10)
Re-install cover, fuses, 24 volt output and input connections,
and verify equipment receives 24 volt power.
11)
See paragraph 1 of “Test/Troubleshooting” section to
verify back-up power operation.
Dispose of the old batteries properly and according to local
codes. Although the batteries are sealed, they are a lead-
acid type and there maybe 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 the DC output power is still present on the output
terminals. Note that after approximately 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/vehicle’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 qith 15 Amp
Fast Acting Fuse: ABC-15), 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 or fast-blow fuses. Do not use slow-blow fuses.
Theory of NAV-PAC Operation
Noise Filter/Voltage Transient Protector with Battery Back-Up
The NAV-PAC is wired in series with the DC power to sensiitive
electronics and:
1) Filters out noise interference on incoming power lines
2) Clamps voltage spikes and transients to a safe level
3) Provides battery back-up power during votlage drops due
to starter motors and momentary losses of power.
Specifications
Input:
24 VDC, Nominal Charging: 27.6-28.8VDC
To Prevent
Discharge: 26.8-28.8 VDC, Maximum 31.0 VDC
Output:
Filtered, Voltage Spike Protected with
Back-UP Battery 15 amps max
Back-Up Power:
24 VDC Nominal
5.0 AH Capacity
8 amps for Fifteen (15) Minutes
12 amps for Eight (8) Minutes
15 amps for Two (2) Minutes
Battery:
Sealed Rechargeable Lead-Acid 5.0 AH,
5 Years
Typical Life - Replaceable
Filtering:
Audio Through 200 MHz
Voltage Spike Protection:
Transient Energy Capability; 100 Joules,
4,000 amps Max.
Operating Temperature:
0-50° C
Size/Weight:
6” H x 6.75” W x 7.5” D; 8 Lbs.
13.3 H x 17.14 W x 19 D (cm); 3.6 Kgs.
Series Jumper Wire
Bracket with
Insulator Pads
+24V Battery RED
-24v Battery BLACK
5)
Remove Batteries
4)
Slide bracket forward along
battery then pull up
1)
Disconnect battery
terminals
3)
Loosen rear bracket screws
2)
Remove front bracket screws
Figure 1 & 2: Battery Replacement
Procedure
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