Thermo King SLXi Spectrum, Maintenance Manual

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Electrical Maintenance 8-9
Rotor
1. Place 15 volts dc across the slip rings on the rotor.
CAUTION: Turn off the dc power source before installing or removing test leads on slip rings to prevent arcing and damage
to the slip ring surface.
2. Check the current draw. The draw should be near the appropriate value shown in the following chart.
3. Remove the power source from the rotor.
4. Check resistance. Resistance of winding should be near specified resistance.
5. Check for grounded slip ring or windings by placing an ohmmeter across the rotor body and the slip rings.
Should be no continuity.
6. Check condition of slip rings.
a. Clean the brush contacting surfaces with a fine crocus cloth, wipe dust and residue away.
b.If surfaces are worn beyond this restoration, replace the entire rotor assembly.
7. Replace entire rotor assembly if any of the following conditions exist:
a. Stripped threads on shaft.
b.Worn bearing surfaces.
c. Scuffed pole fingers.
Rear Housing Inspection
1. O-ring
2. Bearing Bore
Alternator Current Draw
23 amp
37 amp
65 amp
120 amp 2.5 amps @ 20.0°C
5.18 amps @ 25.0°C
5.77 amps @ 25.0°C
Not Available
Alternator Rotor Resistance
23 amp
37 amp
65 amp
120 amp 6.0 Ohms @ 20.0°C
2.9 Ohms @ 25.0°C
2.6 Ohms @ 25.0°C
2.6 Ohms @ 25.0°C