Section III. PRINCIPLES OF OPERATION

TM 9-6115-663-13&P

Section III. PRINCIPLES OF OPERATION

1-13 FUNCTIONAL DESCRIPTION.

1-13.1 Power Unit Functional Description. The Power Units are mobile power sources and

consist of one Tactical Quiet 60 kW Generator Set mounted on a modified trailer. The generator set

has a liquid-cooled diesel engine, brushless generator, excitation system, speed governing system, fuel

system, 24-volt direct current starting system, control system, and malfunction protection system. The

generator set has a reconnection board that has been initially positioned to allow power output of

either 120/208-volt, three phase or 240/416-volt, three phase AC power. The PU-805 uses a DOD

Model MEP-806A Generator Set operating at 50/60 Hz with a load capacity of 60 kW. The PU-806

uses a DOD Model MEP-816A Generator Set operating at 400 Hz. System or equipment load cables

are to be connected to the load terminals on the generator set output panel. Refer to

TM 9-6115-645-24 for fictional description of the generator set. Refer to TM 9-2330-205-14&P for

functional description of the trailer.

1-13.2 Power Plant Functional Description. The Power Plant consists of two PU-805 Power

Units, a switch box, and power cable. The two PU-805 Power Units have been modified to provide

independent switch-kg between the Power Units. One PU-805 is modified by moving the accessory

storage box to the curbside fender, adding a switch box and identifying the modified PU-805 as

AN/MJQ-41 unit A. The other PU-805 is modified by adding a power cable and identifying the

modified PU-805 as AN/MJQ-41 unit B. Refer to paragraph 1-13.1 for the functional description of the

PU-805. Output electrical power is normally supplied through the switch box assembly located on unit

A. The cable supplied with unit B connects the generator sets through the switch box on unit A. The

control panel of the switch box controls the output source. The output source is usually either the unit

A or unit B generator set as determined by the control panel switches S1 and S2. When both

switches 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 and

unit B. The output power cable to external equipment may be connected to the switch box from either

the connector J1 or load terminals (LO, L1, L2, L3, and GND) of the switch box. If the switch box

becomes unserviceable, the load cable maybe connected to the load terminals on the output panel of

one of the generator sets. When connection is required from the generators, parallel operation is not

lost. Refer to TM 9-6115-645-10 for operation and TM 9-6115-645-24 for detailed functional

description of the generator sets without a switch box. Refer to TM 9-2330-205-14&P for a detailed

fictional 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)