Guardian Technologies 5308 Manual De Usuario

Page 46

BRUSHES

2. Remove Wire 4 from the positive (+) brush terminal.

3. Remove the ground wire (0) from the negative (-) brush.

4. Remove the brush holder, with brushes.

5. Inspect the brushes for excessive wear, damage, cracks, chip-

ping, 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 necessary.

2. If brushes and rings are good, go to Test 14.

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 voltmeter to measure resistance.

2. Connect the positive (+) meter test lead to the positive (+) slip

ring (nearest the Rotor bearing). Connect the common (-) test
lead  to  the  negative  (-)  slip  ring.  Read  the  resistance  of  the
Rotor windings, in OHMS.

*

004451-0      004986-0

7.01Ω

004582-0,1   004987-0   005209-0

7.71Ω

004582-2      004987-1

13.1Ω

004583-0      005308-0

14.2Ω

* 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. 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 “Rotor  Insulation  Resistance

Test,” on Page 15.

POSITIVE (+)
TEST LEAD

PROCEDURE:
Perform  this  test  in  the  same  manner  as Test  1,  but 

apply a load to the generator equal to its rated capac-

ity. With load applied check voltage and frequency.
Frequency should not drop below about 59 Hertz with 

the load applied.
Voltage  should  not  drop  below  about  235 VAC  with 

load applied.

RESULTS:
1. If voltage and/or frequency drop excessively when the load is

applied, go to Test 16.

2. If load voltage and frequency are within limits, end tests.

PROCEDURE:
Add up the wattages or amperages of all loads pow-

ered by the generator at one time. If desired, a clamp-

on  ammeter  may  be  used  to  measure  current  flow. 

See “Measuring Current” on Page 7.

RESULTS:
1. If the unit is overloaded, reduce the load.