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-1.4-
1.3 Power Supply Unit
The transceiver unit FS-1562-15 or FS-1562-25 works direct on 24 VDC or through a Power
Supply Unit on AC mains supply (115 or 230 VAC). The power supply unit is type PR-300
supplying 24 VDC power (20 A) to the FS-1562-15 (150 W) Transceiver Unit or type PR-850A,
supplying 24 VDC (40 A) for the FS-1562-25 (250 W). Both 115/230 VAC and 24 VDC power
can be connected simultaneously. In this case, the system normally operates on the AC mains
supply and when AC power is lost, the PSU automatically switches to the DC power source.
This power supply arrangement satisfies the GMDSS requirements. The FS-1562-15/25 can be
operated direct from 24 VDC without a rectifier unit.
OVEN power supply: The crystal oven is always powered even when the Power Switch is
OFF. It draws 50 mA approx. The Oven LED lights while the oven is powered.
AC and DC power switches
Both AC and DC power switches on the PSU can be always kept “on”. (These switches are
provided to turn off the power supply for maintenance.) The transceiver may be turned on or off
with the PSU kept on.
ON
OFF
100V 10A
220V 5A
ON
OFF
125V 20A
AC IN DC IN DC OUT
PR-300
LNG + - +- + -24V
RED LIGHT GREEN LIGHT
POWER
ON
ON
OFF
AC INPUT 50/60Hz DC OUTPUT
BREAKER POWER LAMP
TERMINAL COVER
FRONT PANEL OF PR-300 FRONT PANEL OF PR-850A
Lamp (red): Lights when AC power source is in use.
Lamp (green) Lights when DC power source is in use.
NOTE: Both lamps light when changing to DC power supply (PR-300). These lamps also light
when the internal temperature excessively rises. The PR-300 or PR-850A is not required on 24
VDC vessels.
Fuses
The PR-300 has 2 fuses, each for AC and DC power.
100-120 VAC: 10 A
200-240 VAC: 5 A
DC fuse: 20 A
The PR-850A has a breaker and a power lamp on the front panel. The fuse is provided in the
power cable.
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