rows of terminals along the top and bottom of the circuit boards.
Shielded fire alarm cable such as FP200 and metal cable glands must be used for all connections to the panel.
The shield of the cable must be bonded securely to the enclosure earth via a metal cable gland.
The resistance of any core of any cable must not exceed 25 ohms. The shield of the cable must be bonded
securely to the enclosure via the metal gland.
Wiring should enter the enclosure at the top or back of the panel using the knockouts provided and be formed
tidily to the appropriate terminals ensuring that no cables are run close (minimum 50mm) to the surface of any of
the circuit boards.
Route mains cables away from all other cables and segregate by 50mm.
Terminals are capable of accepting wires of up to 2.5mm2.
Wiring must not go across the front of the circuit boards. If cable entries need to be in positions other than at the
knockouts provided, wiring must be fed behind and well away from the surface of the circuit board.
The space at the bottom of the enclosure is largely occupied by the standby batteries so this must be borne in
mind when considering cable entries.

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Detection panel terminals

Man-1112 Sigma XT+_23 Page 16 of 52
Extinguishing module terminals

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6. Detection zone wiring
The detection zones provide a nominal 20V DC to power conventional detectors and call points as listed in the
compatibility tables 2 and 3.
The wiring is monitored for open and short circuit fault conditions by removing the 6K8 0.5W end of line
monitoring resistors that are supplied fitted to the control panels’ terminals and placing them across the last
device that is wired to the zone circuit.
Detection zone circuits must be wired as a single, radial circuit with no spurs or T junctions to enable the
monitoring circuit to work correctly.
For systems that are required to comply with BS5839 Part1:2002 detector removal requirements, either detector
bases fitted with a Schottky diode should be used and the end of line resistor replaced with an LCMU active end of
line monitoring device or zener clamping bases such as Hochiki PA6 or Apollo Savwire used.
7. Sounder circuit wiring (alarm devices as required by EN12094-1)
All sounders must be of the polarised type. If non-polarised sounders are used the control panel will permanently
show a fault condition. See table 4 for a list of compatible sounder types.
Sounder circuits are monitored for open and short circuit faults by placing a 10K 0.25W end of line monitoring
resistor across the last device on the circuit.
Sounder circuits must be wired as a single, radial circuit with no spurs or T junctions to enable the monitoring
circuit to work correctly.

Man-1112 Sigma XT+_23 Page 18 of 52
8. Using intrinsically safe barriers
SIGMA XT+ control panels support the use of I.S. barriers for connecting to equipment in hazardous areas.
Only certified detectors, call points and sounders may be used in hazardous areas and these must be
connected to the control panel via a compatible I.S. barrier as listed in table 5.
Connection of the I.S. barrier changes the characteristics of the detection circuit so zones that have I.S. barriers
connected must be adjusted to work with them.
Programmable options C61 to C68 on the detection section allow each zone to operate with I.S. barriers.
The amount of detectors and call points that can be connected to a zone is limited by the I.S. approval system
diagram which should be supplied by the detector manufacturer. The power rating of the end of line resistor will
be dependent upon the Zone classification rating (Gas class) this will be specified on the system diagram.
DETECTION
ZONE
TERMINALS
+ IN
-IN
+ OUT
-OUT
I.S.
DETECTOR
I.S. CALL
POINT
See manufacturers
details for detailed
connection information
See manufacturers
details for detailed
connection information
6K8 end of
line resistor
1
2
3
4
5
67
8
9
10
11
12
DETECTION
ZONE
TERMINALS
+ IN
-IN
+ OUT
-OUT
I.S.
DETECTOR
I.S. CALL
POINT
See manufacturers
details for detailed
connection information
See manufacturers
details for detailed
connection information
6K8 end of
line resistor
MTL5061 GALVANIC
ISOLATOR
SAFE AREA HAZARDOUS AREA
Detection zone wiring through an MTL5061 galvanic isolator
Sounder circuit wiring through an MTL7778ac I.S. barrier

Man-1112 Sigma XT+_23 Page 19 of 52
9. Connection to monitored inputs
Monitored inputs (Mode select, manual release, Hold, Abort, Released pressure switch and Low pressure switch)
have the same characteristics as detection zone inputs and require a 6K8 0.5W end of line monitoring resistor and
a nominal, 470 ohm 1 W trigger resistor.
Example of wiring to a monitored input
10. Connection to extinguishant output
The extinguishant output is capable of supplying up to 1 Amp for the maximum duration to a solenoid or 3 Amps
for 20 milliseconds to an igniting actuator or Metron.
The wiring for solenoids and igniting actuators is different as shown below. Igniting actuators of different types or
from different manufacturers should not be mixed on the same circuit.
10.1 Solenoid wiring
Solenoids must have a resistance of greater than 28 ohms to ensure that the maximum current rating of the
extinguishant output is not exceeded.
Solenoids should be fitted with a suppression diode to prevent EMF generated by the solenoid when it de-
energises from upsetting the operation of the control panel.
Only polarised solenoids (i.e. solenoids fitted with an internal polarising diode) should be used.
+
-
DIODE 1N 4004
BAND END TO +
Example of wiring a solenoid

Man-1112 Sigma XT+_23 Page 20 of 52
10.2 Igniting actuator wiring
A maximum of four igniting actuators can be wired in series. If only one or two actuators are fitted, a 2R2, 2.5
Watt resistor must be wired in series with them to provide the correct monitoring resistance. The end of line diode
can be discarded when igniting actuators are used.
To guarantee firing under all conditions, the total resistance of actuators, monitoring resistor and cable should not
exceed 7 ohms.
10.3 Setting up extinguishant monitoring circuit
The extinguishing output circuit is factory set to monitor the end of line diode that is fitted to the terminals and
will normally show a value of around 270.
If the parameters of the extinguishant output change e.g. by connecting a solenoid in parallel with the monitoring
diode or removing the diode and fitting igniting actuators, then the extinguishing output monitoring level will need
to be “learnt”. See section 15.2 for details. To do this, operate the enable controls keyswitch to put the system
into access level 2.
The LCD will show:
Access level 2 ►
ENTER for Menu
Operate the WRITE ENABLE switch by gently sliding it to the left. The LCD will show:
AL3 Updates = xx
ENTER for Menu
Press the ENTER button and then the UP button repeatedly until the LCD displays:
Exting. O/P 1
Level = XXX
The XXX displayed here is the previous (factory) level to which the monitoring level had been set.
Press the ENTER button. The LCD will now show:
Exting. O/P 1
Level = XXX ?
The XXX shown here is the current monitoring level detected on the extinguishing output. Press the ENTER button
to learn the new monitoring level.
Press the UP button to set the monitoring level for output 2 in the same way if it is being used, otherwise switch
the write enable slide switch to the right (off) position and check that an open or short circuit fault on the
extinguishing output(s) is detected and shown on the control panel.
+
-
MMM
3 OR 4 ACTUATORS
WIRED IN SERIES
(MAXIMUM OF 4)
EXTING
1 OR 2 ACTUATORS
WIRED IN SERIES
+
-
EXTING
M
M M FIT 2R2 2.5W RESISTOR
IN SERIES WITH
ACTUATORS IF ONLY 1 OR
2 ACTUATORS ARE USED