CONTROL GP-ELECTRONIC 7X1362 - Caterpillar

D311, D320, D330, D333, D342, D343, D353, D379, D398 Engines Equipped With SRSE GeneratorsSUPPLEMENT: 08/26/81ENGINE NEWS APRIL 1, 1981, PAGES 4 AND 5.In the article, "Test Procedure For Exciter Reactors On SRSE Generators" that starts on Page 4, the voltages shown on the second line of the "Voltage Test Chart" on Page 5 are not correct. Change the voltages for the 5L7024 and 5L7039 Reactors to read: X2, 59.8-66.2; Y2, 95.0-105.0; Z2, 2.46-2.74.
--------------- END SUPPLEMENT ---------------SUPPLEMENT: 05/21/81ENGINE NEWS, APRIL 1, 1981, PAGES 4 AND 5.In the article, "Test Procedure For Exciter Reactors On SRSE Generators" that starts on Page 4, a correction is needed to the last paragraph of the article (Connection "Z2" is wrongly shown as "Z3"). Under "Exciter Reactor Winding Test", change Step 4 to read:
4. Check the X2, Y2, and Z2 voltages found in Step 2 with the respective X2, Y2, and Z2 voltages shown in the chart, or the corrected voltages if corrections were made in Step 3. Each of these voltages must be in the range shown for the specific winding and reactor.
--------------- END SUPPLEMENT ---------------A test procedure is now available to easily check the exciter reactor during troubleshooting of Statically Regulated-Statically Excited (SRSE) generators. The procedure that follows will permit checks of the exciter reactor polarity and the condition of the windings. To make the tests, AC (alternating current) and DC (direct current) voltmeters are needed. The 6V3030 Digital Multimeter Group can be used, or other voltmeters which have the necessary range, including panel types with a dial face and needle.
Exciter Reactor Polarity Test
1. Connect a 6 or 12 volt battery and switch to the H1 and H3 terminals, and a DC voltmeter to the X1 and X2 terminals as shown in Illustration 1. Be sure the positive (+) and negative (-) connections are correct, as shown.
Illustration 1. Connections for exciter reactor polarity test.2. Adjust the voltmeter to a 10 or 20 volt scale first. For some reactor windings, it will be necessary to use a lower voltage scale to get an indication.3. Look at the voltmeter and move the switch to the "ON" position. The desired indication is a positive (+) voltage on the digital multimeter, or a needle movement up the scale on a dial face voltmeter. The indication will be only temporary, and the meter will go back to zero.4. After two seconds or more, move the switch to the "OFF" position. The desired indication is a negative (-) voltage on the digital multimeter, or a needle movement down the scale (below the zero) on a dial face voltmeter. This indication, like the one in Step 3, will be only temporary, and the meter will go back to zero. Do not move the switch to either the "ON" or "OFF" position at intervals of less than two seconds minimum. Shorter intervals will not permit stability in the flow of current.5. Do Steps 3 and 4 again with the voltmeter connected to Y1 and Y2, then with the voltmeter connected