Kentec Electronics K25800 Series Guide

Man-1152_K25800_series_Power_Supply_Manual_05 Page 1of 18
*This denotes variants tested & approved by the LPCB
K25800 & KD25800 Series
Fire Alarm Power Supplies
Installation, Commissioning and
O
p
eratin
g
Manual
Man-1152 Issue 05 July 2016

Man-1152_K25800_series_Power_Supply_Manual_05 Page 2of 18
*This denotes variants tested & approved by the LPCB
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 ............................................................................................................................3
3.1 Environmental Considerations .................................................................................................................3
3.2 Mounting ..............................................................................................................................................4
3.3 Connecting to the mains Input.................................................................................................................5
4. Connecting to the Outputs .......................................................................................................6
4.1 Load Connections (Terminal Block) ..........................................................................................................6
4.2 Load Connections (Ribbon Cable).............................................................................................................7
4.3 Load connections (with optional dual transmission path PCB fitted)..............................................................8
4.4 Fault output contact connections..............................................................................................................9
4.5 Battery Connections...............................................................................................................................9
5. DIP switch settings ............................................................................................................... 10
5.1 Disabling battery disconnected indication................................................................................................10
5.2 Disabling the battery impedance test .....................................................................................................10
5.3 Disabling earth fault indication ..............................................................................................................10
6. Indicators............................................................................................................................ 11
9. Standby batteries ................................................................................................................. 12
9.1 Compatible batteries ............................................................................................................................12
10. Power Supply Unit Dimensional Drawings .............................................................................. 13
11. Temperature Sensor Mounting ..............................................................................................15
12. Cabling..............................................................................................................................17

Man-1152_K25800_series_Power_Supply_Manual_05 Page 3of 18
*This denotes variants tested & approved by the LPCB
1. General
The KD25800 and K25800 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.
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 KD25800 and K25800 series power supplies are designed to operate from mains power supplies of 115V AC or
230V AC.
The maximum input current is 5 Amps.
Mains frequency should be 50Hz or 60Hz.
2.1 Input/Output Electrical Ratings
Mains Input – 115V AC – 230V AC.
Load output voltage -19V DC minimum, 30V DC maximum.
Load output current – 10.25A maximum.
Maximum ripple voltage - 1 Volt.
Imax a – Rated maximum output current which can be supplied continuously – 8A
Imax b – Rated maximum output current which can be supplied while battery charging is not required – 10.25A
Imin - Minimum output current for correct operation = 10mA
Ri max – Maximum series resistance in battery charging circuit before a fault is indicated = 0.4 ohms.
Battery charging output voltage–26.4 V DC (at 40 C) to 28.9 V DC (at -5 C)
Battery charging current - 2.25 Amps maximum.
Fault signals - Switched negative open collector (with respect to load positive) current limited 100mA max and
common volt free relay contact.
Battery disconnected (Low battery shutoff voltage - 19 V (+/- 1 volt))
Mains fail
Battery voltage low/Battery connection high impedance. Low battery voltage = 21 V +/- 1 volt
Earth fault
Charger fault
2.2 Fuse Ratings
Input fuse - F5A 250V TD 20mm. (Replace only with a fuses of the same type).
Load fuse - Self-resetting Polyfuse 10 Amp rated. (Not replaceable).
RPSM2 fuses- FF very fast acting 12A, (Replace only with fuses of the same type).
2.3 Batteries
Rechargeable, sealed lead acid Yuasa NP* or Powersonic*. Maximum capacity 45 Ah.
Maximum current drawn from batteries when mains is disconnected – 11 Amps
Quiescent current in mains failure mode - 50 milliamps.
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
Only fire rated and shielded cable should be used.
Note: For LPCB approved installations use only FP200*, 1.5mm2 2 core cable.
3.1 Environmental Considerations
The KD25800 and K25800 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).

