Comelit EN54C Series User manual

USER MANUAL
EN
Edition: 5 from 21.12.2022
Supersedes edition: 4 from 08.07.2021
Power supplies
EN54C series
v.1.1
Power supplies for fire alarm systems and
smoke and heat control systems.

2
GENERAL SAFETY RULES
Before installation, read the instruction manual to avoid errors that
can damage the device and give you an electric shock.
Before installation, cut off the voltage in the 230 V power-supply circuit.
To switch power off, use an external switch, in which the distance between the
contacts of all poles in the disconnection state is not less than 3 mm.
The shock protection circuit shall be done with a particular care: the yellow and green
wire coat of the power cable should be connected to the terminal marked with
the grounding symbol on the PSU enclosure. Operation of the PSU without the
properly made and fully operational shock protection circuit is UNACCEPTABLE! It
can cause damage to the equipment or an electric shock.
The device should be transported without batteries. This has a direct impact on the
safety of the user and the device.
Installing and connecting the power supply must be carried out without batteries.
When connecting batteries to the power supply, pay particular attention to the correct
polarity. If necessary, it is possible to permanently disconnect the battery from the
power supply systems by removing the FBAT fuse.
The power supply is adapted to be connected to a power distribution network with an
effectively earthed neutral conductor.
Ensure a free, convection air flow around the enclosure. Do not cover the ventilation
openings.

3
TABLE OF CONTENTS
1. PSU FEATURES.....................................................................................................................................4
2. FUNCTIONAL REQUIREMENTS OF THE PSU.............................................................................4
3. TECHNICAL DESCRIPTION..............................................................................................................5
3.1. GENERAL DESCRIPTION........................................................................................................................................................5
3.2. BLOCK DIAGRAM.................................................................................................................................................................5
3.3. DESCRIPTION OF COMPONENTS AND POWER SUPPLY TERMINALS.........................................................................................6
4. INSTALLATION....................................................................................................................................8
4.1. REQUIREMENTS...................................................................................................................................................................8
4.2. INSTALLATION PROCEDURE. ................................................................................................................................................9
4.3. PROCEDURE FOR CHECKING THE POWER SUPPLY AT THE PLACE OF INSTALLATION............................................................10
5. FUNCTIONS.........................................................................................................................................11
5.1. CONTROL PANEL................................................................................................................................................................11
5.2. TECHNICAL OUTPUTS.........................................................................................................................................................12
5.3. INPUT OF COLLECTIVE FAILURE:EXTI...............................................................................................................................13
5.4. INDICATION OF THE ENCLOSURE OPENING -TAMPER. .....................................................................................................13
5.5. PSU OVERLOAD.................................................................................................................................................................13
5.6. SHORT-CIRCUIT OF THE PSU OUTPUT. ...............................................................................................................................13
6. RESERVE POWER SUPPLY CIRCUIT...........................................................................................14
6.1. BATTERY DETECTION. .......................................................................................................................................................14
6.2. PROTECTION AGAINST SHORT-CIRCUIT OF THE BATTERY TERMINALS................................................................................14
6.3. PROTECTION AGAINST REVERSE BATTERY CONNECTION....................................................................................................14
6.4. DEEP DISCHARGE BATTERY PROTECTION UVP. .................................................................................................................14
6.5. BATTERY TEST...................................................................................................................................................................14
6.6. MEASUREMENT OF THE RESISTANCE OF THE BATTERY CIRCUIT.........................................................................................14
6.7. BATTERY TEMPERATURE MEASUREMENT. .........................................................................................................................14
6.8. STANDBY TIME. .................................................................................................................................................................15
7. TECHNICAL PARAMETERS. ..........................................................................................................16
Table 5. Electrical parameters.............................................................................................................................................16
Table 6. Mechanical parameters..........................................................................................................................................18
Table 7. Safety of use............................................................................................................................................................18
Table 8. Operation parameters. ...........................................................................................................................................18
Table 9. Recommended types and sections of installation cables. .......................................................................................18
8. TECHNICAL INSPECTIONS AND MAINTENANCE...................................................................19

