Kentec Electronics K25000 Series Guide

Man-1128_K25400_series_Power_Supply_Manual_15 Page 1of 20
K25000 & KD25000 Series
Fire Alarm Power Supplies
Installation, Commissioning and
Operating Manual
Man-1128 Issue 15 October 2019

Man-1128_K25400_series_Power_Supply_Manual_15 Page 2of 20
Section Page
1. General ...................................................................................................................................3
2. Power Requirements .................................................................................................................3
2.1 Input/Output Electrical Ratings ................................................................................................................3
2.2 Fuse Ratings .........................................................................................................................................3
2.3 Batteries...............................................................................................................................................3
3. Installation............................................................................................................................... 4
3.1 Environmental Considerations .................................................................................................................4
3.2 Mounting ..............................................................................................................................................4
3.3 Connecting to the mains Input.................................................................................................................5
3.4 Connecting to the Outputs........................................................................................................6
3.4.1 Load Connections (Terminal Block)....................................................................................................6
3.4.2 Load Connections (Ribbon Cable)......................................................................................................6
3.4.3 Load connections (optional dual transmission path PCB fitted) ..............................................................7
3.4.5 Fault output contact connections.......................................................................................................8
3.4.6 Battery Connections ........................................................................................................................8
3.4.7 Disabling battery disconnected indication...........................................................................................9
3.4.8 Disabling earth fault indication .........................................................................................................9
4. Indicators .............................................................................................................................. 10
5. Commissioning ....................................................................................................................... 10
6. Maintenance........................................................................................................................... 11
7. Standby batteries ................................................................................................................... 11
Compatible batteries:.................................................................................................................. 11
8. Power Supply Unit Dimensional Drawings.................................................................................. 12
9. Temperature sensor mounting .................................................................................................. 14
10. Cabling ................................................................................................................................ 15
11. Mains Voltage Selection ......................................................................................................... 16

Man-1128_K25400_series_Power_Supply_Manual_15 Page 3of 20
1. General
The K25000 series are combined power supply and battery chargers designed to be used for fire alarm control and
indicating equipment complying with EN54-2 and EN54-4.
K25400 models are fitted with a 5.25A power supply and K25250 models are fitted with a 2.5A power supply.
To satisfy the requirement of clause 6.4 of EN54-4, for fire alarm Power Supply Equipment mounted in a separate
enclosure to the Control and Indicating Equipment, a separate interface (RPSM2) needs to be fitted inside the PSE
enclosure which provides two transmission paths between the PSE and the CIE to enable one transmission path to
continue to operate in the event of failure of the other.
This board is fitted to models with the KD prefix to the part number. The D denoting that the dual output board is
fitted.
2. Power Requirements
The K25000 series require a mains power supply of 230V or 110V AC.
The maximum input current is 3 Amps.
Mains frequency should be 50Hz or60Hz.
2.1 Input/Output Electrical Ratings
Input – 110V AC or 230V AC (selected by link inside the power supply unit)
Load output - 19V DC minimum, 30V DC maximum.
Maximum output current – KD25400 and K25400 models = 4 Amps + 1.25A for battery charging.
KD25250 and K25250 models = 2.5Amps + 1.0 A for battery charging.
Maximum ripple 1 Volt.
Imax a – Rated maximum output current which can be supplied continuously – K25400 models = 4A
K25250 models = 2.5A
Imax b – Rated maximum output current which can be supplied while battery charging is not required
K25400 models = 5A
K25250 models 3.5A.
Imin -Minimum output current for correct operation = 10mA
Ri max – Maximum series resistance in battery charging circuit before a fault is indicated = 1.0 ohms.
Battery charging output – KD25400 and K25400 models = 26.4 V DC (at 40 C) to 28.9 V DC (at -5 C) 1.25 Amps.
KD25250 and K25250 models = 26.4 V DC (at 40 C) to 28.9 V DC (at -5 C) 1.0 Amps.
Fault signals - Switched negative open collector (with respect to load positive) current limited 100mA max.
Mains fail
Battery disconnected (Low battery shutoff voltage - 19 V (+/- 1 volt))
Battery voltage low/Battery connection high impedance. Low battery voltage = 21 V +/- 1 volt
Earth fault
Charger fault (high output to battery)
Fail safe (any one of the above)
2.2 Fuse Ratings
Input fuse - F3A 250V TD 20mm. (Replace only with a fuses of the same type).
Load fuse - Self-resetting Polyfuse 5 Amp rated. (Not replaceable).
RPSM2 fuses- FF very fast acting 6.3A,. (Replace only with fuses of the same type).
2.3 Batteries
Rechargeable, sealed lead acid Yuasa NP or Powersonic equivalent. Maximum capacity 26 Ah for K2540015, 12Ah for K25250 models.
Maximum current consumption from battery – 7 Amps K25400 models, 5.5A for K25250 models.
Quiescent current in mains failure mode - 70 milliamps.

