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1. Description
The FPN5590B is an AC-powered power supply unit for use with the MICOM-2 and MICOM-3
HF-SSB radio transceivers.
The FPN5590B accepts single-phase AC input voltages in the range of 85 to 265 VAC, 47 to 63
Hz, and therefore it can be used in the United States of America as well as in other countries. The AC
input voltages must be applied through an external 20 A slow-blow fuse.
The FPN5590B has an ON/OFF switch, and a green ON indicator that lights when the JWS600
provides normal output voltage.
The nominal output voltage is 13.8 VDC and the maximum output current is 43 A. A voltage
adjustment enables setting the output voltage within the range of 13.5 to 18.0 VDC. The output
voltage is factory set, and normally will not require adjustment.
Backup batteries (recommended capacity – 80 Ah lead acid) can be connected across its output:
when a backup battery is connected, the radio transceiver can continue operating on battery power
during mains failure or in case the FPN5590B is switched off.
The output is protected against excessive loading by current limiting with automatic recovery,
therefore the unit will not shut down when charging a battery, even if the battery voltage is low. It is
recommended to connect a 30 A fuse in series with the battery positive terminal.
The unit is also protected against overvoltage and overheating: in case one of these protections are
activated, FPN5590B will be automatically turned off. Set the unit ON/OFF switch to OFF, and wait
a few minutes or as necessary for the unit to cool off before returning the switch to ON.
FPN5590B uses internal forced air cooling. The direction of air flow, and the intake and exhaust
vents are identifed below, together with the minimum space required to sufficient airflow.
Minimum Free Space
50 mm
Minimum Free Space
50 mm
Airflow
Minimum Free Space
10 mm
To avoid overheating and excessive internal temperatures that may result in automatic switch-off, take
care that the unit is not covered, that no other equipment is placed above and that it is not operated
near a heater. Also avoid direct exposure to sun.
Note that the transceiver draws current from the battery even the transceiver is switched off.
Therefore, it is recommended to disconnect the transceiver from the battery if the radio is not used
for prolonged periods. The FPN5590B does not draw current from the battery upon switch off or
mains failure.
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