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1. PSU features.
Compliant with the requirements of the
EN 54-4:1997+AC:1999+A1:2002+A2:2006,
EN 12101-10:2005+AC:2007
27,6 V DC uninterruptible power supply
available versions with 2 A / 5 A current
efficiencies
available versions with space for 7 Ah –65 Ah
batteries
independently protected outputs AUX1 and AUX2
high efficiency (up to 89%)
low level of voltage ripple
microprocessor-based automation system
measurement of the resistance of the battery
circuit
automatic temperature-compensated charging
automatic battery test
two-stage battery charging process
accelerated battery charging
monitoring of the continuity of the battery circuit
monitoring of the battery voltage
monitoring of charging and maintenance of the
batteries
deep discharge battery protection (UVP)
battery overcharge protection
the LoB low battery voltage indication
battery output protection against short-circuit
and reverse connection
output voltage control
fuse monitoring of AUX1 and AUX2 outputs
relay output of collective failure ALARM
EPS relay output indicating 230 V power loss
the EXTi input of external failure
protections:
SCP short-circuit protection
OLP overload protection
OVP overvoltage protection
Surge protection
Antisabotage protection –Tamper
closing the enclosure –lock
optical indication –LED panel
2. Functional requirements of the PSU.
The buffer power supplies for fire alarm systems has been designed in accordance with the following
standards:
- EN 54-4:1997+AC:1999+A1:2002+A2:2006 Fire detection and fire alarm systems
- EN 12101-10:2005+AC:2007 Smoke and heat control systems
Functional requirements
Requirements
according to
standards
Power supplies
EN54C series
Two independent power sources
YES
YES
EPS network failure indication
YES
YES
Two independent power supply outputs protected against short
circuits
YES
YES
Temperature compensation of the battery charging voltage
YES
YES
Measurement of the resistance of the battery circuit
YES
YES
LoB low battery voltage indication
YES
YES
Recharging battery to 80% of rated capacity within 24 hours
YES
YES
Protection against deep battery discharge
YES
YES
Protection against short-circuit at the battery terminals
YES
YES
Charging circuit failure Indication
YES
YES
Short-circuit protection
YES
YES
Overload protection
YES
YES
Output of collective failure ALARM
YES
YES
EPS technical output
YES
YES
Low output voltage indication
-
YES
High output voltage indication
-
YES
Power supply failure indication
-
YES
Protection against surges
-
YES
Input of external failure indication EXTi
-
YES
Tamper switch unwanted enclosure opening
-
YES

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3. Technical description.
3.1. General description.
The buffer power supplies has been designed for an uninterrupted supply of fire alarm systems, smoke
and heat control systems, fire protection equipment and fire automatics requiring stabilized voltage of 24 V DC
(±15%). The power supplies are fitted with two independently protected AUX1 and AUX2 outputs, which provide
a voltage of 27,6 V DC and the total current efficiency depending on the version:
Power supply model
Battery
Continuous operation
Imax a
Instantaneous
operation
Imax b
EN54C-2A17
17 / 18 Ah
1,2 A
2 A
EN54C-5A17
17 / 18 Ah
4,2 A
5 A
In case of power loss, the PSU switches to battery power, providing uninterruptible power supply.
The power supply unit is housed in a metal enclosure (color red RAL 3001) with space for battery.
Power supply units works with maintenance-free lead acid batteries made with AGM technology or gel
technology.
3.2. Block diagram.
Power supplies has been manufactured based on a high-efficiency system of AC/DC converter.
Applied microprocessor circuit is responsible for the full diagnostics of the PSU parameters and batteries.
Figure below shows a flowchart of the power supply, along with selected functional blocks which are
essential for the proper functioning of the unit.
Fig. 1. PSU block diagram.

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3.3. Description of components and power supply terminals.
Table 1. Elements of the PSU (Fig. 2).
Compone
nt No.
Description
230 V supply connector with a terminal for connection of a protective conductor
Terminals:
TEMP –input of the battery temperature sensor
TAMPER –input of the microswitch tamper
Closed input = no indication
Open input = alarm
ALARM –technical output of collective failure of the PSU - relay type
EPS –technical output of AC power failure indication
open = AC power failure
closed = AC power - O.K.
EXTi –external failure input
Closed input = no indication
Open input = alarm
+BAT- –terminals for connecting the battery
+AUX1- –AUX1 power output ( - AUX=GND)
+AUX2- –AUX2 power output ( - AUX=GND)
CAUTION! In Fig.2 the set of contacts shows a potential-free status of the relay, which corresponds to power
supply failure.
Fuses:
FBAT –fuse in the battery circuit,
FAUX1 –fuse in the AUX1 output circuit,
FAUX2 –fuse in the AUX2 output circuit,
The fuse values are given in table 4 –„Electrical parameters”.
LEDs –optical indication:
230 V AC –voltage in 230 V AC circuit
APS –battery failure
ALARM –collective failure
AUX1 –AUX1 output voltage (at the AUX1 connector)
AUX2 –AUX2 output voltage (at the AUX2 connector)
PANEL LED –connector to the external LED indicators
Battery temperature sensor
Battery connectors; positive: +BAT = red, negative: - BAT = black
Fig. 2. View of power supply module based on EN54C-2A.

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Table 2. Elements of the PSU (Fig. 3).
Component
No.
Description
PSU (Tab. 1, Fig. 2)
Battery temperature sensor
Battery connectors; positive: +BAT = red, negative: - BAT = black
A place for installation of additional modules
TAMPER; microswitch (contacts) of antisabotage protection (NC)
Fitting battery
Embossing for cable gland
Embossings for concealed wires
Lock
Fig. 3. View of power supply based on EN54C-2A.