Man-1128_K25400_series_Power_Supply_Manual_15 Page 4of 20
3. Installation
This product should be installed, commissioned and maintained by trained service personnel in accordance with the
following:
(i) Regulations for electrical equipment in buildings specific to the country of use
(ii) Codes of practice
(iii) Statutory requirements
(iv) Any instructions specifically advised by the manufacturer
3.1 Environmental Considerations
The KD25000 and K25000 series power supplies are mounted in steel enclosures with an ingress protection rating of
IP30.The operating temperature range should not exceed -5°C to +40°C (±2°).Humidity levels should not exceed 95%
(non-condensing).
3.2 Mounting
The unit should be mounted on a dry, flat surface and in a level position such that the enclosure is not distorted.
Screws or bolts of a minimum of 5mm diameter and suitable wall fixings must be used to mount the enclosure in all
three or four mounting positions.
It should be positioned in an accessible place as agreed with the end user.
The unit should not be mounted in another enclosure or near sources of excessive heat.
Cables should be connected using suitable, metal 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 unit
The equipment is of Class1 construction so must be permanently and reliably connected to the fixed earth of the
installation.
The primary earth of the end use application must be permanently marked with the protective earth symbol (IEC415
No. 5017). A suitable primary disconnecting device must be provided in the end use application.
Battery and load connections must be considered for connection to SELV (safety extra low voltage) circuits only.
The maximum leakage current of the completed and installed equipment must not exceed 3.5mA.
C
L
218 218
300
K2540003 FIXING CENTRES
C
L
218 218
405
K2540015 FIXING CENTRES
333
462
K25400M3 FIXING CENTRES
C2
C
L
229
166 166
K25250M2 FIXING CENTES

Man-1128_K25400_series_Power_Supply_Manual_15 Page 5of 20
3.3 Connecting to the mains Input
Do not connect a mains supply unless the supply voltage matches that shown on the rating plate.
A minimum cable size of 0.75mm must be used. Maximum cable size is 4.0mm².
Fit the mains cable via a suitable 94HB flame rated cable gland via a knockout close to the power supply unit. Connect
the Neutral of the mains power supply to the terminal marked N, connect the Live of the mains power supply to the
terminal marked L and connect the earth to the terminal marked E.
The mains wiring should be as short as is practical with no excess lengths or larger loops and be separated from all
extra low voltage wiring such as 24V supply wiring and battery leads. Ensure that all wires are fitted into the terminals
without any exposed lengths or strands which may give rise to exposure to electrical shock.
This equipment is designed to be operated 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 as close to the unit as is practical.
If the earth terminal is the primary earth of the end use application then apply the earth symbol (IEC415 No.5017)
next to this terminal. Ensure that all screws in the earth terminal block (including those that are not used) are
tightened during installation.

