Caution: This document contains mixed page sizes ... - Igor Chudov

START
Is control panel field
breaker CB21 ON?
no
A
and check continuity with
ohmmeter. Is breaker open?
ti0
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Replace defective
field breaker.
v
I 1 4 I I
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t -t-l
Push to reset breaker. Does generator
If voltage is unstable, high or low, or
causes breaker to trip, see Flow Charts
AC output voltage build up?
B. C, D. or E
P I I I I
I - 1 t
no
Is residual voltage across 1621-62 and 63
5 to 10 VAC or more?
Check reactor L21 and transformer T21 per
TESTS [B] and [E].
Is exciter field voltage
across VR21-5 & 6 5 VDC
Check exciter field wiring
for opens per TEST [MI.
Replace bad wiring.
Check exciter field winding
per TEST [HI. Replace
if bad.
Do not replace the printed circuit board
until the trouble not on the PC board has
been located and corrected to avoid damage lo new PC board.
Check diodes and SCR's on
bridge assembly CR21 per
TEST [C].
Check fuses F2 and F3 for
continuity on VR21 regu-
Check exciter field wiring
for shorts per TEST [MI.
Replace bad wiring.
v
Replace voltage regulator
PC board per procedure IF].
' 22
Flash exciter field per TEST [D]. Does
generator output voltage build up?
Disconnect stator leads 7 and 8 from TB21-62
and 63. Is residual voltage across leads 5
to 10 VAC or more now?
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Check lead continuity between
VR21-12 & l7 on generator,
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Check diodes CR1 through CR6
on rotor per TEST [GI. Re-
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Check exciter rotor winding
per TEST [J]. Replace if bad.
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