Elmdene 2405STE User manual

Technical Support Line [phone] 2405STE PAK200479 Issue 04I May 2016 Page 1 of 4
ELMDENE INTERNATIONAL LIMITED
3 KEEL CLOSE
INTERCHANGE PARK
PORTSMOUTH
HAMPSHIRE
PO3 5QD, UK
TEL: [phone]
FAX: [phone]
www.elmdene.co.uk
2405STE Intelligent Switch Mode Powe
r Supply: EN54
-
4 Certified
27.6Vdc 5A PSU with Intelligent Battery Charging, Monitoring and Remote Fault Signalling
O VERVIEW
The 2405STE is a fully featured EN54-4 approved power supply ideal for use in Fire Systems and Access control applications. Its regulated
27.6V dc output will supply up to 5A continuous into the load, in addition to providing up to 1.6A for charging the standby batteries. 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 three stage charger, comprising bulk, absorb and temperature
compensated final float phase depending upon battery condition. 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.
•Certified by VdS to EN54-4:1997 +A1: 2002 + A2: 2006
•5A current to load at 27.6V dc nominal regulated output
•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
•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 to 21V
•Automatic start-up on battery only
•Fault indicator LED (Red) flashes on detection of output fault, battery fault, charger fault and mains failure
•Mains indicator LED (green) showing mains present
C OMPLIANCE
This power supply unit complies with the following European Directives:
Low Voltage: 2014/35/EU EMC: 2014/30/EU WEEE: 2012/19/EU RoHs2: 2011/65/EU CPR 305/2011 EU
S PECIFICATION
Input
Voltage 93Vac minimum, 264Vac maximum
Frequency 45Hz – 65Hz
Current 2.5A maximum for a 5A load and 1.6A battery charging
Inrush current 30A maximum @ 25
O
C, 110Vac for 10ms
Mains input fuse T3.15A 20mm, 250Vac HBC
Output
Voltage 26.0Vdc – 28vdc on mains power / 18Vdc – 26Vdc on battery standby
Load Current 0 - 5A
Ripple 100mV max over full rated mains voltage
Load output fuse F5A 20mm, 250Vac glass
Overload Electronic shutdown at 8A until overload or short circuit removed
Standby Battery
Battery Capacity 2 x 17Ah to 2 x 38Ah maximum (e.g. Yuasa NP17-12 or NP38-12) series connected
Battery fuse protection F5A 20mm glass
Battery Charging Constant current (1.6A) bulk charging to 80% within 24 hours, float charging to 100% within 48 hours
Low Battery Threshold Voltage 23V nominal
Deep discharge protection Battery disconnect at 21V nominal
Quiescent current - no load 25mA nominal
Quiescent current - battery cut off <70µA
Mechanical
Case material 1.2mm steel, white powder coated
Size 400mm W x 420mm H x 80mm D
Weight 6.2kg (excluding batteries)
Environmental
Temperature -10 to +40
O
C (operating) 95% RH non-condensing
-20 to +80
O
C (storage)
C ONNECTIONS
O/P + and - Voltage output to load
PSU Fault Solid State Relay output contacts
EPS fault Solid State Relay output contacts
Temp sensor Connection to battery temperature sensor
BATT + and - Connections to standby batteries
FAN + and - No Connection
VdS
G209142
09
0786
-
CPD
-
20787

Technical Support Line [phone] 2405STE PAK200479 Issue 04I May 2016 Page 2 of 4
F EATURES
Loss of Mains and Brown-out compensation
If the mains input has been lost for greater than 10s, a Loss of Mains condition is detected, an EPS Fault is signalled and the green Mains LED is
extinguished. Short duration mains “brown-out” conditions are not signalled thus reducing nuisance alarms. The red Fault LED will show a heart-beat
pulse indicating that the PSU is operating correctly in standby mode.
Standby Operation
When the mains input is lost, the power supply will automatically switch to the standby batteries and provide uninterrupted power the connected load
whilst there is capacity in the standby batteries. The front panel Fault LED is pulsed periodically to indicate that the PSU is healthy and operating in
standby mode.