Man-1128_K25400_series_Power_Supply_Manual_15 Page 6of 20
Pin 1
J5
3.4 Connecting to the Outputs
3.4.1 Load Connections (Terminal Block)
On K25000 units, two terminals are provided for
connection of the load. +24V DC and DC RETURN.
The load should be connected using wire rated for at
least 10 Amps continuous.
Care must be taken to connect the polarity of the
load the correct way around, + on the PSU to + on
the load and - on the PSU to - on the load.
Note: Maximum cable size is 2.5mm
A Wurth 742 711 31, clip on ferrite must be
fitted to the load cable before it exits the
enclosure. This is supplied.
3.4.2 Load Connections (Ribbon Cable)
An alternative method of connecting to the power supply is via a 14-way ribbon cable.
The ribbon cable must not leave the enclosure
A standard latching ribbon cable header is provided on the board, which may be used to connect to the load, and fault
signals. (See below.)
When used in the K25000 series boxed power supplies, the load connection terminals (detailed in 3.4.1 above) must
be used as the primary power connection.
The KD25400 series (dual output) power supplies use the ribbon cable connection to provide additional power and
fault connections to the dual output interface card.
When the power supply unit is integrated into some other Kentec products (for example the Syncro fire panel) the
ribbon connection may be the only power and fault connection between the power supply and the panel.
Pin 1 = Negative
Pin 2 = Negative
Pin 3 = Negative
Pin 3 = Negative
Pin 5 = Positive 24V
Pin 6 = Positive 24V
Pin 7 = Positive 24V
Pin 8 = Positive 24V
Pin 9 = Battery disconnected (switched –ve 100 milliamps max)
Pin 10 = Mains failed (switched –ve 100 milliamps max)
Pin 11 = Battery low/High impedance (switched –ve 100 milliamps max)
Pin 12 = Earth fault (switched –ve 100 milliamps max)
Pin 13 = Charger fault (switched –ve 100 milliamps max)
J5
24V
DC
DC
RTN
POSITIVE
NEGATIVE

Man-1128_K25400_series_Power_Supply_Manual_15 Page 7of 20
3.4.3 Load connections (optional dual transmission path PCB fitted)
When the power supply unit is being used to supply power to fire alarm control and indicating equipment, to comply
with the requirements of EN54-4, there must be two transmission paths from the power supply to the control panel in
order that a short or open circuit in one transmission path will enable the control panel to be supplied with power from
the other.
This is facilitated by the RPSM2 PCB which is mounted in the enclosure as standard on KD25000 models. The RPSM2
PCB has a common fault relay which signals any of the faults associated with the power supply including failure of one
of these transmission paths.
When connecting power to fire alarm control and indicating equipment, the connections OUT1 + and OUT1- should be
connected to one power input of the control and indicating equipment and the connections OUT2 + and OUT2- should
be connected to the other power input of the fire alarm control and indicating equipment.
Only fire alarm control and indicating equipment with two separated 24V DC inputs is compatible with these power
supply units.
Care must be taken to connect the polarity the correctly, + on the RPSM2 PCB to + on the control panel and - on the
RPSM2 PCB to - on the control panel.
The total load over the two outputs should not exceed 5 Amps on KD25400 and K25400 models and 3.5 Amps on
KD25250 and K25250 models.
Failure to connect the polarity correctly could result in damage to the control panel, the power supply or
both.
The common fault relay is normally energised and will operate to signal any fault associated with the power supply or
total power failure.
The fuses on the RPSM2 PCB must be replaced only with the correct type as described in section 2.2 of this manual.
Note: A Wurth 742 711 31, clip on ferrite must be fitted to each of the load cables before they exit the
enclosure. These are supplied.
F1
Q3
R6
D7
D11
D12
Q4 R4
D2
D1
F2
D6
R1 0
R8
D10
R3
Q1
D8
D3
R7
C4
D9
C3
RL1
X6
X3
X4
D4 Q2 X5
X1
X2
D5
C1 C2
M2
M1
LED2
LED1 R5
R9
+
NO
+
NC
OUT2 OUT1
IN
O/P2
O/P1
+
+
+
C
RPSM2A ISS.A
-
-
+
+
-
DUAL POWER PATHS TO
FIRE ALARM EQUIPMENT
O/P1 FUSE
O/P2 FUSE
O/P1 FUSE FAILED
O/P2 FUSE FAILED
INPUT FROM
POWER SUPPLY
RIBBON CABLE TO
INDICATORS
RIBBON CABLE FROM
POWER SUPPLY
COMMON FAULT RELAY

