EQUIPMENT: FIRECLASS PRECEPT EN
PUBLICATION: FIRECLASS PREC EN INST
ISSUE No. & DATE: 3 13/09/18
PAGE 11 of 30
9. C1632 16 Zone Expansion Board Features
Figure 11 – C1632 16 Zone Expansion Board
10. Power Supplies
The Precept EN 2, 4, 8 and 16 zone panels
produce dc power regulation directly on the C1627
motherboard. The Precept EN 32 zone panel has
an off-board power supply via a dedicated PCB
(C1652) contained within the enclosure of the fire
alarm panel.
For all panels, the output voltage is adjustable from
25V to 28.2V via a small trimmer potentiometer on
the PCB. As the output voltage is factory set
however, this should not be necessary.
10.1 Visual indications
The following visual indications are provided:
1) A green ‘Output - OK’ LED. This simply
denotes that power is being supplied to the
panel
2) A yellow ‘Batt/Charge Fault’ LED denoting any
one of the following conditions:
a) Battery or associated wiring disconnected
b) Battery fuse blown
c) Low Battery voltage (15.7V ±0.4V)
d) Battery and interconnection resistance is
equal to or higher than:
1Ω - 4-zone panels
1Ω - All repeaters
0.6Ω - 8/16-zone panels
0.35Ω - 32-zone panels
3) A yellow ‘Charger Fault’ LED (‘Internal Fault’
LED on the C1652 PSU board) indicating any
of the following:
a) A mains fault exists (see below)
b) Switching regulator or charger circuitry is
malfunctioning
c) Battery Fuse is blown
4) A yellow ‘Mains Fault’ LED. This indicates that
the mains voltage has failed or is less than the
required minimum for correct operation of the
power supply (80% of the rated voltage).
Note: Fault indications do not become active for a
minimum of 10 seconds after the fault has
occurred.
10.2 Battery Disconnect
1) The supply provides a battery disconnect
facility which disconnects the batteries when
the battery terminal voltage falls below 19.5V.
Connector for
motherboard
ribbon
Detection zone
terminals for
zones 17 - 32
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