Man-1152_K25800_series_Power_Supply_Manual_05 Page 8 of 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
O
U
T
2
O
U
T
1
IN
O/P2
O/P1
C
RPSM2 ISS.03
-
-
+
+
-
F1
F2
TB6
2
1
3
TB
1
21
TB
6
2
1
TB
1
21
TB
6
2
1
TB
1
21
TB
6
2
1
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
