TM-07464A-35 TM 5-6115-457-34
applied. To isolate the malfunction proceed
Exercise extreme care not to touch
electrical connections when work-
ing on the exciter-regulator assem-
bly with the generator set operating.
lator to gain access to test points,
1. With the generator set operating
at rated speed, measure the voltage across
(A10)TB1-7 and (A10)TB1-8 (nominal volt-
1-12. If sensing voltage at TB1-7 and
TB1-8 is normal measure voltage across
(A10)TB2-6 and (A10)TB2-7, minimum volt-
age should be 50 VAC.
(a) If there is no voltage at
TB2-6 and TB2-7 measure voltage across
(A11)TB2-2 and (A11)TB2-3 which is the
generator coil voltage (T9-T12). Shut down
generator set if voltages are normal.
Figure 6-15. Location of exciter
regulator and mode I, mode II,
precise and tactical relay
plug P11 pin H to plug P11 pin G, the read-
ing should be 21 ohms. Pins G, and H of
J11 should read 13 ohms, observe polarity.
(a) If flashing voltage is ob-
(c) If circuit is open replace ex-
citer (A11). If all readings are normal,
scale) across choke (A11)L1 and observe
replace regulator (A10).
for ac voltage when the field is flashed.
(b) If voltage is observed across
2. To check exciter regulator per-
formance when there is no generator output
check for shorted diode CR1, CR2, CR3, or
scale) across resistor (A11)R17 and observe
CR4. If diodes are shorted, replace the
for field flashing voltage when generator
set is started.