7-6
Main Rotor
Winding Insulation Resistance: Disconnect the
main rotor leads from terminals F1+ and F2+ on the
rotating rectifier assemblies and isolate them from
ground. Tag and mark each lead with its terminal
number (F1+ or F2+).
CAUTION
Because of the opposing residual
magnetism of the rotor, it might be difficult to re-
establish self excitation if the polarity of the
main rotor leads is reversed upon reassembly.
Connect either or both leads to the megger and con-
duct the test as instructed under Winding Insulation
Resistance Test Procedure.
Winding Resistance: Disconnect the main rotor
leads from terminals F1+ and F2+ on the rotating
rectifier assemblies and measure electrical resist-
ance between them. Replace the rotor if the resist-
ance is not as specified in Table 7-1.
Reconnect the rotor leads and torque the terminals
to 24 lb-in (2.7 N-m) when reassembling.
MAIN
FIELD
ROTOR BEARING
PRESS ON TO SHOULDER
DO NOT LUBRICATE SHAFT
MAIN ROTOR LEADS PASS THROUGH EX-
CITER ROTOR TO F1+ AND F2− ON RO-
TATING RECTIFIERS. DISCONNECT
LEADS WHEN TESTING MAIN ROTOR.
TORQUE NUTS TO 24 LB-IN (2.6 N-M)
FAN
BLADES
EXCITER ROTOR
PRESS ON TO SHOULDER
DO NOT LUBRICATE SHAFT
DRIVE DISC
CHAMFERED EDGE
TOWARDS FLYWHEEL
FIGURE 7-4. ROTOR ASSEMBLY
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