Man-1152_K25800_series_Power_Supply_Manual_05 Page 4of 18
*This denotes variants tested & approved by the LPCB
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 40mm long wall fixings must be used to mount the
enclosure in all 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
K25800 03/KD25800 03 FIXING CENTRES
C
L
218 218
405
K25800 15/KD25800 15 FIXING CENTRES
333
462
K25800 M3/KD25800 M3 AND K25800 D3/KD25800 D3 FIXING CENTRES

Man-1152_K25800_series_Power_Supply_Manual_05 Page 5of 18
*This denotes variants tested & approved by the LPCB
3.3 Connecting to the mains Input
A minimum cable size of 1.0mm² must be used. Maximum cable size is 4.0mm². The mains cable should be
rated at 250V and fused via a 5A anti-surge fuse.
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 or 120V 60Hz 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.
A readily accessible, double pole disconnect device meeting the requirements of EN60950/IEC950 which disconnects
live and neutral simultaneously must 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.
RPSM2A
MAINS IN

Man-1152_K25800_series_Power_Supply_Manual_05 Page 6of 18
*This denotes variants tested & approved by the LPCB
4. Connecting to the Outputs
4.1 Load Connections (Terminal Block)
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
TB5
L5
F3 J1
FB5 FB7
C23
Q8
Q4
Q3
TB1
D9
QH3 C3
FB6
R13
TB6
L3
SW1
D17 D1
TB3
C10
Q5
J2
K2
C2
FB3
FB4 Q26Q6
C81
C19
D15
C17
C93
C16
C24
L6
C5
L7
F2
F1
C8
HS1
J5
R163
FB1
T4
C82
RV1
FB2
L10
C28
L8L9
C26
Q1
L17
R9
L1
L2 C1
L4
R109
F4
T2
D12 D28 Q2
K4
21
3
GND
1
+
YR
2
VOLTAGE B
S408
OUTON
+
+
DC
HIGH
+
N
BEAT
+
ISS.07
2
DISCON
1
250V, 5A, SB, 5X20MM
L
+
14
BAT
13
1
AREA
2
HOST I/F
+
NC C NO
GE N T BL
HRT
BAT
FLT
LOW
BATT
-
AC
+
FLT
RTN24V
NORM
GEN
+
+
slotsl ot
slot
TB6
21
TB6
21
Positive
Negative
Load connections to terminal block
Ribbon cable connections
Fault relay
When supplying high load currents such as the K25800 series of power supplies are capable of, volt drop in cables
should be considered.
Larger cables have less volt drop, so if long cables are being used to supply high currents then these should be larger
such as 2.5mm2, rather than 1.0mm2or 1.5mm2.
As an example, the volt drop with an 8A load for 50 metres of 1.0mm2cable would be about 14 Volts, which means
that there would be only about 10 Volts at the load end of the cable.
The volt drop with an 8A load for 50 metres of 2.5mm2cable would be about 6 Volts, which means there would be
about 18 Volts at the load end of the cable.
Cables and connectors should be suitably sized to ensure that the maximum current that can be supplied
by the power supply can safely be passed to the load without any risk of overheating or damage.

Man-1152_K25800_series_Power_Supply_Manual_05 Page 7of 18
*This denotes variants tested & approved by the LPCB
4.2 Load Connections (Ribbon Cable)
An additional 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.)
The ribbon cable should not be used alone for load power but always in conjunction with connections to
the load terminals 24V DC and DC RTN as described in 3.4.1 above.
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
Pin 10 = Mains failed
Pin 11 = Battery low/High impedance
Pin 12 = Earth fault
Pin 13 = Charger fault
Note: pins 9 to 13 switches –ve with respect to Positive 24V and can supply a
maximum of 100 milliam
p
s
p
er out
p
ut.

Man-1152_K25800_series_Power_Supply_Manual_05 Page 8of 18
*This denotes variants tested & approved by the LPCB
4.3 Load connections (with 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 KD25800 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 8 Amps (Imax a) or 10.25 Amps (Imax b).
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.
NO
+
NC
OUT2OUT1
IN
O/P2
O/P1
C
RPSM2 ISS.03
-
-
+
+
-
F1
F2
TB6
21 3
TB1
21
TB6
21
TB1
21
TB6
21
TB1
21
TB6
21
Input from power supply
Ribbon cable from power supply
Common fault relay
Ribbon cable to indicators
Dual power paths to fire alarm equipment
Fuse failure indicators
Fuses

Man-1152_K25800_series_Power_Supply_Manual_05 Page 9of 18
*This denotes variants tested & approved by the LPCB
4.4 Fault output contact connections
A volt free contact rated at 30V DC and 1 Amp (GEN FLT) is available for connection to other systems.
This contact will operate upon any of the fault conditions listed in section 4 as well as total power failure.
The contact positions on the common fault relay terminals shown are with mains and battery connected
and with no fault conditions on the power supply.
KD25800 models K25800 models
slotslo
t
4.5 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 11 of this manual.

