Kentec Electronics Sigma XT K11031F2 User manual

Sigma XT
Extinguishant Control Panel
(K11031M2, K11031F2)
Operation and Maintenance Manual
Man-1088 Issue 26 February 2015

Product Manuals/Man-1088_Sigma XT_26 Page 2 of 40
Index Page
1. Introduction.................................................................................................................................. 4
2. Safety and mounting.................................................................................................................... 5
2.1 Safety.............................................................................................................................5
2.2 Mounting.........................................................................................................................6
3. Technical specification................................................................................................................. 7
4. Control panel fascia................................................................................................................... 10
5. Connecting to the circuit board.................................................................................................. 12
6. Detection zone wiring................................................................................................................. 13
7. Sounder circuit wiring................................................................................................................. 13
8. Using intrinsically safe barriers .................................................................................................. 14
9. Connection to monitored inputs ................................................................................................. 15
10. Connection to extinguishant output.......................................................................................... 15
10.1 Solenoid wiring............................................................................................................. 15
10.2 Igniting actuator wiring..................................................................................................16
10.3 Setting up extinguishant monitoring circuit....................................................................... 16
Adjustment......................................................................................................................... 16
For 3 or more actuators ........................................................................................................ 17
For 1 or 2 actuators.............................................................................................................. 17
11. Connection to remote control terminals................................................................................... 18
12. Aux 24V DC supply.................................................................................................................. 18
13. Connection to relay contacts.................................................................................................... 19
13.1 Fault relay ................................................................................................................... 19
13.2 Local fire relay.............................................................................................................. 19
13.3 Fire relay..................................................................................................................... 19
13.4 1st stage alarm ............................................................................................................. 19
13.5 2nd stage alarm ............................................................................................................ 19
13.6 Extract relay ................................................................................................................ 19
14. Connection and configuration of status units and ancillary boards.......................................... 20
14.1 Adding new status units/ancillary boards.......................................................................... 20
14.2 Removing status units/ancillary boards ............................................................................ 21
15. Panel operation........................................................................................................................ 21
15.1 Normal condition .......................................................................................................... 21
15.2 Single zone Fire condition .............................................................................................. 21
15.3 Double zone Fire condition ............................................................................................. 22
15.4 Manual Release ............................................................................................................ 22
15.5 Silence/sound alarms ....................................................................................................22
15.6 Reset.......................................................................................................................... 22
15.7 Zone fault.................................................................................................................... 22
15.8 Sounder fault ............................................................................................................... 22
15.9 Power fault .................................................................................................................. 22
15.10 System fault............................................................................................................... 23
15.11 General fault .............................................................................................................. 23
15.12 Lamp test .................................................................................................................. 23
15.13 Hold condition ............................................................................................................ 23
15.14 Released condition ......................................................................................................23
15.15 Low pressure switch ....................................................................................................23
15.16 Test mode.................................................................................................................. 23
15.17 Change mode.............................................................................................................24
15.18 Extract fan................................................................................................................. 24
15.19 Disablements ............................................................................................................. 24
15.20.1 Disable zones...........................................................................................................................24
15.20.2 Disable sounders......................................................................................................................24
15.20.3 Activate delays.........................................................................................................................24
15.20.4 Disable fault contact .................................................................................................................24
15.20.5 Disable extinguishant subsystem................................................................................................24
15.20.6 Disable 1st stage contact ...........................................................................................................24
15.20.7 Disable 2nd stage contact...........................................................................................................24

