BOLT 6V5844 - Caterpillar

Wiring Diagrams
Introduction
The 3100 Series Generator is a complete electrical power system consisting of three basic components; the AC generator, a brushless exciter and a magnetic amplifier type voltage regulator. The brushless exciter and the generator field rotate and are mounted on a common shaft. The voltage regulator consists of four basic circuits: 1. Sensing and differential detector2. Differential pre-amplifier3. Saturable transformer (magnetic amplifier)4. Output rectifier bridgeAll of the regulator components are mounted within the control console at the rear of the generator.Operation
The closed loop control block diagram illustrates the generator regulator system divided into basic functions. To increase the performance of the generator, a voltage regulator is used as a generator field exciter. With external constant field excitation, the generator output terminal voltage would be the same as normal, ranging from 10 to 50% regulation. The regulator on the 3100 series generators insures an output voltage that is constant within 2% under rated full load conditions. The regulator obtains its power from the generator output voltage and current. The voltage and current are combined magnetically in a saturable transformer (TS-1). The transformer is specially designed with a control winding that reduces the output as the control signal increases. Winding (H), the transformer primary, provides the power to the transformer from the generator output voltage under no load current conditions. L1 is a series current limiting reactor that provides a reasonably constant supply current to the transformer. Winding (X) is the output AC which is rectified by the bridge circuit (BR-1) to provide direct current for field excitation. Winding (I) is the load current boost. Since generator field excitation is nearly proportional to load current, an increasing load will provide additional current to transformer (TS-1) resulting in a nearly exact increase in field excitation.The generator output voltage is decreased through transformer action, rectified by diodes (D5, D6, D7, D8) and filtered to a smooth, low ripple, direct current by (L2, R17 and C2). A small portion of this DC voltage, at voltage divider (R12, R13, R14) is compared to a reference zener (Z1) voltage. The difference voltage is amplified by transistors (Q3) and (Q4). The output of (Q3) and (Q4) drives (Q1) and (Q2) to furnish a value of control current necessary to maintain desired field excitation.To provide a means for voltage adjustment, compensation for circuit tolerance and increases in field power due to thermal effects, a control winding (C), connected to C- and C+, is powered by a transistorized pre-amplifier. Parallel Operation
The 3100 Series voltage regulator can be modified for parallel operation. With the paralleling option, two or more generators may be operated in parallel, regardless of rating, provided each generator has the same phase, voltage and frequency. Each generator should supply no more than its full KW load rating. Do not attempt to operate the 3100 Series Generator in parallel, when not equipped with the paralleling option. Never attempt to parallel the 3100 Series Generator with commercial sources.
Do not close the load circuit breakers until the