Man-1152_K25800_series_Power_Supply_Manual_05 Page 10 of 18
*This denotes variants tested & approved by the LPCB
5. DIP switch settings
In order to correctly charge the batteries, the power supply must be matched to the
manufacturer type and size of batteries that are connected to it.
This is done by setting the DIP switch located next to the battery connection.
Switch 4 defines the battery manufacturer (Yuasa or Powersonic).
Switch 3 sets the size of battery, ON for batteries smaller than 18Ah and OFF for
batteries of 18Ah or larger.
The combination of switches 1 and 2 allow the power supply to be set to a special
mode for factory testing or to disable battery monitoring functions.
5.1 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 switch 1 on the DIP switch to the ON position, switch 3
to the ON position and switch 4 to the OFF position.
5.2 Disabling the battery impedance test
It is possible to disable the battery impedance test and fault reporting by setting switch 1 to the ON position, switch 3
to the OFF position.
5.3 Disabling earth fault indication
In applications where the output cannot be isolated from earth, the earth fault warning indication and subsequent
operation of the common fault relay may be disabled by setting switch 1 to the ON position, switch 2 to the OFF
position, switch 3 to the ON position and switch 4 to the ON position. (August 2016 onwards).
In order to comply with the requirements of EN54-4, switch 1 must be OFF and switch 2 must be ON.
No other setting must be used when the power supply is being used to power fire alarm detection and
control equipment.
TB5
L5
F3 J1
FB5 FB7
C23
Q8
Q4
Q3
TB1
D9
QH3 C3
FB6
R13
TB6
L3
SW1
D17 D1
TB3
C10
Q5
J2
K2
C2
FB3
FB4 Q26Q6
C81
C19
D15
C17
C93
C16
C24
L6
C5
L7
F2
F1
C8
HS1
J5
R163
FB1
T4
C82
RV1
FB2
L10
C28
L8
L9
C26
Q1
L17
R9
L1
L2 C1
L4
R109
F4
T2
D12 D28 Q2
K4
21
3
GND
1
+
YR
2
VOLTAGE B
S408
OUTON
+
+
DC
HIGH
+
N
BEAT
+
ISS.07
2
DISCON
1
250V, 5A, SB, 5X20MM
L
+
14
BAT
13
1
AREA
2
HOST I/F
+
NC C NO
GEN TBL
HRT
BAT
FLT
LOW
BATT
-
AC
+
FLT
RTN24V
NORM
GEN
+
+
slotslot
slot
TB6
21
TB6
21
DIP switch
OFF ON
4
3
2
1
SWITCH 3 ON = BATTERIES LESS THAN 18Ah
SWITCH 3 OFF = BATTERIES 18Ah AND OVER
SWITCH 4 ON = POWERSONIC
SWITCH 4 OFF = YUASA
DO NOT CHANGE

Man-1152_K25800_series_Power_Supply_Manual_05 Page 11 of 18
*This denotes variants tested & approved by the LPCB
6. Indicators
The diagnostic indicators visible along the edge of the power supply indicate the status of the unit as follows:
AC Normal – Mains power is connected.
Heartbeat (flashing slowly) – The processor is functioning normally.
DC Out on – The 24V DC output is supplying power to the load.
General fault – The battery charge voltage is too high
Earth fault – The 24V DC supply is connected to earth.
Battery low – The battery voltage is below 21 Volts.
Battery disconnected – The battery is disconnected or the charging circuit has
reached higher impedance than it should.
7. Commissioning
Once all connections have been made and checked for safety, ensure that batteries are correctly connected and switch
on the mains power.
Check that the AC Normal LED is on.
Check that the Heartbeat LED is flashing slowly.
Check that power is being supplied to the load with a volt meter. A voltage of 24V +/- 1V should be read.
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 switch off after approximately 30 seconds.
Switch the mains back on and disconnect the battery. The load should continue to operate and the Battery
disconnected LED should light.
This completes the basic commissioning checks.
Q4
C19
C93
RV1
L17
R109
T2
GND
OUTON
DC
BEAT
DISCON
BAT
HRT
BAT
FLT
LOW
AC
FLT
NORM
GEN
+
slot slot
slot
AC Normal
Heartbeat
General fault
DC Out on
Earth fault
Battery low
Battery disconnected

