Power Unit PE-214-B - TM 11-945 War Department Technical Manual

a. Power Unit PE-214-B is a compact, light-weight, electric generating set, consisting of a gasoline engine GE-12-B and an alternating current generator GN-51-B. It is designed to deliver 300 watts at either 120 or 240 volts a-c. b. Engine GE-12-B is a single-cylinder, air-cooled, two-cycle gasoline engine which develops one hp. at 3000 rpm. c. Generator GN-51-B is a single phase, 60 cycle unit of the revolving-field type, and is coupled directly to the engine crankshaft by means of a female splined coupling (582) which matches the splined extension on the engine crankshaft (428). d. The complete power unit is contained in an open frame (559) of tubular construction. It is mounted on four rubber shock mountings (570) which hold the unit securely in place when transported and also serve to absorb vibrations when the equipment is in operation. A metal box (558) for tools and spare parts is attached to the tubular frame assembly. The net weight of the complete power unit, ready for field service, is approximately 54 pounds with the fuel tank empty. a. Engine. The gasoline engine GE-12-B is a single-cylinder, two-cycle, air-cooled unit with a 2-inch bore, a l 4-inch stroke and a piston displacement of 4.72 cubic inches. It is designed to operate satisfactorily on commercial gasolines with an octane rating as low as 62, and will run approximately 7 / hours at full load on a single filling of the fuel tank (544). The fuel tank capacity is one gallon. b. Generator. (1) The generator GN-51-B has a two-winding stator (stationary member) (587) designed to supply 60 cycle, single phase alternating current at either 120 or 240 volts. Within the stator is the rotating field (585) which consists of a cylindrical Fig. 3 — Unpacking Sequence permanent magnet mounted on the generator shaft. No brushes or slip rings are employed. (2) The generator output is 300 watts at 100 per cent power factor. When connected for 120 volts, the voltage output without load is approximately 128 volts, while at full load of 300 watts, the voltage output is approximately 118 volts. The electric governor on the engine causes the engine speed to increase with increasing generator load, so that from no load to full load the voltage output is held between these two values. (3) When connected for 240 volts, the voltage output will vary approximately between 256 and 234 volts from no load to full load. (4) A single, 20-ampere twist-lock receptacle is located in the outer end casting of the generator, as are also three binding posts. Two of these posts are for output, while the other, which is marked “G”, is for a ground connection. (Do not use pliers on these posts.) Note: Do not use output posts except in cases of emergency where no connecting plug is available. c. Magneto. Ignition is supplied by a high tension, flywheel-type magneto. This consists of a rotor (479) (moving member) and a stator plate (480) (stationary member) mounted directly on the engine crankcase. d. Carburetor. The carburetor (483) is of the float feed type. Fuel is supplied to it directly from the gasoline tank through the fuel line. e. Air cleaner. The air cleaner is of the replaceable cartridge type. Its function is to prevent the air which enters the carburetor from drawing dust and dirt into the engine. f. Governor. The governor (529) is of the electric solenoid type and is actuated by generator voltage. The solenoid is mounted on the carburetor, and the plunger or armature is connected to the carburetor throttle shaft by a link and lever arrangement.

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