Product Manuals/Man-1088_Sigma XT_26 Page 3 of 40
15.20.8 Disable manual release .............................................................................................................25
15.20.9 Disable extract fan ...................................................................................................................25
16. Access level 2 configuration options........................................................................................ 25
16.1 [ t1 - 3] Test zone ........................................................................................................ 25
16.2 [d1 – 3] Disable zone....................................................................................................25
16.3 [db] Disable first stage sounders..................................................................................... 25
16.4 [dP] Disable (pre-activated) first stage relay contact.......................................................... 26
16.5 [dA] Disable (activated) second stage relay contact ........................................................... 26
16.6 [dc] Disable extract fan relay.......................................................................................... 26
16.7 [dt] Disable manual triggering device (manual release)...................................................... 26
16.8 [dE] Disable extinguishant release................................................................................... 26
16.9 [Ad] Activate delays...................................................................................................... 26
16.10 [Ac] Operate extract fan output..................................................................................... 26
17. Access level 3 configuration options........................................................................................ 27
18. Internal Controls....................................................................................................................... 30
18.1 Watchdog reset ............................................................................................................ 30
18.1 Processor reset............................................................................................................. 30
18.3 Terminate extinguishant ................................................................................................ 30
18.4 Commissioning............................................................................................................. 30
19. Internal indications – troubleshooting................................................................................ 31
19.1 Mains fail..................................................................................................................... 31
19.2 Batt fail....................................................................................................................... 31
19.3 CPU fault..................................................................................................................... 31
19.4 Aux 24V fault............................................................................................................... 31
19.5 Batt low ...................................................................................................................... 31
19.6 Comms fault ................................................................................................................ 31
19.7 Earth fault ................................................................................................................... 32
19.8 Sys fuse fault............................................................................................................... 32
19.9 S1, S2 and S3 fault....................................................................................................... 32
19.10 Exting fault ................................................................................................................ 32
19.11 Hold fault................................................................................................................... 32
19.12 Manual release fault .................................................................................................... 32
19.13 Mode fault.................................................................................................................. 32
19.14 Release fault .............................................................................................................. 32
19.15 Low pres fault............................................................................................................. 32
19.16 Tell tale ..................................................................................................................... 33
20. Power supply ........................................................................................................................... 34
21. Maintenance ............................................................................................................................ 35
22. Record of configuration............................................................................................................ 35
23. CE Mark................................................................................................................................... 39
24. Commissioning instructions..................................................................................................... 40
24.2................................................................................................................................... 40
24.3................................................................................................................................... 40
24.4................................................................................................................................... 40
24.5................................................................................................................................... 40
24.6................................................................................................................................... 40

Product Manuals/Man-1088_Sigma XT_26 Page 4 of 40
1. Introduction
The SIGMA XT control panel is 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 and has
three detection zones, any or all of which are capable of contributing to the extinguishant release
decision.
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.
In addition to the 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.

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.

Product Manuals/Man-1088_Sigma XT_26 Page 6 of 40
2.2 Mounting
The control panel should be mounted on a dry, flat surface, at eye height to the display 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 three
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.
G
P
E4
E4
Figure 1. Mounting

Product Manuals/Man-1088_Sigma XT_26 Page 7 of 40
3. Technical specification
ITEM ELECTRICAL RATING COMMENT COMMUNICATION PARAMETERS
Mains supply 230V AC, 50Hz +10% - 15% (100 Watts maximum) Standard European mains connection
Mains supply fuse 1.6 Amp ( F1.6A L250V) Replace only with similar type
Power supply rating 3 Amps total including battery charge 28V +/- 2V
Maximum ripple current 200 millivolts
Battery type (Yuasa NP) Two 12 Volt sealed lead acid in series, Flame retardant UL94:V-0 7Ah maximum
Battery charge voltage 27.6VDC nominal (temperature compensated) See chart below Modulated DC
Battery charge current 0.7A maximum Modulated DC
Battery fuse 20mm, 3.15A glass Replace only with the same type
Current draw in mains fail condition 0.095 Amps With buzzer sounding
Current draw in second stage alarm 0.235A Two zones in fire (470 ohm in circuit)
Current draw in post discharge condition 0.310A Second stage and solenoid outputs active
Maximum current draw from batteries 3 Amps With main power source disconnected
R0V output Fused at 500mA with electronic fuse 200 milliamp maximum load
Sounder outputs 21 to 28V DC Fused at 500mA with electronic fuse 1.6 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
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 0.5mm
2
to 2.5mm
2
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 Three. 21 to 28V DC
No. of sounder circuits Three. 21 to 28V DC 2 x first stage, 1 x second stage
Extinguishant release output 21 to 28V DC. Fused at 1 Amp 1 Amp maximum load –for 5 minutes Voltage reversing DC
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) 10K ohm to 2K ohm Use 6K8 end of line resistor
Detector alarm threshold 1K ohms to 390 ohms Nominal trigger resistance 470 ohms
Call point alarm threshold 370 ohms to 150 ohms Nominal trigger resistance 270 ohms
Short circuit threshold 130 ohms to 0 ohms
Head removal condition 15.5 to 17.5 volts +/- 5% 2-wire detector base or schottky diode base
Cabling FP200 or equivalent (max. capacitance 1uF max inductance 1 millihenry) 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- RS485 data cable (EIA-485 specification)
Status unit power output 21 to 28V DC,Fused at 500mA with electronic fuse 300 milliamp maximum load
Table 1 - Electrical s
p
ecifications