Man-1128_K25400_series_Power_Supply_Manual_15 Page 8of 20
3.4.5 Fault output contact connections
A volt free contact rated at 30V DC and 1 Amp is available
for connection to other systems.
This contact will operate upon any of the fault conditions
listed in section 4.
The contact positions shown here are with mains
and battery connected and with no fault conditions
on the power supply.
3.4.6 Battery Connections
Batteries of even very small capacity are capable of
delivering very high currents which can cause fire or
injury. Battery connections must therefore be made using
extreme caution.
As supplied, power supplies have battery leads already
wired to the battery terminals on the circuit board. These
leads are coloured red for + and black for – and are fitted
with standard ¼ inch push on, spade connectors suitable
for batteries of up to 12Ah capacity.
Larger capacity batteries have screw on terminals and the
standard battery leads will need to be replaced with the
ones supplied in the accessory pack. Take care that the
red and black wires are connected to the correct terminals when replacing battery leads, a wrong connection can be
dangerous and can cause damage.
As this is a 24-Volt system, there will be two 12 volt batteries which need to be connected in series. This is done using
the jumper link provided.
To optimise the service life of the batteries, the battery charger output voltage varies with temperature. To enable
optimum temperature compensation, the flying lead temperature sensor should be attached to one of the batteries as
shown in the diagram in section 9 of this manual.
J5
24V
DC
DC
RTN
NORMALLY OPEN
COMMONNORMALLY CLOSED

Man-1128_K25400_series_Power_Supply_Manual_15 Page 9of 20
J5
In order to correctly charge the batteries, the power supply must be matched to the type of batteries that are
connected to it.
This is done by setting the DIP switch located next to the ribbon cable connector J5. Switch 4 is to choose the battery
manufacturer (Yuasa or Powersonic). Switches 1,2 and 3 must be left in the OFF position.
3.4.7 Disabling battery disconnected indication
When the power supply is to be used without standby batteries, the battery disconnected warning indication and
operation of the common fault relay may be disabled by setting position 1 on the DIP switch to the ON position as
show in the diagram below.
In order to comply with the requirements of EN54-4 this switch setting must not be used when the power supply is
being used to power fire alarm detection and control equipment.
Battery disconnected
fault warning disabled =
4
3
2
1
3.4.8 Disabling earth fault indication
It is possible to disable the reporting of an earth connection to the 24V output or battery, by setting DIP switch 3 to
the ON position as shown below. This is not recommended during normal operation and could render the system
unsafe if two earth faults occur which short the 24V supply.
Earth fault
fault warning disabled =
4
3
2
1
In order to comply with the requirements of EN54-4 this switch setting must not be used when the power supply is
being used to power fire alarm detection and control equipment.
This feature is only available on power supplies manufactured from February 2016 onwards.
DIP switch
location
ON OFF
Powersonic=
Yuasa =
4
3
2
1
4
3
2
1

Man-1128_K25400_series_Power_Supply_Manual_15 Page 10 of 20
4. Indicators
The diagnostic indicators visible through the
case of the power supply indicate the status of
the unit as follows:
DC OUT ON – The 24V DC output is supplying
power to the load.
HEARTBEAT (flashing slowly) – The processor is
functioning normally.
BATTERY DISCONNECTED – The battery is
disconnected.
BATTERY LOW (no CHARGER FAULT) – The unit
is operating from battery and the battery
voltage is below 21 Volts. –or–The unit is
operating from mains power and the battery
voltage is below 24 Volts.
BATTERY LOW and CHARGER FAULT – The
battery impedance exceeds the acceptable
limit. (Install fresh batteries and ensure all
connections to the batteries are good)
CHARGER FAULT with abnormal HEARTBEAT –
An internal fault has been detected in the
power supply module. The HEARTBEAT
indicator flashes with different on/off ratio
patterns to indicate the fault.
1-1 Mains is on and 24V output is not in
regulation.
1-2 The battery voltage is higher than permitted limits
1-3 The battery charge current is higher than permitted limits
1-4 The battery charge current is low while the charger output current is
at the maximum limit
EARTH FAULT – The 24V DC output has a low resistance path to earth.
AC NORM – Mains power is connected.
5. Commissioning
Once all connections have been made and checked for safety, switch on the mains power. The load should now be
supplied with power and the batteries should be taking a charge. Check the load is being supplied at about 24 Volts
with a volt meter.
Check that the AC NORMAL LED is on.
Check that the HEARTBEAT LED is flashing slowly.
Check that the load is being supplied by observing the power on lamp on the load (control and indicating equipment).
Remove the mains power and ensure that the batteries continue to supply power to the load.
With the mains removed, the AC NORMAL indicator should be off.
Switch the mains back on and disconnect the battery. The load should continue to operate and the BATTERY DISCON.
LED should light after a short delay.
Connect the load + terminal to earth using a piece of wire. Within 30 seconds, the GROUND FAULT LED should light.
Disconnect the load + from earth and connect the load - to earth. Within 30 seconds, the GROUND FAULT LED should
light.
This completes the basic commissioning checks.
J5
AC NORM
EARTH FAULT
CHARGER FAULT
BATTERY LOW
BATTERY
DISCONNECTED
HEARTBEAT
DC OUT ON