Man-1152_K25800_series_Power_Supply_Manual_05 Page 12 of 18
*This denotes variants tested & approved by the LPCB
8. 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 KD25800 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 – F5A 250V TD 20mm. (Replace only with fuses of the same type).
KD25800 series RPSM2 fuses- FF very fast acting 12A. (Replace only with fuses of the same type).
9. 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 KD25800 and K25800 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.
9.1 Compatible batteries
Model Yuasa Powersonic
K25800 03 NP4-12, NP7-12, NP12-12, NP-17-12,
NP18-12B PS-1242, PS-1270, PS-12120, PS-12170
K25800 15 NP4-12, NP7-12, NP12-12, NP-17-12, NP-24-12
NP18-12B, NP38-12I PS-1242, PS-1270, PS-12120, PS-12170, PS-12260, PS-12450
K25800 M3 NP4-12, NP7-12, NP12-12, NP-17-12,
NP18-12B* PS-1242, PS-1270, PS-12120, PS-12170*
K25800 D3 NP4-12, NP7-12, NP12-12, NP-17-12,
NP18-12B, NP-24-12, NP-38-12, NP38-12I PS-1242, PS-1270, PS-12120, PS-12170, PS-12260, PS-12450
KD25800 03 NP4-12, NP7-12, NP12-12, NP-17-12,
NP18-12B PS-1242, PS-1270, PS-12120, PS-12170
KD25800 15 NP4-12, NP7-12, NP12-12, NP-17-12,
NP18-12B, NP-24-12, NP38-12I* PS-1242, PS-1270, PS-12120, PS-12170, PS-12260, PS-12450*
KD25800 M3 NP4-12, NP7-12, NP12-12, NP-17-12,
NP18-12B PS-1242, PS-1270, PS-12120, PS-12170
KD25800 D3 NP4-12, NP7-12, NP12-12, NP-17-12,
NP18-12B, NP-24-12, NP-38-12, NP38-12I PS-1242, PS-1270, PS-12120, PS-12170, PS-12260, PS-12450

Man-1152_K25800_series_Power_Supply_Manual_05 Page 13 of 18
*This denotes variants tested & approved by the LPCB
10. Power Supply Unit Dimensional Drawings

Man-1152_K25800_series_Power_Supply_Manual_05 Page 14 of 18
*This denotes variants tested & approved by the LPCB
POWER ON
POWER FAULT
WT
385mm
520mm
POWER ON
POWER FAULT
110mm
K25800 M3 AND KD25800 M3

Man-1152_K25800_series_Power_Supply_Manual_05 Page 15 of 18
*This denotes variants tested & approved by the LPCB
11. 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.
KD25800M3, K25800M3, KD25800D3 and K25800D3 sensor mounting position.
C2
230V
BATTERY
BATTERY
Fit temperature
sensor here
KD2580003 AND K2580003 sensor mounting position
17 A/HBATTERY 17 A/HBATTERY
RP SM2A

Man-1152_K25800_series_Power_Supply_Manual_05 Page 16 of 18
*This denotes variants tested & approved by the LPCB
KD2580014 and K2580015 sensor mounting position.
RPSM2A
230V
BATTERY
BATTERY
Fit temperature
sensor here

Man-1152_K25800_series_Power_Supply_Manual_05 Page 17 of 18
*This denotes variants tested & approved by the LPCB
12. Cabling
Only fire rated and shielded cable should be used.
Note: For LPCB approved installations use only FP200*, 1.5mm2 2 core cable.
Mains
The Mains cable should be a minimum cable size of 1mm² 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.

Man-1152_K25800_series_Power_Supply_Manual_05 Page 18 of 18
*This denotes variants tested & approved by the LPCB
Fit supplied ferrites by looping the cores of (not the outer sheath) the load output cables and cable connected to fault
contact once through the ferrite as shown below.
For versions fitted with dual power output
For versions not fitted with dual power output
RPSM2A
MAINS INFAULTLOAD