Product Manuals/Man-1088_Sigma XT_26 Page 8 of 40
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
EVC-P OPTICAL Nittan 36
EVC-H-A2 HEAT Nittan 45
EVC-H-C HEAT Nittan 45
Z630-2 OPTICAL Ziton 27
Z620 HEAT Ziton 27
Z610 IONISATION Ziton 27
MPT950 MULTISENSOR COOPER 57
MID810 IONISATION COOPER 114
MPD820 OPTICAL COOPER 123
MFR830 HEAT COOPER 76
MHT890 HEAT COOPER 89
MMT860 HEAT COOPER 89

Product Manuals/Man-1088_Sigma XT_26 Page 9 of 40
CT3000 O OPTICAL DETECTOMAT 19
CT3000 T HEAT DETECTOMAT 19
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.
No more than 32 devices (detectors and call points) should be fitted to any one zone.
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
YB0-R/6PA 2 WIRE BASE Hochiki
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
ORB-SW-10005-APO Sav-Wire Base Apollo
Z6-BS5 STANDARD ZITON
ZC6-CP1 CALL POINT ZITON
470 OHM MCP1 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 K1406 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
MTL5561 DETECTION ZONE GALVANIC ISOLATOR MTL
MTL7778ac ALL SOUNDER CIRCUITS MTL
Note: Use galvanic isolator with Hochiki or Apollo detectors only

Product Manuals/Man-1088_Sigma XT_26 Page 10 of 40
4. Control panel fascia
In addition to the mandatory controls and indications required by the EN54-2 and EN12094-1
standards, three, seven segment LED displays and MODE, SELECT and ENTER buttons are
provided to allow easy entry and storage of codes to configure the control panel to suit the
requirements of the installation. The Lamp Test, Mode and Select buttons also have a sub-script
(+100, +10 and +1) that allows easy entry of numbers.
Figure 3. Front panel fascia
The fascia is divided into two sections. A standard EN54-2 control and indicating equipment
section with three zones and an EN12094-1 extinguishant system section with extinguishant
status and disablements separated for clarity.
The pushbutton controls and programming facilities are common for both sections.

Product Manuals/Man-1088_Sigma XT_26 Page 11 of 40
4.1 Removing the fascia
Open the control panel lid using the 801 lock key.
Before the fascia 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 fascia of the control panel is held in place by two screws. Undo the two screws and lift the
fascia gently away from the box towards you.
With the fascia removed there is much more room inside the panel for making off and dressing
cables.
When cabling work is complete the fascia can be re-fitted with the two countersunk screws and
the terminal block plugged back onto the pins on the board.
Figure 4. Removing the fascia

