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1 OPERATIONAL OVERVIEW
1-8
1.10 Power Supply Unit (option)
The control unit works directly 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-1570 or type PR-850A, supplying 24 VDC (40 A) to the FS-2570. 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-1570/FS-2570 can be operated directly from 24 VDC without a power supply.
OVEN power supply: The crystal oven is always powered even when the Power Switch
is OFF, provided the mains switchboard is turned on.
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 control unit may be turned on
or off with the PSU kept on.
POWER
ON
ON
OFF
AC INPUT 50/60Hz DC OUTPUT
Breaker
Power Lamp
Terminal
Cover
ON
OFF
100V 10A
220V 5A
ON
OFF
125V 20A
AC IN DC IN DC OUT
PR-300
LNG +- +- +-24V
Red Light Green Light
PR-300
PR-850A
Lamp (red): Lights when AC power source is in use.
Lamp (green): Lights when DC power source is in use
Power supply units
Note: Both lamps light when changing to DC power supply (PR-300). These lamps also
light when the internal temperature goes too high.