259 V/25 A
FRN, dual element
250 V/20 A
Emergency electrical system components are listed on the parts list of drawings listed in Appendix A and in
the Components of End Item List in TM 55-1930-209-14 & P-20.
Common and bulk items onboard are listed in the Expendable Supplies and Materials List in TM 55-1930-209-14 &
Repair parts and special tools onboard are listed in the Repair Parts and Special Tools List in TM 55-1930-209-14 &
Items required but not furnished. All required items are furnished.
Tools and test equipment. Use existing tools and equipment. A complete list of tools and test equipment
onboard is in the Tools and Test Equipment List in TM 55-1930-209-14 & P-1 8.
SECTION II. Description of operation
Description of operation
Normal operations. During normal operating conditions, when electrical power is available from either onboard
generators or shore power, circuit breaker 4P1 3 on power panel 3 (120 Vac) (Figure 2-5) provides power to the battery
charger. Charger, located in workshop, keeps battery bank on deckhouse top at full charge. Circuit breaker 1 OPI 3, using
normal power, provides a holding voltage to one side of inverter to keep inverter inoperative in normal operating mode. This
circuit breaker also provides 120 Vac to emergency lighting panel. During normal operations, the battery bank provides 24
Vdc to the other side of inverter. It also provides 24 Vdc to DC power panel for operating army radio, telephone system,
bilge alarm module, emergency shutdown system, and navigation and status lights.
Emergency operations. When normal electrical sources fail (or when circuit breaker 1OP13 is open), holding
voltage on output side of inverter drops out. Inverter becomes active with 24 Vdc coming from battery bank and 120 Vac
going to emergency lighting panel. This panel provides power to fluorescent lights in deckhouse and voids, marine radio,
and telephone station buzzers. Battery bank continues to supply 24 Vdc electricity to DC panel in workshop for operating
circuits listed in paragraph above. If battery bank is at full charge, it provides emergency electricity, depending upon power
load, for about 5 hours.