Cummins HC Alternator HC634G

Perform PI test for MV/HV windings

Test temperature sensors with alternator running

Record customer settings for temperature sensors

Disconnect cables from X+ (F1) and XX- (F2) terminals of the AVR

Ensure no excitation voltage supply to the exciter stator

Run the generator set in de-excited state

Ensure air flows freely through the alternator

Operate the anti-condensation heater (if fitted)

Direct hot air from electrical fan heaters into the alternator air inlet

Ensure each heat source is at least 300mm away from the windings

Coupling Arrangement Inspection

Remove the DE adapter screen and cover to access the coupling

Check the condition of the coupling discs

Are any coupling discs damaged, cracked, or distorted?

Replace the complete set of discs if any are damaged

Check tightness of bolts fixing the coupling discs to the engine flywheel

Check for signs of wear, fretting, or other detrimental features

Inspect for damage to seals, grease leakage, or discoloration of the bearing races

Does the bearing need to be replaced?

Describe any issues found during inspection

Environmental and Cleanliness Check

Check environmental conditions and cleanliness

Measure ambient temperature inside

Measure ambient temperature outside

Check complete machine for damage, loose parts and earth bonds

Check guards, screens, warning and safety labels