Elmdene STX2402-MOD User manual

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Technical Support: [phone] (option 3) PAK200608_01FJan 2021 ©2019 ELMDENE INTERNATIONAL LTD
27.6V dc 2A Switch Mode Power Supply for Fire, Access and General Applications
STX2402-MOD
FEATURES
The STX2402-MOD is an un-boxed switch mode power supply ideal for use in Fire, Access Control and
General Applications. Its regulated 27.6V dc output will supply up to 2.0 Amps continuously into the
load, in addition to providing up to 700mA for charging the standby batteries up to 18Ah. The power
supply output features electronic short circuit protection under both mains and standby battery
operation. Maximum battery life is assured through continuous active battery monitoring and the use
of a two stage charger, comprising bulk and temperature compensated final float phase depending
upon battery condition. Once fully charged the product operates in Eco power saving mode, whereby
the batteries are charged for 4 hours in every 24 hour period while still being continuously monitored.
This reduces wasted energy in charging already fully charged batteries and extends their working life.
Deep discharge protection prevents premature battery failure when operating from standby for
extended periods. Two sets of volt free solid state relay fault output signal (i) loss of mains and (ii)
battery fault, charger fault and loss of output.
•Up to 2.0A current to load at 27.6V dc nominal regulated output.
•Charging capability to support 7Ah or 17/18Ah batteries.
•Electronic overload protection shuts down output until overload or short circuit is removed.
•Battery Monitor detects battery missing, low battery, short-circuit or reverse connection or circuit
impedance (Ri) in excess of 500mcaused by connector or wiring corrosion within 4hours.
•Battery charging circuit is energised only when a battery is correctly connected and the battery voltage
is greater than 14V.
•No loss of output during automatic connection of battery to load on loss of mains.
•Deep discharge protection disconnects battery from load when battery voltage falls below 21V.
•Diagnostic indicator LED (Orange) (Internal).
•Fault indicator LED (Yellow) flashes on detection of output fault, battery fault, charger fault and mains
failure.
•Mains indicator LED (Green) showing mains present Indicators check at start-up.
Elmdene International Ltd Tel: [phone]
3 Keel Close, Interchange Park, Fax: [phone]
Portsmouth, Hampshire, PO3 5QD, UK Web: www.elmdene.co.uk
0843-CPR-0416 18 (UL)
2531-CPR-CSP11220 20 (DBI)

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Technical Support: [phone] (option 3) PAK200608_01FJan 2021 ©2019 ELMDENE INTERNATIONAL LTD
SPECIFICATION
Mains Input
Rated Voltage
(Operational voltage)
110 –240V ac
(90 –264V ac)
Frequency
50/60Hz
Input current
< 1.0 Amps at full load
Inrush current
5A Max at 25 °C 110V ac for 10ms
Fuse
T2.0A 20mm, 250V ac HRC
Output
Voltage at full load
Mains power
Battery standby
27.0 –28.3V dc (27.6V nominal)
20.3 –26.0V dc
Ripple
<100 mV pk –pk max @ Rated Voltage
Fuse
Load
Battery
F2.5A
F2.5A
Battery mode selected
2.1Ah
7Ah
17/18Ah
(Link fitted)
Continuous Output Current
No charging (Imax B)
With charging (Imax A)
2.5A
2.0A
2.5A
2.0A
2.5A
1.8A
Battery Capacity
eg
-PowerSonic model
-Yuasa model
-Interlogix model
2 x 2.1Ah 12V
PS12021
NP2.1-12
2 x 7Ah 12V
PS12070
NP7-12
2 x 17/18Ah 12V
PS12170
NP17-12
BS131N
Battery Charging
Constant current bulk charging to 80% capacity within 24 hours
Float charging to 100% within 48 hours
Eco charging and check every 24 hours –(for up to 8 hours pulse
charge dependent on temperature)
Constant current charge
0.3A
0.7A
Low battery threshold voltage
23V
Deep discharge protection
Threshold voltage –21V
Quiescent current –no load
<30mA @ 27.6V
Quiescent current –batt cut off
0mA @ 27.6V
Mechanical
Product Reference
STX2402-MOD
Module Dimensions
w x h x d (mm)
150 x 207 x 52
Weight (kg)
0.34
Environmental
Temperature –Operating
-10 to +40°C (operating) 75% RH non-condensing
Temperature - Storage
-20 to +80°C (storage)

