Caution: This document contains mixed page sizes ... - Igor Chudov
Caution: This document contains mixed page sizes ... - Igor Chudov
Caution: This document contains mixed page sizes ... - Igor Chudov
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EXCITER ROTOR<br />
WHEATSTONE<br />
BRIDGE OR DIGITAL<br />
OHMMRER<br />
TESTlNG WINDING<br />
RESISTANCE<br />
J - Testing Generator Stator<br />
CONNECTION DIAGRAM<br />
~ ~<br />
Stop engine and PTO unit. Disconnect leads to<br />
engine starting battery, negative (-} lead first.<br />
IBWAR"GI Accidenfal sfarfing of the gen-<br />
erator can cause severe personal injury or<br />
death, Dlmnneci ihe pmpulsion engine<br />
baiierycables, negative (-) lead firs$ before<br />
continuing wifh these fest procedure.<br />
Using proper test equipment, check the stator<br />
for grounds, opens, and shorts in the windings.<br />
Testing for Grounds: Some generators have<br />
ground connections tothe frame. Checkwiring<br />
FIGURE 6. TESTING EXCITER ROTOR<br />
9<br />
~~ ~ ~~ ~<br />
MEGGER OR INSULATION<br />
RESISTANCE METER<br />
TESTING WINDING<br />
FORGROUNDS<br />
ES-17oOs<br />
diagram. All stator leads must be isolated for<br />
testing.<br />
Use a megger or insulation resistance meter<br />
which applies 500 VDC or more to the test<br />
leads. Test each stator winding for a short to<br />
the laminations. A reading less than 100,000<br />
ohms indicates a questionable stator. Thor-<br />
oughly dry the stator and retest.<br />
Testing for Open or Shorted Wlndings: Test<br />
for continuity between coil leads shown in Fig-<br />
ure 7: wire pairs TI -T2 and T3-T4 should have<br />
equal resistance. Use an accurate instrument<br />
for this test such as a Kelvin bridge or digital<br />
ohmmeter. Resistance values at 77" F (25" C)
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