Product Manuals/Man-1088_Sigma XT_26 Page 12 of 40
5. Connecting to the circuit board
All connections for field wiring are to a single row of terminals along the top of the circuit board.
Shielded fire alarm cable such as FP200 and metal cable glands must be used for all connections
to the panel. 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.
Terminals are capable of accepting wires of up to 2.5mm2.
Wiring must not go across the front of the circuit board. 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.
Figure 5 Wiring to the circuit board
SW14
SW 11 SW 10 SW 12
X1
X2
VR2
DI G0 DI G1 DI G2
SW13
MA N .
RELE ASE
EXTINGUISHANT
2ND STAGE
CON.
1ST S TAGE
CON.
FLOODING
ZONE FLT.
MAN UA L
ONLY
AUTO
& MANUAL
EXTRACT
FAN
ENTERSELECTMOD ELAMP TEST
RES ET ALARM/ FAULT
WARNING
SILENCE
AILENCE/SOUND
ALARM
EXT.
RELEASED
REL.
IMMINENT
1ST S TA GE
ACT.
HOLD
ACTIVATED
123
FIRE IN ZONE
GENERAL
FAULT
POWER
FAULT
SYSTEM
FAULT
SOUNDER FA ULT
/DISABLEMENT
ALARM/FAULT
WARNINGSILENCED
DELAY ON
GEN ERAL
DISABLEMENT
TEST MODE
ON
POWER ON
MAINS
FAIL BATT. FAIL CPU
FAULT AUX 2 4V FAULT BATT.
LOW COM M S FAULT EARTH FAULT SYS. F USE FAULT S1 FAULT S2 FAULT EXTING
FAULT HOLD
FAULT MAN. REL. FAULT MODE FAULT RELEASE FAULT LOW PRES. FAULT TELL TALE
EXTING W/DOG RES ET RESET
WRITE
ENABLE
RELASE
MA N UA L
PROC.
TERMINATE
ZONEFAULT/TEST
/DISABLEMENT
+
E
-
ROV
+
SIL AL FLT RST
+ - + - + - + - + - + -
+ - + -
NC C NO NC C NO
+ - + - + - + - + - NC CNCC
NO NC C NO NC C NO
+ -
FIRE RLYLOCAL FIREFAULT RLYEXTRACTLOW
PRES.
SWITCH
EXTING
PRES.
SWITCH
REL.HOLD
MAN.
RELEA SE
MODE
SELECT
2NDSTAGE1ST STAGE2ND
SOUNDER
ZONE3ZONE1 ZONE2S2S1
1ST STAGE
SOUNDERS
POWERDATA
STATUS UNITS
REMOTE CONTROL
AUX
24V
2NDSTAGE
SNDR FAULT
FIR E
COMMON LOW PRESSURE
CORRECT
INCORRECT INCORRECT

Product Manuals/Man-1088_Sigma XT_26 Page 13 of 40
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 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.
Figure 6. Detection zone wiring
7. Sounder circuit wiring
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 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.
A maximum of 1.6 Amps is available for powering sounders with a maximum load of 0.5 Amps on
any one circuit.
Figure 7. Sounder circuit wiring

Product Manuals/Man-1088_Sigma XT_26 Page 14 of 40
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 C63 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.
Figure 8. Detection zone wiring through an MTL5561 I.S .barrier
Figure 9. Sounder circuit wiring through an MTL7778ac I.S. barrier

Product Manuals/Man-1088_Sigma XT_26 Page 15 of 40
9. Connection to monitored inputs
Monitored inputs (Mode select, manual release, Hold, Released pressure switch and Low
pressure switch) have the same characteristics as detection zone inputs and require a 6K8 end of
line monitoring resistor and a nominal, 470 ohm trigger resistor.
Figure 10. 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.
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 30 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 causing interference to the operation of the control panel. This diode
also acts as the end of line monitoring device.
Figure 11. Example of wiring a solenoid

Product Manuals/Man-1088_Sigma XT_26 Page 16 of 40
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.
Figure 12. Example of wiring to actuators
10.3 Setting up extinguishant monitoring circuit
All control panels are supplied with end of line diodes for the connection of solenoids. It should not
be necessary to adjust the fault monitoring circuit in this configuration, unless the panel fails to report
a short circuit fault when tested by shorting the end of line device. If igniting actuators are to be
used, then the set up procedure detailed here should be followed.
To enable monitoring of circuits that have a very low resistance which varies according to the
number of actuators fitted and cable length, it is necessary to adjust the monitoring level once the
actuators have been fitted.
This is done using a variable resistor which is accessible through the front of the control panel
Make sure the extinguishant output is not active and no other faults are displayed when carrying
out this setting up procedure i.e. panel is in the quiescent state.
Adjustment
Rotate the extinguishant adjust control anticlockwise to illuminate the Fault lamp - anticlockwise >
ON
Rotate the extinguishant adjust control clockwise to extinguish the Fault lamp - clockwise > OFF