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Connections and Signalling outputs
Load Output +/ -
Screw terminals Voltage output to load
GEN PSU Fault (normally
closed contact)
0.10A @ 60V dc 16Ω solid state relay contacts, volt free
Open if Mains failed and battery voltage <23V or fault PSU fault
condition, (see below)
EPS Fault (normally closed
contact)
0.10A @ 60V dc 16Ω solid state relay contacts, volt free
Open if loss of mains for >10 seconds
Temperature sensor
Thermistor input from supplied battery terminal thermistor.
BATT + / -
Connection to back up battery using supplied battery lead.
SIGNALLING AND DIAGNOSTICS
Fault Outputs
EPS Fault
GEN Fault
Condition
Possible Cause
Action
CLOSED
CLOSED
Normal
operation
Mains present
Battery healthy
None
OPEN
CLOSED
Standby
Mode
Mains lost
Battery driving load
Investigate loss of mains
CLOSED
OPEN
Fault
Present
Blown fuses
Battery fault
Internal fault
Investigate fault source
using diagnostic LED
Rectify fault where
possible
OPEN
OPEN
PSU
Shutdown
Mains lost
Standby battery exhausted
Restore mains as soon
as possible
LED Indication
YELLOW LED
Fault LED
GREEN LED
Mains supply On
DIAGNOSTICS
Diagnostic LED
Fault Diagnostic table –Front panel - User
Yellow LED
Fault
Green LED
Mains
Condition
Possible Cause
Action
OFF
ON
Normal
operation
Mains present
Battery healthy
None
FLASH
CONTINUOUS
ON or OFF
Fault
Blown fuses
Battery fault
Internal fault
Contact service
engineer
1PULSE
OFF
Standby Mode
Mains lost
Battery driving load
Investigate loss of
mains

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Fault Diagnostic table –Internal - Engineer
Orange LED
Diagnostic
Green LED
Mains
Condition
Possible Cause
Action
OFF
ON
Normal operation
Mains present
Battery fully charged
None
OFF
Standby
Operation
Mains Lost. No faults present
Battery driving load
Investigate loss of mains
FLASH
CONTINUOUS
ONor OFF
No output
Output fuse blown
Output overload
Output short circuit
Check and replace output
fuse
Disconnect output load
and test load
1PULSE
ON
Battery Charging
No faults active
Battery charging normally but
< 90% of full charge
None
2PULSES
ON
No Battery
Battery disconnected
Battery fuse blown
Battery heavily discharged
Check battery
connections
Check battery fuse
Check battery condition
Replace battery if aged
OFF
Low Battery Volts
Standby Mode
Battery almost discharged
Restore mains
3PULSES
ONor OFF
Battery Fault
High impedance in battery
connection
Battery internal fault
Check battery
connections for
corrosion. Replace
battery if aged
4PULSES
ONor OFF
Charger Fault
Internal failure of battery charger
Return to manufacturer
5PULSES
ONor OFF
Battery
Temperature
Probe Fault
Battery temperature monitor
disconnected or damaged
PSU running in Safe Mode
Check temperature
sensor connections and
condition of sensor.
Replace if suspect

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INSTALLATION
This unit is only suitable for installation as permanently connected equipment. The PSU is NOT SUITABLE for
external installation.
This unit must be fed from a mains power source having a separate (approved) disconnect device and fitted with a
fuse or other over-current protection device rated at 5 A maximum. Ensure that the disconnect device used has
appropriate earth fault protection to the applicable standard.
Where the PSU is used to provide power to a fire alarm circuit, the mains isolation and disconnect device should be
provided solely for this purpose and be suitably marked “FIRE ALARM – DO NOT TURN OFF”. All cabling should meet
national and local fire system installation regulations, e.g. FP200 type cable for high integrity installations.
Where the PSU is used for other applications, it should be installed according to all relevant safety regulations
applicable to that application.
Where the GEN PSU Fault and EPS Fault outputs are used, they should only be connected to circuits having voltages
less than 60V dc.
Cable Sizing
1) Mains input cable must be to the applicable standard with a 5A or greater current capacity, i.e. 0.75mm2
nominal conductor area, having a minimum operating voltage of 300/500V ac.
2) The low voltage output cable must be sized to carry the rated load current to the devices connected to the
PSU.
3) All cabling should be securely fastened in position.
Mounting the Module
4) Fix the module into the chosen enclosure using 3 x fixing points as per Fig 1 (all fixings must be used).
Ensure sufficient space for heat dissipation and adequate ventilation to avoid overheating of the unit or
associated batteries.
Figure 1 –Fixing Points
COMMISSIONING
Mains Power Up
1) With no external connections made to the PSU, connect the mains input wires to the terminal block,
ensuring that the mains isolator (disconnect device) is open. Fasten wiring in place with cable tie to
saddle. Note: Equipment must be earthed.
2) Apply mains input. Confirm that all LED indicators flash on briefly proving integrity of indicating circuits.
Ensure that the green Mains LED then stays illuminated and that the yellow Fault LED flashes after
approximately 3s (indicating a disconnected battery).
3) Disconnect the mains power.
Load Output and Remote Signalling
4) Connect the EPS and GEN PSU Fault outputs to the appropriate inputs of control equipment if remote fault
monitoring is required.
5) Connect the load (output) wiring as shown in Figure 2.
Module Dimensions
150 x 207 x 52 (mm)
75mm
12mm
128mm
98mm

