Guardian Technologies 4758 TEST 8 - RESISTANCE CHECK OF ROTOR CIRCUIT, Section, Diagnostic Tests

SECTION 2.4

DIAGNOSTIC TESTS

PART 2

AC GENERATORS

TEST WINDINGS FOR A SHORT TO GROUND:

13.Make sure all leads are isolated from each other and are not touching the frame.

14.Set a VOM to its "R x 10,000" or "R x 1K" scale and zero the meter

15.Connect one test lead to a clean frame ground. Connect the other test lead to stator lead Wire 11.

a.The meter should read INFINITY

b.Any reading other than INFINITY indicates a

"short-to-ground" condition.

16.Repeat Step 15 using stator lead Wire 33.

17.Repeat Step 15 using Pin 1.

18.Repeat Step 15 using Pin 3

19.Repeat Step 15 using Pin 5

20.Repeat Step 15 using Pin 7

TEST FOR A SHORT CIRCUIT BETWEEN WINDINGS:

21.Set a VOM to its "R x 10,000" or "R x 1K" scale and zero the meter.

22.Connect one test lead to stator lead Wire 11. Connect the other test lead to stator lead Wire 33.

a.The meter should read INFINITY.

b.Any reading other than INFINITY indicates a short circuit between windngs.

23.Repeat Step 22 using stator lead Wire 11; Pin 1

24.Repeat Step 22 using stator lead Wire 11; Pin 3

25Repeat Step 22 using stator lead Wire 11; Pin 7

26.Repeat Step 22 using stator lead Wire 33; Pin 1

27.Repeat Step 22 using stator lead Wire 33; Pin 3

28.Repeat Step 22 using stator lead Wire 33; Pin 7

29.Repeat Step 22 using Pin 1; Pin 3

30.Repeat Step 22 using Pin 1; Pin 7

31.Repeat Step 22 using Pin 3; Pin 7

TEST CONTROL PANEL WIRES FOR CONTINUITY:

32.Set a VOM to its "Rx1" scale.

33.Disconnect the C2 connector from the control panel. (C2 is the closest to the back panel). Refer to Figure 6 for pin locations.

33.Connect one meter test lead to Pin 5 of the C2 connector, connect the other test lead to Wire 22 at the voltage regulator. CONTINUITY should be measured.

34.Connect one meter test lead to Pin 6 of the C2 connector, connect the other test lead to Wire 11 at the voltage regulator. CONTINUITY should be measured.

35.Connect one meter test lead to Pin 7 of the C2 connector, connect the other test lead to Wire 6 at the voltage regulator. CONTINUITY should be measured.

36.Connect one meter test lead to Pin 8 of the C2 connector, connect the other test lead to Wire 2 at CB2 (DPE circuit breaker). CONTINUITY should be measured.

RESULTS:

1.Stator winding resistance values is a test of winding continuity and resistance. If a very high resistance or INFINITY is indicated, the winding is open or partially open.

2.Testing for a "grounded" condition: Any upscale movement of the meter needle or dial indicates the winding is grounded.

3.Testing for a "shorted" condition: Any upscale movement of the VOM needle or dial indicates the winding is shorted.

4.If the stator tests good and wire continuity tests good , perform “Insulation Resistance Test” on page 1.4-4.

5.If any test of wire continuity failed in control panel failed, repair or replace the wire, terminal or pin connectors for that associated wire as needed.

NOTE: Read section 1.4, "Testing, Cleaning and Drying" carefully. If the winding tests good, perform an insulation resistance test. If the winding fails the insulation resistance test, clean and dry the stator as outlined in Section 1.4. Then, repeat the insulation resistance test. If the winding fails the second resistance test (after cleaning and drying), replace the stator assembly.

TEST 8 - RESISTANCE CHECK

OF ROTOR CIRCUIT

DISCUSSION:

To verify the zero current draw reading and measure the rotor circuit.

PROCEDURE:

1.Disconnect Wire 4 from the voltage regulator. It is located 3rd terminal from the top of the volt regulator.

2.Set VOM to the "Rx1" scale.

3.Connect one test lead to Wire 4. Connect the other test lead to a clean frame ground. Note the resistance reading. Compare to specifications on Page 2.

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