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2.58.2 Battery. A 24-volt dc 9.5 ampere hour battery provides secondary or emergency dc power. The sealed lead acid battery (SLAB) is in the cabin section below the .oor panel accessable from the exterior of the aircraft. It supplies dc power to the battery bus, the battery utility bus and the dc essential bus (Figure 2-172-19) for operating dc essen-
tial equipment during primary dc malfunction. Power to the battery bus is controlled by the BATT switch on the upper console. It has marked positions OFF and ON. The battery utility bus is connected directly to the battery. The battery powers the dc essential bus when both converters have failed. When only battery power is available, the battery life is about 38 minutes day and 24 minutes night for a battery 80% charged. The BATT switch should be ON when either external power, APU generator or main gen-erator power is applied to the helicopter. This will recharge the battery. When the battery is the sole source of dc power, the BATT switch should be turned OFF immediately upon obtaining a BATT LOW CHARGE caution legend to con-serve battery power for APU starts. A malfunction of both dc primary sources will light caution legends marked #1 and #2 CONV.Ifthe BATT switch is left ON, the battery will be completely discharged in less than 6.0 hours. Power to light the caution legend is from the battery bus through a circuit breaker marked BATT & ESNTL DC WARN EXT PWR CONTR.
2.58.3 Battery Low Sensing Relay. The system charges the battery through the battery charging relay with one or both converters on. A caution legend indicating BATT LOW CHARGE lights when the battery charge lowers to 22.7 volts 6 2%. At this capacity the battery can provide two APU starts.
2.58.4 DC and AC Circuit Breaker Panels. The cir-cuit breaker panels (Figure 2-18) protect the power sys-
tems. One is above and to the rear of each pilot and copilot, one is on the lower console, and two are on the upper console , an auxiliary circuit breaker panel is located on the copilot’s side of the upper console, a mission readiness panel is located in the cabin area above the left window and there is a left and right side circuit breaker panel for the medical interior. The ac essential bus contains one addi-tional panel. The circuit breakers provide both ac and dc protection. Popping of a circuit breaker indicates too much current is being drawn by a component in the circuit that is powered through the circuit breaker. Unnecessary recycling of circuit breakers, or using circuit breakers as a switch should not be done.
2.59 AC POWER SUPPLY SYSTEM.
A primary ac power system (Figure 2-17) delivers regu-
lated three phase, 115/200 vac, 400 Hz. Each system con-tains a 30/45 kilovolt-ampere generator mounted on and driven by the transmission accessory gear box module, a current transformer, a generator control unit, and current
Change 4 2-55

UH60Q ELECTRICAL SYSTEM

SA
TM 1-1520-253-10

COPILOT’S CIRCUIT BREAKER PANEL

PILOT’S CIRCUIT BREAKER PANEL
AB0702_1
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Figure 2-18. DC and AC Circuit Breaker Panels (Sheet 1 of 3) TM 1-1520-253-10

MISSION READINESS CIRCUIT BREAKER PANEL AB0702_2
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TM 1-1520-253-10

SA

limiter, all of which are interchangeable. System outputs are applied to the No. 1 and No. 2 ac primary buses. Cau-tion legends will go on, indicating #1 GEN or #2 GEN whenever generator output is interrupted. Another caution legend goes on, indicating AC ESS BUS OFF when there is no power to the ac essential bus. Individual generator controls are provided on the upper console (Figure 2-6), with marked positions of TEST, OFF/RESET, and ON.A generator main bearing caution system is installed on each main generator to light a caution legend, marked #1 GEN BRG or #2 GEN BRG, to indicate a worn or failed bear-ing. The caution legend will remain on until power is removed. The auxiliary bearing will allow 10 additional hours of operation after the legend goes on. Therefore, it should not be a cause for mission abort. Power to operate the caution system is provided from the No. 1 and No. 2 dc primary buses, through circuit breakers, marked NO. 1 GEN WARN and NO. 2 GEN WARN, respectively.
　
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