Product Manuals/Man-1088_Sigma XT_26 Page 17 of 40
For 3 or more actuators
Rotate the extinguishant adjust control until the Fault lamp lights. By rotating the extinguishant
adjust control back and forth the Fault lamp can be toggled on and off, this is usually between ¼
and ½ a turn. Establish these points and leave the extinguishant adjust control set with the Fault
lamp just off.
Check the Fault lamp lights when shorting the extinguishant output end of line device and the
lamp goes out when the short is removed. Repeat several times to check for reliable operation. If
the fault lamp is delayed going off or doesn’t go off, then slightly adjust VR2 clockwise and repeat
this paragraph
If nuisance tripping occurs then adjust the extinguishant adjust control clockwise in steps of 5
minutes (as per a clock face) until the nuisance tripping stops. Be sure to check after each
adjustment that shorting the extinguishant end of line device will illuminate the Fault lamp and
removing the short extinguishes the Fault lamp
For 1 or 2 actuators
Values between 2 ohms and 5 ohms can be detected and a fault level set but the adjustment is
very fine and may be difficult to set, the lower the value, the finer the adjustment.
Rotate the extinguishant adjust control until the fault lamp lights. By rotating the extinguishant
adjust control until back and forth, the fault lamp can be toggled on and off, this is usually about ½
a turn of the extinguishant adjust control until. Establish these points and leave the extinguishant
adjust control until set with the Fault lamp just off.
Short circuit the Extinguishant end of line device and wait for up to 20 seconds for the
Fault lamp to light, if it doesn’t, remove the short and tweak the extinguishant adjust control until
anticlockwise about 2 minutes (as per a clock face) or less and then reapply the short. Keep doing
this until the fault lamp lights. Once it lights, check that removing the short
Extinguishes the Fault lamp, if it doesn’t, turn the extinguishant adjust control slightly clockwise.
Apply the short several times and make sure the fault lamp lights each time reliably, if it doesn’t
repeat the above paragraph until it does.
Figure 13. Extinguishant adjust control and Exting fault LED

Product Manuals/Man-1088_Sigma XT_26 Page 18 of 40
11. Connection to remote control terminals
Some functions of the control panel can be controlled externally from the panel if required. The
external equipment operating inputs must be restricted by an access level 2 control as defined
in EN54-2 The functions are abbreviated at the terminals block as follows:
a) Remote 0 V supply – ROV
b) Silence Alarm – SIL (Silences sounder outputs S1 &S2 only)
c) Sound Alarm – AL (Operates sounder outputs S1 & S2 and not S3)
d) Fault – FLT (Generates a general fault and operates the fault relay)
e) Reset – RST (Resets the system back to normal condition)
To activate these inputs, the remote 0 Volt (R0V) supply must be connected to the input via a
normally open switch or contact and via a resistance of no greater than 100 ohms.
All of the remote control inputs are non-latching.
12. Aux 24V DC supply
An auxiliary 24V DC supply is provided to enable local signalling or control of ancillary systems
such as door release controllers.
The terminals for the Aux 24V supply are labelled Aux 24V and ROV. The ROV terminal is the
negative terminal and is the same terminal that should be used to switch the remote control
terminals.
It is possible to make the ROV terminal pulsing so that by connecting it to the AL terminal via a
remote, volt free contact, it can be used to pulse the dedicated sounder circuits in response to a
signal from another system for example to give an alert. See programming code C25.
The supply is fitted with an electronic, self resetting fuse rated at 0.5 Amps to protect the control
panel’s 24V supply in the event of a wiring fault.
Any standing load on the Aux 24V supply must be taken into account when calculating battery
standby times as standby time will be significantly affected by even modest standing loads. It is
recommended that the Aux24V output is not used to power standing loads.
Where the Aux 24V supply is used to power electromechanical devices such as relays or door
retainers it is imperative that a suppression diode is fitted across the coil of the device to prevent
the generation of high voltage transients back to the control panel power supply.

