Onan MJA Series Service Manual page 103

R
~,
"
.tt.t:.
V V L. V .L 1" U
LARGE REACTOR CONTROL
MODEL OF REACTOR BUILD-UP
t
MAGNECITER
C
to
31 eta 1 RELAY COIL
C 1 to C2
1
G 1 to G2
14.0 5.0 1.0
02SX1NIA 525 -- 50
12.5 11. 0
04SXINIA & B 1. 77 None
06SXINIA & B 12.5 5.5 .66 None
.l:'
1 ~ L
1)
u.c.
1"
.c. n.ft.
i
V
n
.LU.!.
FIG. 4. L - TABLE OF RESISTANCES, MAGNECITER
3. Connect one test lead to G 1 and the other to G 2 and observe the light
bulb.
4. With the test leads still connected to the gate winding leads, short
aCross leads C 1 and C 2 and again observe the bulb.
5. Connect one test lead to the control winding lead and the other test
lead to one of the gate winding leads and observe the bulb.
RESULTS
1. Reactor is serviceable if bulb is dark for steps 3 and 5 but bright
for step 4.
2. Reactor is defective if bulb lights }'lith low intensity for step 3 indi ­
cating presence of a short in either winding or control winding.
If bulb lights at all during step 5 the control and gate winding are
shorted together. If bulb fails to light in step 4 there is very likely
an open circuit in either the gate Winding or control winding.
If any reactor is defective, replace it.
4.3.3.2 Rectifiers. - Test each rectifier believed to be defective by
isolating it.andmeasuring the resistance first in one direction, then in
the other. If the rectifier is operating properly, one reading will be
much higher than the other. If the 115 volt test lamp is used, first
touch the tester probes together and observe the brightness of the bulb.
Then touch them across the rectifier; If the bulb lights brightly or not
at all, the rectifier is defective. If it lights dimly, this indicates that
the rectifier is passing current in only 1 direction and is functioning
properly . Rep lace any rectifier found defective.