EQUIPMENT: FIRECLASS DUO-CEL
PUBLICATION: OM_DUO-CEL_APP
ISSUE No. & DATE: 2 20/06/18
PAGE 14 of 46
internal resistance. A PSU fault will be raised if
high resistance is detected. This test involves
loading the batteries so a battery load test is
also performed.
6.1.5 Visual indications
The Power Supply Unit has only one green LED.
This indicates that there is power available on the
output of the power supply.
6.1.6 Fault Conditions
The yellow fault wire from the PSU is normally at
27Vdc (nominal). The panel monitors this signal
and indicates a PSU fault if the voltage is removed.
6.2 Mechanical Protection
Warning:
The power supply uses hazardous voltages.
The unit is fitted with a protective cage to
protect service engineers from electrical shock.
Do not attempt to open or access any of the
internal components. The power supply
contains no user serviceable parts.
To prevent overheating, the ventilation holes in
the cage must not be obscured.
6.2.1 DUO-CEL Power Supply Features
and Connections
Figure 5 shows the layout of the BAQ35T24 Power
Supply.
Figure 5 – BAQ35T24 1.5A Power Supply Layout
TB2
VR1
NTC
+V
GND
B-
L
B+
Power
Connection to
Control Board
Incoming Mains
Cable
Secured with a
cable tie to the
backbox
Earth Wire to
EARTH bar
+V
ADJ
- +
DC OUT
27V
1.5A Power
Supply Unit
230VAC IN
N L
THERMISTOR
DC OUT
TO PANEL
Power
Connection to
Control Board
Thermistor
Connection to
Control Board
Leave the
Earth wire 3cm
longer than the
Live & Neutral
wires
Negative
Temperature
Coefficient
Thermistor Input
Connector.
Earth Wire to
Control Board
Mounting
Screw
NOTE: The black wire may be connected to (B-) instead of (GND) on the PSU. This is quite normal and does
not affect the operation of the PSU in any way.
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