1981/04/01 Caterpillar


Test Procedure For Exciter Reactors On SRSE Generators

Usage:


D311, D320, D330, D333, D342, D343, D353, D379, D398 Engines Equipped With SRSE Generators

SUPPLEMENT: 08/26/81

ENGINE 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: 05/21/81

ENGINE 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.

NOTE: 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 to Z1 and Z2. This will make sure all the connections have the correct identification marks.

If the polarity of the "H" winding is not known, it can be checked as follows:

... The single terminal on one side of the reactor is H1 and the two terminals on the opposite side are H2 and H3.
... Connect a 115 Volt AC source to H1 and to either terminal on the opposite side (H2 or H3).
... Check the voltage between the H1 terminal and the terminal on the opposite side which is not connected to the 115 Volt source (the third terminal).
... If the voltage measures less than 115 Volts (approximately 105 Volts), the voltmeter is connected to H1 and H2, and the 115 Volt source is connected to H1 and H3.
... If the voltage measures more than 115 Volts (approximately 126 Volts), the voltmeter is connected to H1 and H3, and the 115 Volt source is connected to H1 and H2.

This permits correct identification of the "H" winding terminals.

Exciter Reactor Winding Test

1. Connect a 115 Volt AC source and an AC voltmeter to the reactor as shown in Illustration 2. Be sure to make good, tight electrical connections for accuracy in voltage measurements.


Illustration 2. Connections for exciter reactor winding test.

2. With the AC voltage source "ON", check and make a note of the voltages at X2, Y2, and Z2. Also, check the source voltage across H1 and H3.

3. If the voltage of the AC source is not exactly 115 Volts, find the correction factor and multiply the voltages in the chart by this factor.

Example: If the AC source voltage is 119 Volts, the correction factor will be 119 ÷ 115 = 1.038. Multiply the chart voltages by 1.038.

4. Check the X2, Y2, and Z3 voltages found in Step 2 with the respective X2, Y2, and Z3 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.

Caterpillar Information System:

1981/04/01 New Shield Assemblies Used In Water Shielded Manifold Group
1981/04/01 Different O-Ring Seal Now Used On The Oil Pump Suction Tube
1981/04/01 New Inlet And Exhaust Valves And Valve Guides Have Tighter Fit To Prevent Corrosion And Guide Wear
1981/04/01 Brass Plug Now Used Instead Of Steel Plug In Sea Water Aftercooler
1981/04/01 6V4163 Bit And 6V4164 Driver Now Available For Removal Of Bolts For Flyweight Carrier
1981/04/01 Special Studs And Nuts Available For Exhaust Manifolds On Engines Used In Heavy Load Conditions
1981/03/04 Two New Exhaust Manifolds Available For Replacement Of Single Rear Manifold To Prevent Broken Studs
1981/03/04 Check Oil Level Carefully To Prevent Operation With Too Much Oil In Engine Crankcase
1981/03/04 Pipe Plug Added To Rear Of Cylinder Block Prevents Oil Leakage Into Flywheel Housing
1981/03/04 Later Pistons Have A Smaller Number Of Drain Holes In Oil Ring Groove
1981/03/04 List Of Service Publications
1981/03/04 Two New Oil Filter Assemblies Available; Always Use Correct Oil Filter And Follow Caterpillar Change Intervals
1981/04/01 Correct Installation Of Inserts Necessary During Repairs To Prevent More Counterbore Cracks
1981/04/01 6V4009 Dowel Driver Available
1981/04/01 Fuel Pressure Relief Valve Is Shown Inverted (Wrong End Up) In Parts Book Illustrations
1981/04/01 New Aftercooler Core Has Improved Design To Prevent Vibration Damage Which Lets Coolant Into Engine Air Inlet
1981/04/22 Cooling System Cleaner Removes Rust And Corrosion
1981/04/22 Check All Settings When Fuel Injection Pump Group Is Installed
1981/04/22 New Piston Ring Assemblies Give Improved Ring And Cylinder Liner Life
1981/04/22 New Ahead Main Shaft Assembly Gives A Tighter Fit; Dimensions For The Fit Of Shafts And Gears
1981/04/22 FT1585 Plate Can Be Fabricated For Governor Spring Guide Replacement
1981/04/22 6V3150 Engine Pressure Group Gives Direct Indication Of Manifold Pressure
1981/04/22 Check Operation Of Hydramechanical Shutoff At Specific Intervals
1981/04/22 Woodward Governor Available For Parallel Generator Applications
Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.