Section 7

DIAGNOSTIC TESTS

40

Figure 7-10. – Brush Leads

Test 9 – Check Brushes & Slip Rings

DISCUSSION:

Brushes and slip rings are made of special materials that will provide hundreds of hours of service with little wear. However, when the generator has been idle for some time, an oxide film can develop on the slip rings. This film acts as an insulator and impedes the flow of excitation current to the Rotor.

If Test 4 resulted in less than one-half rated output voltage, it is possible that the brushes and slip rings are at fault.

PROCEDURE:

1.Gain access to the brushes and slip rings.

2.Remove Wire 4 from the positive (+) brush termi- nal.

3.Remove the ground wire (Wire 0) from the nega- tive (-) brush.

4.Remove the brush holder, with brushes.

5.Inspect the brushes for excessive wear, damage, cracks, chipping, etc.

6.Inspect the brush holder, replace if damaged.

7.Inspect the slip rings.

a.If slip rings appear dull or tarnished they may be cleaned and polished with fine sandpaper. DO NOT USE ANY METALLIC GRIT TO CLEAN SLIP RINGS. (A 400 grit wet sandpaper is rec- ommended).

b.After cleaning slip rings, blow away any sandpa- per residue.

RESULTS:

1.Replace bad brushes. Clean slip rings, if neces- sary.

2.If brushes and rings are good, go to Test 10.

Test 10 – Check Rotor Assembly

DISCUSSION:

During the “Test 4 – Fixed Excitation Test,” if AC out- put voltage did not come up to about one-half rated volts, one possible cause might be a defective Rotor. The Rotor can be tested for an open or shorted condi- tion using a volt-ohm-milliammeter (VOM).

Also see Chapter Three, “INSULATION RESISTANCE TESTS”.

PROCEDURE:

Gain access to the brushes and slip rings. Disconnect Wire 4 and Wire 0 from their respective brushes and remove the brush holder. Then, test the Rotor as fol- lows:

1.Set a VOM to its “Rx1” scale and zero the meter.

2.Connect the positive (+) meter test lead to the positive (+) slip ring (nearest the Rotor bearing). Connect the common (-) test lead to the nega- tive (-) slip ring. Read the resistance of the Rotor windings, in OHMS.

 

ROTOR RESISTANCE *

 

 

 

MODEL

 

OHMS

 

 

 

RV45 5410/5411

 

13.4Ω

 

 

 

RV55 5412/5413

 

14.88Ω

 

 

 

RV65 5414/5415

 

10.81Ω

 

 

 

*Resistance values In ohms at 20° C. (68° F.). Actual readings may vary depending on ambient temperature. A tolerance of plus or minus 5% is allowed.

3.Set the VOM to its “Rx1 K” or “Rx10,000” scale and zero the meter.

4.Connect the positive (+) meter test lead to the positive (+) slip ring, the common (-) test lead to a clean frame ground (such as the Rotor shaft). The meter should read “Infinity”.

RESULTS:

1.Replace the Rotor if it fails the test.

2.If Rotor checks good, perform “Insulation Resistance Test,” on Page 14.

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Generac Power Systems 5413, 5412, 5411, 5415, 5414, 5410 manual Test 9 Check Brushes & Slip Rings, Test 10 Check Rotor Assembly
Page 43 Page 45

5410, 5414, 5415, 5413, 5411 specifications

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