TM 9-6115-662-13&PSection Ill. PRINCIPLES OF OPERATION1-13 FUNCTIONAL DESCRIPTION.1-13.1 PowerUnitFunctionalDescription.The Power Units are mobile power sources andconsist of one Tactical Quiet 30 kW Generator Set mounted on a modified trailer. The generator sethas a liquid-cooled diesel engine, brushless generator, excitation system, speed governing system, fuelsystem, 24-volt direct current starting system, control system, and malfunction protection system. Thegenerator set has a reconnection board that has been initially positioned to allow power output ofeither 120/208-volt, three phase or 240/416-volt, three phase AC power. The PU-803 uses a DODModel MEP-805A Generator Set operating at 50/60 Hz with a load capacity of 30 kW. The PU-804uses a DOD Model MEP-815A Generator Set operating at 400 Hz. System or equipment load cablesare to be connected to the load terminals on the generator set output panel. Refer toTM 9-6115-644-24 for functional description of the generator set. Refer to TM 9-2330-205-14&P forfunctional description of the trailer.1-13.2 PowerPlantFunctionalDescription. The Power Plant consists of two PU-803 PowerUnits, a switch box and power cable. The two PU-803 Power Units have been modified to provideindependent switching between the Power Units. One PU-803 is modified by moving the accessorystorage box to the curbside fender, adding a switch box and identifying the modified PU-803 asAN/MJQ-40 unit A. The other PU-803 is modified by adding a power cable and identifying themodified PU-803 as AN/MJQ-40 unit B. Refer to paragraph 1-13.1 for the functional description of thePU-803. Output electrical power is normally supplied through the switch box assembly located on unitA. The cable supplied with unit B connects the generator sets through the switch box on unit A. Thecontrol panel of the switch box controls the output source. The output source is usually either the unitA or unit B generator set as determined by the control panel switches S1 and S2. When bothswitches are placed in the ON position and both generators are on, the generators operate in parallel.The parallel operation of the generators allows for an uninterrupted load transfer between unit A andunit B. The output power cable to external equipment may be connected to the switch box from eitherthe connector J1 or load terminals (L0, L1, L2, L3, and GND) of the switch box. If the switch boxbecomes unserviceable, the load cable may be connected to the load terminals on the output panel ofone of the generator sets. When connection is required from the generators, parallel operation is notlost. Refer to TM 9-6115-644-10 for operation and TM 9-6115-644-24 for detailed functionaldescription of the generator sets without a switch box. Refer to TM 9-2330-205-14&P for a detailedfunctional description of the trailer.1-14 RELATED TECHNICAL MANUALS.Refer to appendix A for related technical manuals and lubrication order.1-9 (1-10 Blank)
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