P-9-TM-457-35 T. O. 35C2-3-442-2
TM-07464A-35 TM 5-6115-457-34
4. If the current value (step 2 pre-
c. To isolate a malfunction of the en-
ceding) is met, measure voltage across
gine crank relay, place the start-run-stop
terminals of transformer T1. Voltage
switch S2 in the START position and mea-
across terminals 1-2, and 3-4 should be
sure the voltage across A27K3 relay ter-
identical, if not transformer T1 is
minals as follows:
defective.
1. Voltage across Xl(-) and X2(+)
should read 20-32 VDC.
d. Removal. Refer to figure 6-15.
Disconnect all electrical plug connectors at
2. Voltage across Al or A2(+) to
mode I relay box assembly receptacles,
TB2-1(-) should read 20-32 VDC.
then remove the four screws and nuts se-
curing the assembly in position. Remove
NOTE
the mode I relay box assembly.
If the voltage is measured at Xl and
6-97. BENCH TEST.
A2, but not at Al, replace the relay.
d. To isolate a malfunction in the re-
a. Refer to table 6-10 and perform a
active droop circuit, install a shorting plug
continuity test of mode I relay box circuitry.
on paralleling receptacle J45, J46 or J47
located below the manual speed control
b. Connect the mode I relay box assem-
knob. Proceed as follows:
bly to test equipment as illustrated in
1. With the generator set operating
procedural analysis table 6-11
at 100 percent 0.80 PF load, position the
parallel switch S6 to the PARRALLE L
6-98. DISASSEMBLY, Refer to figures
position. Voltage measured across resis-
6-22 and 6-26, and disassemble the mode I
tor R1 located in this Mode I relay box,
relay box assembly in the order of index
as the reactive current rheostat R29,
numbers assigned. Pay particular attention
located on the Mode I relay box, is rotated
to the following.
counterclockwise should increase to
approximately 9 VAC, then decrease to 0
NOTE
VAC as R29 is rotated full clockwise.
Disassemble the mode I relay box
2. If the voltage values (step 1
assembly to the extent necessary
above) are not met, connect a 0-3 amp am-
meter in series with current transformer
to accomplish repair.
CT7. Current measured should be approxi-
a. Remove ten screw assemblies (2,
mately 1.5 amperes at 100 percent, 0.8PF
load.
(1) from chassis assembly (39).
3. If the current value (step 2
b. Tag, then disconnect harness wiring
above) is not met, check continuity of the
from components.
circuit through current transformer CT7
and reactive current rheostat R29. If the
c. Remove battery charging ammeter
circuitry is proper, check R29 for full re-
shunt (R13) engine cranking relay (K3),
sistance range 0-12 ohms.
Change 1
6-67
