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the input is switched off. To reset this circuit input to the NAV-PAC must be
restored.
Bear in mind that the NAV-PAC has another disconnect circuit which may cause
it to shut down sooner. The battery is also protected by a low-voltage disconnect
circuit. Should the current draw of the device being powered cause the battery
voltage to drop to 10.2 VDC before 15 minutes have passed, then this circuit will
disconnect the battery from the output. The amount of time the equipment will
continue to function normally before the NAV-PAC will shut down will depend, in
this case, upon the current draw of the device being powered. (See BACK-UP
POWER in the SPECIFICATIONS section on page 8.) To reset this circuit, the
internal battery must be recharged. Reduce or shut off the electronic load, and
insure that an adequate charge voltage is restored to the input. (See BATTERY
CHARGING/REPLACEMENT.)
If you are unable to restore DC power immediately it is probably a good idea to turn
off the equipment being powered by the NAV-PAC. Most communication or
navigation equipment with built -in memory has a "keep alive" or "soft" shutdown
that is activated by the on/off switch. But if the input voltage is slowly reduced, as
will occur when the NAV-PAC battery discharges, this "keep alive" feature may not
activate, resulting in loss of memory, waypoints, etc.
REMEMBER: When you wish to shut off your com/nav equipment, you must shut
it off with the power switch to the equipment itself. Do not shut off the input to the
NAV-PAC. The NAV-PAC will simply treat this the same as an emergency loss
of DC input, and will continue to supply the comm/nav equipment with DC power
from its internal battery until auto-shutdown occurs.
If you are not powering equipment with the NAV-PAC and it is not being supplied
with DC input, it is recommended that you turn off the remote panel. Though the
current draw from the LED's is slight, it will unnecessarily drain the battery over
time if they are left on.
BATTERY CHARGING/REPLACEMENT:
CAUTION: DO NOT LEAVE THE BATTERY DISCHARGED FOR EXTENDED
PERIODS OF TIME. IT MAY BE PERMANENTLY DAMAGED AND MAY NOT
TAKE A RECHARGE.
The battery requires no maintenance and is completely sealed. Battery life is up
to five years. To charge the battery requires an input voltage of 13.8 to 14.8 VDC
for 3-4 hours or more per month. To prevent discharging requires a nominal input
of 13.4 - 14.4 VDC. These voltages are normally produced by an engine alternator
or good quality battery charger.
The battery storage time @ 23°C is 400 days. The battery should be replaced no
less frequently than every five (5) years to guarantee proper operation of the NAV-
PAC. (Request part #425-1204-0 )
To determine the age of the battery in your NAV-PAC, check the quality control
sticker on the end of the unit. The first four digits of the serial number (designated
"S/N") refer to the year and month of manufacture. For instance, a unit with a serial
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number starting "0435" was manufactured the 35th week of 2004, Be sure to
mark the date of replacement on this sticker for future reference.
BATTERY REPLACEMENT PROCEEDS AS FOLLOWS:
Caution: Take care to ensure that you do not short the battery terminals during
installation. The resulting high current can melt wires and cause other damage to
the unit.
1.
Turn off power to the input wiring and disconnect all input and output
connections to the NAV-PAC. Remove the unit from the mounting surface.
2.
Remove the fuse from the fuseholder labeled "BATTERY" on the front panel.
3.
Remove the four screws on the top of the unit and the four screws on either
side of the unit.
4.
Remove the cover.
5.
Disconnect the battery terminals.
6.
Remove the four screw / washer sets that are securing the battery hold-down
bracket.
7.
Slide the battery and bracket out from under the PCB.
8.
Slide the new battery and bracket into the NAV-PAC and reverse all above
procedures.
Dispose of the old battery properly and according to local codes. Although the
battery is sealed, it is a lead-acid type and there may be restrictions on its disposal.
TEST / TROUBLESHOOTING
To test the battery operation, disconnect the input power at the source or remove
the input fuse, and, using a voltmeter, note that DC output power is still present
on the output terminals. Note that after approximately 12-15 minutes the output
will disconnect automatically to protect the internal battery. You should then
measure no voltage on the output terminals. To reset this timed circuit, reconnect
the NAV-PAC input to the ship's battery.
The noise filtering and spike protection circuitry won't require testing unless the
NAV-PAC blows fuses repeatedly, or has had a nearby lightning strike, or other
very high energy transient.
If the NAV-PAC blow fuses repeatedly (replace with 20 Amp Fast Acting Fuse:
ABC-20 or AGC-20), this usually indicates a shorted component. Have a qualified
technician perform the repairs or return the unit to NEWMAR for factory inspection.
Always verify that the replaced fuses are of the correct rating. Use standard AGC
or fast-blow fuses. Do not use slow-blow fuses.
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