Description & Operation

The CS130 and CS144 (Charging System) series generators have high amperage output. The "130" and "144" designation is the outside diameter of the stator laminations, measured in millimeters. CS series generators include a delta stator, rectifier bridge, and rotor with slip rings and brushes. A built-in regulator incorporates fault detection circuitry. See Fig 1 . A conventional pulley and external fan are used to cool slip ring end frame, rectifier bridge and regulator. On CS130D models, "D" indicates Dual Internal Fan (DIF) design.

Most CS series generators operate with 2 wire connections and a ground path through the mounting bracket. The first wire connection is the BAT (output) terminal. This terminal must be connected to the battery during operation. The second wire connection is through the charge indicator light, voltmeter or an external resistor to terminal "L" of the regulator. This connection provides initial excitation at start-up and gauge or charge indicator light operation.

Regulated voltage varies with temperature. System limits voltage by controlling rotor field current while field current is on. Regulator switches rotor field current on and off at a fixed frequency of 400 cycles per second to help control radio noise. By varying overall on/off time, correct average field current for proper system voltage control is obtained. At high speeds, with lower electrical loads, on-time may be 10 percent. At low speeds, with higher electrical loads, on-time may be as much as 90 percent. See GENERATOR OUTPUT RATING  table.

Fig 1: Charging System Wiring Schematic

Courtesy of GENERAL MOTORS CORP.