TM 9-6115-604-34
NAVFAC P-8-633-34
(7)
Megohmmeter reading for each phase to ground test (phase A to ground, phase B to ground, or phase C to
ground) should be no less than 1 megohm. Clean, dry, or repair exciter rotor assembly if megohmmeter
reading any phase to ground indicates less than 1 megohm. Replace if necessary.
(8)
If all tests are satisfactory, reconnect exciter armature lead wires as tagged to the rotating rectifier
assembly. Remove and discard tags. Reconnect rectifier leads as tagged. Remove and discard tags.
Reinstall generator conduit box cover assembly (6) using hexagon screws (5).
d.
Current Transformers CT2 CT3.
(1)
Perform step a(l) through (3), above.
(2)
Remove generator conduit box cover assembly (6, Figure 5-1) by removing hexagon head screws (5).
(3)
See Figure 5-2. Tag and disconnect wiring from current transformers CT2 and CT3 (5) located on either
interior side of the conduit box assembly (1 1).
(4)
With multimeter set for resistive reading, check winding of each current transformer for continuity.
Resistance reading should be less than 1 ohm (typical).
(5)
Connect a 500 V dc megohmmeter across either transformer lead and to ground. Operate megohmmeter
for 60 seconds and monitor resistance reading. Perform this procedure on both transformers.
(6)
Megohmmeter resistance reading for each transformer should be no less than 100 megohms. Replace
current transformer that fails to pass this test.
(7)
If readings are satisfactory, connect wiring to current transformers CT2 and CT3 as tagged. Remove and
discard tags. Replace conduit box cover assembly (6, Figure 5-1) with hexagon head screws (5).
e.
Exciter Stator (Field).
(1)
Perform step a(1) through (3), above.
(2)
Remove conduit box cover assembly (6, Figure 5-1) by removing hexagon head screws (5).
(3)
Tag and disconnect exciter field leads Fl and F2 from terminal strip TB104 (12, Figure 5-2) on left side of
conduit box assembly (11).
(4)
Obtain a 500 V dc megohmmeter. Connect red megohmmeter lead to one exciter field lead and the black
megohmmeter lead to the exciter stator frame or ground. Operate megohmmeter for 60 seconds and
monitor resistance reading.
(5)
Resistance reading should be no less than 1 megohm. If reading is less, dean, dry and/or repair the
exciter stator. Replace, if necessary.
(6)
If reading is satisfactory reinstall exciter field leads Fl and F2 on terminal strip TB104 (12) as tagged.
Remove and discard tags. Replace conduit-box cover assembly (6, Figure 5-1) using hexagon head
screws (5).
5-7. GENERATOR GI DISASSEMBLY. Repair of the generator Gi consists of disassembly to the extent required for
repair or replacement of a damaged component. Overhaul is accomplished by rewinding of generator coils by the
manufacturer. Remove generator Gi from the generator set in accordance with paragraph 2-16 and disassemble as
follows:
WARNING
Disconnect all power before servicing. Failure to follow all safety Instruction may
result In death or serious Injury.
a.
Strip Heaters Assemblies.
(1)
Remove.
(a) Remove hexagon head screws (5, Figure 5-1) to remove conduit box cover assembly (6).
(b) Tag and disconnect wires HI, H2, H3, and H4 from terminal strip TB1 04 (12, Figure 5-2) at left
interior of conduit box (11). Remove four wire damps, two on each wire harness and separate exciter field wires
Fl and F2 from heater wires Hi to H4. Remove wire damp holding heater wires to bracket (19, Figure 5-1).
Remove mounting screws (60 and 61) and mounting bracket (62) holding strip heater (59) to the generator
bracket (19).
5-7
