Restoration of normal source of electricity. When normal power is restored, 120 Vac electricity flows to output
side of inverter. Inverter ceases to operate, and 120 Vac, from normal power source, provides power directs b to emergency
lighting panel. The 120 Vac also flows to battery charger, which recharges battery bank Battery bank continues to provide 24
Vdc to DC power panel.
SECTION III. Operating Instructions
Operating controls and Indicators
The 24 Vdc power panel in workshop contains eight circuit breakers and one used circuit (Figure 3-2).
Emergency lighting panel, in ROWPU space on forward bulkhead, contains eight circuit breakers (Figure
Battery charger in workshop (Figure 3-4) has HIGHFFLOAT switch on panel. HIGH setting activates fast
charging circuit in charger. FLOAT setting activates slower charging circuit than HIGH setting and maintains
charge in battery at all times. FLOAT is normal setting. When activating system after a shutdown of more than
3 days, set on HIGH for not more than 24 hours.
Battery charger panel displays a DC ammeter and DC voltmeter (Figure 3-4) that indicate charging rate and
Battery charger panel has ON/OFF switch that turns charger on or off.
Battery charger panel has RESET button. When pressed it resets internal Circuit breakers on AC input and DC
output circuits. Prior to resetting, troubleshoot emergency system to determine why circuit breakers were
Inverter in workshop has ON/OFF switch that turns inverter on or off.
Prestart checks. Before energizing emergency electrical system, perform following before operation preventive
Fumes from batteries may be flammable and explosive. Do NOT smoke or have open flame when checking
or working on battery bank.
Battery electrolyte presents potential health hazards. Contact with eyes and skin should be avoided. Safety
glasses, gloves, and rubber aprons must be worn when handling this chemical. Electrolyte contains sulfuric
add, which can cause severe bums, and Is highly toxic to skin, eyes, and respiratory system.
Check batteries (Figure 3-5) for proper electrolyte level. Add distilled water or dean water to bring level above
Check that battery bank is secure and that electrical cable fittings are tight and coated with anti corrosion
grease. Correct as necessary.
Check major components (inverter, battery charger, battery bank 120 Vac emergency panel, and DC panel) for
damage and loose fittings or wires. Correct as necessary.
Clean major components as necessary.
Make sure that inverter switch is OFF.
Make sure all circuit breakers on 120 Vac emergency panel and 24 Vdc panel are open.