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4. Installation.
4.1. Requirements.
PSU is to be mounted by a qualified installer, holding relevant permits and licenses (applicable and
required for a given country) to connect (interfere) with ~230 V mains supply.
As the power supply is designed for a continuous operation and is not equipped with a power-
switch, therefore, an appropriate overload protection in the power supply circuit should be provided. Moreover,
the user should be informed how to disconnect the power supply unit from the mains supply (usually by
assigning an appropriate fuse in the fuse box). One switch should only protect one power supply. The electrical
system shall follow valid standards and regulations. The power supply should operate in a vertical position in
order to provide free and convectional air flow through ventilating holes of the casing.
As the PSU cyclically runs a periodic battery test, during which the resistance in the battery circuit is
measured, pay attention to the proper connection of cables to the terminals. Installation cables should be firmly
connected to the battery side terminals and to the power supply connector. If necessary, it is possible to
permanently disconnect the battery from the power supply systems by removing the FBAT fuse.
The side walls of the housing include the embossings, which should be used to carry out installation
cables. Use a blunt instrument to make an opening for cable gland from the outside of the housing.
Then, carefully mount the cable gland, protecting the PSU from water penetration, in the opening.
Fig. 4. The method of forming an opening for cable gland.
The PSU is fitted with PG9 and PG11 cable glands. Gland size should be chosen depending on the
cross-section of the cable. Single cable gland can be used for only one wire.
Fig. 5. Recommended types and sections of installation cables PG9 and PG11 for cable glands.

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4.2. Installation procedure.
CAUTION!
Before installation, cut off the voltage in 230 V AC power-supply circuit.
To switch power off, use an external switch, in which distance between contacts of all poles in
disconnection state is not less than 3 mm.
It is required to install an installation switch with a nominal current of 6 A in the power supply circuits
outside the power supply unit.
1. Mount the PSU in a selected location with use of special metal expansion bolts. Do not use PVC
dowels.
2. Connect power cables ~230 V to L-N clips of PSU. Cable length inside housing should not exceed
10cm. Connect ground wire to terminal marked with grounding symbol in enclosure. Use a three-
core cable (with a yellow and green protection wire) to make connection. Wires should be deisolated to
a length of 7.2mm.
3.
Shock protection circuit shall be done with a particular care: yellow and green wire coat of power
cable should be connected to terminal marked with grounding symbol on PSU enclosure.
Operation of PSU without properly made and fully operational shock protection circuit is
UNACCEPTABLE! It can cause damage to equipment or an electric shock.
4. Connect the receivers’ cables to the AUX1 and AUX2 output terminals on the PSU board.
5. If needed, connect the cables from the devices to the technical inputs and outputs:
- ALARM; technical output of collective failure of the PSU
- EPS; technical output indication of 230 V power collapse
- EXTi; input of external failure
6. Install the batteries in a designated area of the enclosure (see Fig. 3).
Connect the batteries with the PSU paying special attention to the correct
polarity. Batteries must be connected in series using the special cable
(included). Attach the temperature sensor to any of the batteries with
mounting tape (included). Place the temperature sensor between the
batteries.
7. Switch on the ~230 V supply. The corresponding LEDs on the power supply PCB should be ON: 230 V
green and AUX1, AUX2.
8. Check the current consumption of the receivers, taking into account the battery charging current, so as
not to exceed the total current efficiency of the PSU (see section 3.1).
9. Once the tests are completed, close the enclosure.

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4.3. Procedure for checking the power supply at the place of installation.
1. Check indication displayed on front panel of power supply unit:
a) 230 V AC LED should remain lit to indicate presence of mains supply voltage.
b) AUX LED should remain lit to indicate the presence of supply voltage.
2. Check the output voltage after 230 V power failure.
a) Simulate the lack of 230 V mains voltage by disconnecting main circuit breaker.
b) 230 V AC LED should go out.
c) AUX LED should remain lit to indicate the presence of output voltage.
d) LED ALARM LED will start blinking.
e) EPS and ALARM technical outputs will change status into opposite after 10 s.
f) Turn on 230 V mains voltage again. Indication should return to initial status from point 1 after a few
seconds.
3. Check whether lack of continuity in the battery circuit is properly indicated.
a) During normal PSU operation (230 V mains voltage on), disconnect battery circuit by disconnecting FBAT
fuse.
b) Within 5 minutes the PSU will start signaling a failure in the battery circuit.
c) ALARM LED will start blinking.
d) ALARM technical output will change status into opposite.
e) Turn on FBAT fuse in the battery circuit again.
f) Power supply should return to normal operation, indicating initial status, within 5 minutes after battery
test is completed.