Man-1128_K25400_series_Power_Supply_Manual_15 Page 11 of 20
6. Maintenance
The power supply requires no specific maintenance; however, sealed lead acid batteries have a limited lifespan and
should be checked periodically in accordance with the manufacturer’s recommendations and replaced as recommended
below.
The only replaceable parts are the mains fuses and fuses on the dual power output board RPSM2 on KD25000 models.
Should a fuse fail, the fuse must only be replaced with fuses of the same type as originally fitted. Spare fuses
are supplied in the accessory pack. Care must be taken to select the correct one when replacing fuses.
These are as follows:
Mains Input fuse - F3A 250V TD 20mm. (Replace only with fuses of the same type).
KD25000 series RPSM2 fuses- FF very fast acting 6.3A. (Replace only with fuses of the same type).
7. Standby batteries
Sealed lead acid batteries have an expected life of 3 to 5 years when operated at an ambient temperature of 20oC.
Batteries operating in temperatures higher than 20oC will have a significantly reduced life of approximately 50% for
every 10oC above 20oC.
This must be considered when determining the battery maintenance schedule and batteries consistently operating in
higher ambient temperatures should be replaced more frequently.
Batteries with a manufacturing date older than 6 months are not recommended for use with this equipment.
Sealed lead acid batteries can liberate hydrogen during normal use. The KD25000 and K25000 series of power
supplies have adequate ventilation to allow this hydrogen to disperse normally and safely therefore additional sealing
or mounting inside a sealed enclosure is prohibited.
Batteries contain hazardous substances and must be returned to the supplier or manufacturer for disposal.
Refer to battery manufacturers recommendations for further information.
Compatible batteries:
Model
Yuasa
Powersonic
K2540003
NP4-12, NP7-12, NP12-12
PS-1242, PS-1270, PS-12120
K2540015
NP4-12, NP7-12, NP12-12, NP-17-12, NP-24-12
PS-1242, PS-1270, PS-12120, PS-12170, PS-12260
K25400M3
NP4-12, NP7-12, NP12-12, NP12-17
PS-1242, PS-1270, PS-12120, PS-12170
K2525003
NP4-12, NP7-12, NP12-12
PS-1242, PS-1270, PS-12120
K25250M3
NP4-12, NP7-12, NP12-12
PS-1242, PS-1270, PS-12120
KD2540003
NP4-12, NP7-12, NP12-12
PS-1242, PS-1270, PS-12120
KD2540015
NP4-12, NP7-12, NP12-12, NP-17-12, NP-24-12
PS-1242, PS-1270, PS-12120, PS-12170, PS-12260
KD25400M3
NP4-12, NP7-12, NP12-12, NP12-17
PS-1242, PS-1270, PS-12120, PS-12170
KD2525003
NP4-12, NP7-12, NP12-12
PS-1242, PS-1270, PS-12120
KD25250M3
NP4-12, NP7-12, NP12-12
PS-1242, PS-1270, PS-12120

Man-1128_K25400_series_Power_Supply_Manual_15 Page 12 of 20
8. Power Supply Unit Dimensional Drawings
385mm
285mm
POWER ON
POWER FAULT
90mm
KD 25250M2,and KD25250M2
WT
385mm
520mm
POWER ON
POWER FAULT
110mm
KD25250M3, KD25400M3, K25250M3 and K25400M3

Man-1128_K25400_series_Power_Supply_Manual_15 Page 13 of 20
POWER ON
POWER FAULT
500mm
355mm
105mm
KD2540003, KD2525003, K2540003 and K2525003
POWER ON
POWER FAULT
500mm
400mm
190mm
KD2540015 and K2540015