Product Manuals/Man-1088_Sigma XT_26 Page 19 of 40
13. Connection to relay contacts
Volt free changeover relay contacts are provided for local control and signalling if required. These
contacts are rated for switching signalling circuits only and the maximum ratings listed in table 1
should not be exceeded under any circumstances.
Typically, the Aux 24V output of the control panel is switched through these relays and used to
control other systems.
13.1 Fault relay
The fault relay is normally energised and will de-energise upon any fault condition including total
loss of power. These also include the following inputs and monitored circuits:
Low Pressure Input Active
Low Pressure Fault
Zone Fault
Sounder Fault
Ext Output Fault
Fault – FLT Remote Input Active
Battery Fault
13.2 Local fire relay
The fire relay will energise upon activation of a fire condition on any of the zones or pressing of the
sound alarm button on the front panel. The relay will remain activated until the alarm is silenced or
the panel is reset. This relay will not operate upon activation of the remote AL input.
13.3 Fire relay
The fire relay will energise upon activation of a fire condition on any of the zones or pressing of the
sound alarm button on the front panel. This relay will not operate upon activation of the remote AL
input. The relay will remain activated until the panel is reset.
13.4 1st stage alarm
The first stage alarm will operate upon activation of a zone that has been configured to contribute
to the extinguishant release decision and will de-activate only when the panel has been reset.
This relay will also operate upon activation of the panel mounted or a remote manual release
switch.
13.5 2nd stage alarm
The second stage alarm relay will operate when the panel enters the activated condition (i.e. the
release countdown timer has started) and will de-activate only when the panel has been reset
from the released condition.
13.6 Extract relay
The extract relay will operate when option Ac is selected at access level 2.
This provides a means to vent a room of extinguishant gases but prevents the gases from being
vented during a discharge.

Product Manuals/Man-1088_Sigma XT_26 Page 20 of 40
14. Connection and configuration of status units and ancillary boards
The control panel should not be powered during the connection of status units or ancillary
boards.
Status units and ancillary boards require a four-wire connection from the panel, which drops into
each unit and connects to the corresponding data and power, in and out terminals. Two of the
cables carry power to the units (24V) and the other two carry data. A four core cable suitable for
carrying RS485 data should be used. If this is a twisted pair cable then one twisted pair should be
used for the data connections and the second pair used for the power connections
Each status unit has a 3-bit DIL switch and must be allocated a unique address between 1 and 7.
Each ancillary board has a 3-bit DIL switch and must be allocated a unique address between 1
and 7.
The address switch is located on the bottom left
hand corner of the status unit or ancillary board
PCB. Note: The address is only read when the
boards are first powered so address switches
should not be altered on a system that has power
applied.
If a double address occurs on the system then
the system will illuminate the General fault and
Hold indicators and the buzzer will sound.
The panel display will show the status unit or
ancillary boards that have the same address.
14.1 Adding new status units/ancillary boards
When the system is powered, it will search for connected status units and/or ancillary boards.
When new or additional status units/ancillary boards are added to the system, these will be shown
on the display when the system is first powered.
Status units are shown as Pux and ancillary boards are shown as Pox (where xis the address of
the unit found).
The select key can be used to view all of the status units/ancillary boards that the system has
found.
These should be checked to ensure that the same number of devices that have been fitted are
found by the system.
For the system to accept these into its memory, the procedure below must be followed.
1. Operate the Enable Controls keyswitch.
2. Enable the Write Enable Switch (push to the right) – Access level 3.
3. The display will show Pux for status units and Pox for ancillary boards that are found
(where x is the address of each unit) and the dot in the display will be flashing. Operate the
Enter button which will accept the displayed unit and step through to the next unit found.
4. When the Enter button does not step on to any other units, all devices have been
accepted.
5. Disable the Write enable switch (push to the left).
6. Disable the Enable controls keyswitch.
7. The panel should return to the normal, quiescent condition.