Cummins HC Alternator HC544F

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

Is the excitation voltage supply to the exciter stator disconnected?

Run the generator set in a de-excited state

Is air flowing freely through the alternator?

Is the anti-condensation heater operating?

Direct hot air from 1 to 3 kW electrical fan heaters into the alternator air inlet

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

Check for signs of wear or damage

Is there any damage to the seals?

Is there any discoloration of the bearing races?

Does the bearing need to be replaced?

Describe any issues found during inspection

Turn off the anti-condensation heater (if fitted) and isolate from supply.

Remove the lower air inlet cover.

Remove the terminal box lid and side panel (left hand, viewed from NDE).

Disconnect the grease pipe (if fitted) from the bearing cartridge and the NDE bracket.

Use a 10 mm open spanner to disconnect the RTD sensor for bearing temperature (if fitted) from the bearing.

Perform PI test for MV/HV windings

Test temperature sensors with alternator running

Record customer settings for temperature sensors

Inspect the condition of the bearings

Grease the re-greasable bearings

Record customer settings for bearing temperature sensors