During standby operation, the standby battery voltage is continually monitored. Once this drops below the Low Battery Voltage threshold
(approximately 23V), a PSU Fault signal is generated and a Low Battery condition is signalled on the front panel LED.
Battery Management
The standby batteries are tested regularly. If a battery becomes disconnected, a PSU Fault signal will be generated within 20s of the disconnection.
If the impedance of the battery circuit connections increases above 500mΩ, for example due to corrosion or damage to the cabling, a PSU Fault
signal will be generated within 60 minutes.
If the battery is unable to supply significant current to the load, for example due to cell degradation, a PSU Fault signal will be generated within 24
hours.
Battery Charging
The standby batteries are charged automatically when the mains is present. The PSU uses a fast bulk charge regime to quickly recharge the
batteries to approximately 80% capacity followed by a reduced charging current to reach full capacity. The batteries are held at full capacity using a
temperature compensated float regime. The battery temperature is measured at its terminals using a special sensing probe. An extended probe may
be fitted for use with an external standby battery pack.
Note: if the batteries are disconnected the battery charger is switched off and there will be NO measurable voltage at the BATT terminals.
Battery Auto-Start
The power supply will self-start if a set of charged standby batteries are connected without any mains present. An EPS Fault signal will be generated
under this condition.
Note: a pause of 5s must be observed between repeated battery connections and disconnections to guarantee an auto-start.
S IGNALLING
Fault Outputs: 100mA @ 60Vdc solid state relay (Open indicates fault condition)
EPS Fault PSU Fault Condition Possible Cause Action
C LOSED C LOSED Normal operation Mains present
Battery fully charged
None
O PEN C LOSED Standby Mode Mains lost
Battery driving load
Investigate loss of mains
C LOSED O PEN Fault Present Blown fuses
Battery fault
Overload
Internal fault
Investigate fault source using
diagnostic LED
Rectify fault where possible
O PEN O PEN PSU Shutdown Mains lost
Standby battery exhausted
Restore mains as soon as
possible
Local Indicators – front panel
Red LED
Fault
Green LED
Mains Condition Possible Cause Action
O FF O N Normal operation Mains present
Battery fully charged None
F LASH
C ONTINUOUS O
N or O FF Fault
Blown fuses
Battery fault
Overload
Internal fault
Contact service engineer
1 P ULSE O FF Standby Mode Mains lost
Battery driving load Investigate loss of mains
Diagnostic Indicator – internal
Red LED
Diagnostic
Green LED
Mains Condition Possible Cause Action
O FF
O N Normal operation Mains present
Battery fully charged None
O FF Standby Operation Mains Lost. No faults present
Battery driving load Investigate loss of mains
O N
C ONTINUOUS O
N or O FF Internal Fault Software fault detected
PSU running in Safe Mode Return to manufacturer
F LASH
C ONTINUOUS O
N or O FF No output
Output fuse blown
Output overload
Output short circuit
Check and replace output fuse
Disconnect output load and test load
1 P ULSE O N Battery Charging
No faults active
Battery charging normally but
< 90% of full charge
None
2 P ULSES
O N No Battery
Battery disconnected
Battery fuse blown
Battery heavily discharged
Check battery connections
Check and replace battery fuse
Check battery terminal voltage and
replace if battery aged
O FF Low Battery Volts Standby Mode
Battery almost discharged Restore mains as soon as possible
3 P ULSES O N or O FF Battery Fault
High impedance in battery
connection
Battery internal fault
Check battery connections for damage
e.g. corrosion. Replace battery if aged
4 P ULSES O N or O FF Charger Fault Internal failure of battery charger Return to manufacturer
5 P ULSES O N or O FF Battery Temperature
Probe Fault
Battery temperature monitor
disconnected or damaged
PSU running in Safe Mode
Check temperature sensor
connections and condition of sensor
and cable
Replace if suspect

Technical Support Line [phone] 2405STE PAK200479 Issue 04I May 2016 Page 3 of 4
I NSTALLATION
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 3A 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 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 3A or greater current capacity, i.e. 0.5mm
2
nominal conductor area, having a
minimum operating voltage of 300/500 Vac.
2) The low voltage output cable must be sized to carry the rated load current to the devices connected to the PSU.