Man-1128_K25400_series_Power_Supply_Manual_15 Page 14 of 20
9. Temperature sensor mounting
To achieve correct battery charging temperature compensation (essential for correct maintenance of batteries) the flying lead thermistor must be affixed to one of the batteries
using Scotch 27 Glass Cloth Electrical Tape or equivalent. A suitable piece of this tape is supplied holding the temperature sensor to the power supply chassis.
Remove tape holding temperature sensor to power supply chassis and use
it to fit the temperature sensor to one of the batteries roughly in the position
shown below
Top of battery Top of battery

Man-1128_K25400_series_Power_Supply_Manual_15 Page 15 of 20
10. Cabling
Mains
The Mains cable should be a minimum cable size of 0.75mm² and rated at 250V. A suitable primary disconnecting device
must be provided in the end use application. Maximum cable size is limited to 4mm².
Keep all mains wiring separate from the Extra Low Voltage (ELV) battery cables and power supply output cables
Extra Low voltage wiring
Cable for low voltage wiring should be a minimum size of 1.0mm2 and rated for at least 30V DC. Keep all Extra Low
voltage wiring separate from mains wiring
All cable entries to the enclosure must be via suitable cable terminating kits such as Pirelli AXT20SK or equivalent.
The earth or drain wire must be securely clamped to the cable gland as shown below or trapped between the lock nut
and the enclosure with a cut washer.
ENCLOSURE
PASS EARTH WIRE THROUGH
GROOVE IN CABLE GLAND AND
SECURE WITH LOCK NUT

Man-1128_K25400_series_Power_Supply_Manual_15 Page 16 of 20
11. Mains Voltage Selection
The K25000 series power supplies will be supplied as 240V input voltage selected as standard, but may be optionally
supplied as 110V if requested when the power supply was ordered.
The selected voltage of the power supply is clearly shown on the power supply cover.
In the unlikely event that the power supply input voltage needs to be changed, this may be performed by the addition
/ removal of a link on the power supply circuit board, using the following procedure.
Warning:
High voltages exist within the power supply unit. Ensure that the mains power is switched off and fully
isolated before working on the power supply.
1) Ensure that the mains power feed is disconnected and isolated from the power supply unit.
2) Disconnect and insulate the mains input cables from the power supply
3) Disconnect the battery leads from the standby batteries (if connected)
4) Carefully remove the 14 way ribbon cable connected to J5
5) Remove the cables from the 24V DC load terminals
6) Loosen the two M4 screws located on the fixing flanges on the right hand side of the power supply unit
7) Carefully remove the two M4 screws on the left side of the power supply unit, ensuring any washers & ring crimps
are kept safe. These screws are located in the top left corner of the power supply and between the battery lead
terminals and ribbon connector plug.
8) It should be possible to remove the power supply unit from the enclosure.
9) The cover of the power supply can now be removed by removing three small Posidriv screws / washers. Two of
these are located on the right side of the power supply, the other in the top left corner of the power supply cover. A
fourth screw located in the lower left of the power supply will also need to be removed before the cover can be
carefully lifted away.
10) With the cover removed it is possible to see the circuit board with the mains input voltage selection link position
11) Link J1 should be removed for 240V operation, fitted for 120V operation.
Take care to ensure that the correct selection for the mains input voltage is made, as damage may occur
to the power supply if the wrong mains voltage is applied.
12) Re-fit the power supply cover ensuring all four screws and washers are used.
13) Replace the power supply in the panel enclosure, ensuring all washers and earth bonding straps are correctly
installed
14) Replace the ribbon cable, load cable and mains / battery connections

Man-1128_K25400_series_Power_Supply_Manual_15 Page 17 of 20
15) Modify the input voltage selection on the power supply cover to show the correct input voltage for the power
supply
Note: When the power supply is removed from the panel enclosure, it is possible to view the link location on the
circuit board through an aperture in the outer cover at the top of the power supply.
Long nosed pliers may be used to carefully remove or place the link in the power supply board, rather than removing
and replacing the power supply cover.

Man-1128_K25400_series_Power_Supply_Manual_15 Page 18 of 20

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