Power Supply Module - BeaconMedaes MEGA 2 Installation, Operation And Maintenance Instructions

Testing
Power Supply Assembly:
The power supply assembly converts AC
mains power to +5 and +24 volts DC. AC
mains power can be any value between
100 and 250 volts AC. In order to verify
power supply assembly is functioning
correctly, perform following procedure.
1. Loosen two front panel screws and
open alarm panel.
2. If no indicator lights or LED displays
are illuminated on front of alarm
panel, first verify internal fuse is
good (Figure 25). If fuse is good,
continue this procedure.
3. Using a digital volt meter, measure
DC voltage between black (-) and
orange (+) wires where power
supply harness plugs into
annunciator module (Figure 26).
When making measurements, do
not disconnect cable from
annunciator board. Insert meter
probes into back of white plastic
connector.
4. Verify DC voltage is 4.5 to 5.5 volts.
5. Measure voltage between black (-)
and red (+) wires.
6. Verify DC voltage is 22.0 to 26.0
volts.
7. If voltages above are not within
specification, verify correct AC input
power as follows:
WARNING:
RISK OF ELECTRIC SHOCK !
USE EXTREME CAUTION -
The remainder of this procedure requires removal
of the clear plastic power supply shield. Even if
fuse is removed, the high voltage input wiring
remains energized.
8. Remove four keps nuts and plastic
shield from power supply. Do not
disconnect wires from fuse holder or
harness from power supply.
9. Position plastic shield (wires
attached) so that power supply's AC
input connector is accessible.
10. Using a digital volt meter, measure
AC voltage between white (neutral)
and black (line) wires on back of
power supply connector (Figure 27).
Verify AC input voltage is 100 to 250
volts.
11. If AC input voltage is within
specification, replace power supply
assembly.
Internal fuse holder
Figure 25: Alarm Panel Internal Fuse
Part No. 6-847684-00 Rev. D01
43