3) Mains input and low voltage output cables should be routed to use different entry / exit holes in the case. Bushes should be used to protect
cable sheaths from chafing. Ensure that these bushings are correctly sized (i.e. close fitting with respect to cable sizing). Note that the
bushes should meet a minimum flammability specification of UL94 HB.
4) All cabling should be securely fastened in position using a cable tie through the saddles provided.
Mounting
5) Fix to wall or other support structure in correct orientation i.e. with hinge on left hand side, using screws of sufficient size and length through
the mounting holes.
6) PSU should be mounted no further than 10cm from the control and indicating equipment, close coupled by conduit.
7) Knock-outs are provided in the case for mating with external trunking or conduit.
8) Ensure that all unused holes (on the rear of the case) are sealed to prevent the ingress of damp and dust.
C OMMISSIONING
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. Ensure that the green Mains LED illuminates and that the red Fault LED flashes after approximately 20s (indicating a
disconnected battery).
3) Disconnect the mains power.
Load Output and Remote Signalling
4) Connect the EPS and PSU Fault outputs to the appropriate inputs of control equipment if remote fault monitoring is required.
5) Loop the load (output) wiring through the supplied ferrite EMC suppressor as shown in Figure. 1. Cable tie to saddle provided (adjacent to
exit hole).
6) Re-apply mains. Verify that the green Mains LED illuminates and the red
Fault LED flashes after approximately 20s (disconnected battery).
7) If connected, verify that the EPS Fault monitor shows a closed contact
and the PSU Fault monitor shows an open contact.
8) Perform a full functional test of system including full alarm condition .
Standby Battery
9) Mount two 12V 17Ah batteries in lower part of enclosure.. Higher
capacity batteries should be mounted in a separate battery box (Part
BATT-BOX-3802). All cabling between the two boxes should be routed to
use separate case entry/exit holes from other cabling and use suitable
bushes to protect the cables .
10) Connect the two 12V 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.
11) Connect the free Positive and Negative terminals of the batteries to the PCB terminals Batt+ and Batt - using the cables provided. See Figure
2.
12) If the batteries are housed remotely, replace the battery lead assembly (including battery temperature sensor) with an extended length
assembly (Part BAT-LD-T-24-300), Ensure the temperature sensor and battery connections are made according to figure 2.
13) Verify that the red Fault LED stops flashing after about 20s (battery connection detected). Verify that the remote PSU Fault monitor shows a
closed contact.
14) Disconnect the mains power. Verify that the green Mains LED extinguishes and the red Fault LED starts to pulse (indicating that the PSU is
running from its standby batteries).
15) If connected, verify that the EPS Fault monitor shows an open contact and the PSU Fault monitor shows a closed contact.
16) 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.
Final
17) Reconnect the mains. Verify that the green Mains LED illuminates and the red Fault LED extinguishes.
18) If connected, verify that the EPS Fault monitor shows a closed contact and the PSU Fault monitor shows a closed contact.
19) Close cover and secure using fastening screws provided.
O PERATING I NSTRUCTIONS
This unit is intended for use by Service Personnel only. There are NO USER SERVICEABLE parts inside.
The green Mains LED will be illuminated whilst the mains supply is present. In the event of a failure, the red Fault LED will flash and the solid state
remote fault output contacts will open.
Figure 1 - Ferrite EMC suppressor
Figure 2
–
C
onnec
tion of battery leads
and temp sensor to terminal block.

Technical Support Line [phone] 2405STE PAK200479 Issue 04I May 2016 Page 4 of 4
M AINTENANCE
There is no regular maintenance required of the PSU as the microcontroller performs regular health checks of the battery and output voltage.
However, 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.
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. The following fuses may need to be replaced. Ensure the correct fuse rating and type is used.
Load Output Fuse F5A 20mm, 250Vac glass
Internal Mains Fuse T3.15A 20mm, 250Vac HBC
Battery Fuse F5A 20mm, 250Vac glass
CAUTION
Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according to the
battery manufacturer’s instructions and all local and national regulations
The packaging supplied with this product may be recycled. Please dispose of packaging accordingly.