Charging System - Cs-144: Description
The CS-144 generator with integral regulator shown in Fig 1, features a high ampere output per pound of weight. It does not use a diode trio. The delta stator, rectifier bridge, and rotor with slip rings and brushes, are electrically similar to other CS-series generators. CS stands for Charging System, and 144 indicates the out-side diameter of the stator laminations in millimeters. The bearings are sealed with lifetime lubrication in both end frames. No periodic maintenance is required.
Regulator voltage setting varies with temperature and limits system voltage by controlling rotor field current. When the field current is on, the regulator actually switches rotor field current on and oft at a fixed frequency of about 400 cycles per second to help control radio noise. By varying on-off time, correct average field current for proper system voltage control is obtained. At high speeds, on-time may be 10 percent and off-time 90 percent. At low speeds, with high electrical loads, on-off time may be 90 percent and 10 percent respectively.
A basic wiring circuit for the "PLIS" regulator is shown in Fig 2. 'The "P" terminal connects to the stator. The "S" terminal may be connected externally to the battery to monitor voltage and make sure the regulator maintains an adequate voltage level to charge the battery. If the "S" terminal is not connected externally, integrated circuits in the regulator are used for sensing voltage.
Both the "L" and "I" terminals serve to turn on the regulator and allow field current to flow when the switch is closed. The "I" terminal may be connected either directly to the switch, or through a resistor. The "P" circuit may be used with or without anything connected to the "L" circuit and with or without anything connected to the "L" terminal. When used, the "L" terminal must be connected through an external resistor such as the charging system indicator lamp. When a generator fault is detected, (voltage too high or too low, or no rotation), the regulator grounds the "L" terminal and activates the indicator lamp.