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Figure 2 - Connections
6) Re-apply mains. Verify that the green Mains LED illuminates and the yellow Fault LED flashes after
approximately 3s (disconnected battery).
7) If connected, verify that the EPS Fault monitor shows a closed contact and the GEN PSU Fault monitor
shows an open contact.
8) Perform a full functional test of system including full alarm condition.
9) Disconnect the mains.
10) For 17 or 18Ah batteries fit the link to the Battery select pins as indicated, for 7Ah or 2.1Ah batteries
remove link, as shown in Figure 2.
Figure 3 –Terminal labels
Standby Battery
11) With mains disconnected, connect the two 12 V standby batteries in series using the single cable provided.
Connect the negative of one battery to the positive of the other. DO NOT CONNECT the other two battery
terminals to each other.
12) Connect the free Positive and Negative terminals of the batteries to the PCB terminals Batt+ and Batt -
using the cables provided. See Figure 2 and 3.
13) Connect the battery temperature sensor (two white wires) to the PCB terminals Temp Sense. See Figure 4.
Wires can be connected either way around.
14) Re-apply mains and, after the LED indicators initial start-up flash, verify that the yellow Fault LED does not
flash (battery connection detected). Verify that the remote GEN PSU Fault monitor shows a closed contact.
15) Disconnect the mains power. Verify that the green Mains LED extinguishes and the yellows Fault LED starts
to pulse (indicating that the PSU is running from its standby batteries).
16) If connected, verify that the EPS Fault monitor shows an open contact and the PSU Fault monitor shows a
closed contact.
17) Perform a full functional test of system including full alarm condition. Verify that the standby batteries can
support the system load. Note: ensure batteries have sufficient charge.
+ - | + - |Temp| GEN EPS
Load | Batt |sense| Fault
BATT FUSE
2.5 Amp
LOAD FUSE
2.5 Amp
+
+ -
To Load
L E N
Mains
Temperature
Sensor connect
Diagnostic LED
Fault LED
Mains ON
Battery Select
+
+
-
-

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Final
18) Reconnect the mains. Verify that the green Mains LED illuminates and the yellow Fault LED extinguishes.
19) If connected, verify that the EPS Fault monitor shows a closed contact and the GEN PSU Fault monitor
shows a closed contact.
NOTE: Batteries must be connected before mains power is applied to enable the
batteries to be utilised. When replacing batteries, re-connect new batteries and then
cycle the mains power.
OPERATING INSTRUCTIONS
In the event of loss of mains, a battery fault or a GEN PSU fault, the corresponding Fault signal contacts will
open.
If the output of the PSU fails, the cause of the failure should be investigated e.g. short circuit load,
connection of a deeply discharged battery. The fault should be rectified before restoring power to the PSU. If
any of the fuses require replacing, ensure the correct fuse rating and type is used.
MAINTENANCE
This unit is intended for use by Service Personnel only. There are NO USER SERVICEABLE parts inside.
There is no regular maintenance required of the PSU other than periodic testing, and replacement of the
standby battery. Reference should be made to the battery manufacturer's documentation to determine
typical/expected battery life with a view to periodic replacement of the battery.

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Technical Support: [phone] (option 3) PAK200608_01FJan 2021 ©2019 ELMDENE INTERNATIONAL LTD
COMPLIANCE
This power supply unit meets the essential requirements of the
following EU Directives:
DISPOSAL OF PRODUCT AT END OF LIFE
This product falls within the scope of EU Directives 2012/19/EU Waste Electrical and Electronic Equipment
(WEEE) and 2013/56/Eu (Battery). At the end of life, the product must be separated from the domestic
waste stream and disposed via an appropriate approved WEEE disposal route in accordance with all national
and local regulations.
Before disposal of the product, any batteries must be removed, and disposed separately via an appropriate
approved battery disposal route in accordance with all national and local regulations. Package used batteries
safely for onward transport to your supplier, collection point or disposal facility.
Caution: Risk of fire or explosion
if bare battery wires are allowed to touch.
See Specification for battery type information. The battery is marked with the crossed out wheelie bin
symbol, which may include lettering to indicate cadmium (Cd), lead (Pb), or mercury (Hg).
For more information see: www.recyclethis.info
The packaging supplied with this product may be recycled.
Please dispose of packaging accordingly.
EMC:
2014/30/EU
Low Voltage:
2014/35/EU
WEEE:
2012/19/EU
RoHS:
2011/65/EU
0843-CPR-0416 18 (UL)
2531-CPR-CSP11220 20 (DBI)