P-9-TM-457-35
T.O. 35C2-3-442-2
TM-07464A-35
TM 5-6115-457-34
proportional to load that is used for the
9.8 VDC proportional to load, the load
parallel system. If a dummy load kit is
measurement unit should be replaced.
utilized with the generator set the load
measurement unit is interconnected with
b. Removal. Refer to figure 6-59 and
the kit sensing circuit.
remove load measurement unit by remov-
ing electrical connector and screws.
6-213. ON EQUIPMENT TEST.
6-214. TEST AND ADJUSTMENT.
a. Symptom and Isolation of Malfunc-
tion. A malfunction of the load measure-
a. Connect load measurement unit to
ment unit is not easily detected during
the test equipment as illustrated in figure
single unit operation unless the set is
6-60.
equipped with a dummy load kit and the
automatic load removal feature is utilized.
b. Test and adjust load measurement
Then a malfunction is usually indicated
unit as specified in table 6-22.
by failure of the dummy load kit automatic
removal circuit. When the unit malfunc-
6-215. DISASSEMBLY.
tions in a generator set that is operating
in parallel, the malfunction is usually in-
Refer to figure 6-61 and disas-
dicated by unequal load sharing. To isolate
semble load measurement unit in the order
the malfunction, proceed as follows:
of index numbers assigned. Pay particular
attention to the following.
1. Remove connector P16 from
load measurement unit and with generator
a. Remove cover (5).
set operating at rated speed and voltage,
measure voltage at connector P16, pins A
NOTE
to K, B to L, and C to M; voltage should
be 120 VAC nominal. Also measure volt-
Leave wires connected to recep-
age across connector pins G to D, G to E,
tacle (7).
and G to F; voltage should be 5.6 VA C at
rated load.
b. Tag and unsolder wires from com-
ponents, exercising care not to apply ex-
2. If above voltages are-met, con-
cessive heat. Unsolder diodes (19) from
nect connector P16 to load measurement
transformer (24),
unit. Operate generator set, controlling
speed with the manual speed control and
6-216. CLEANING.
check load measurement unit output by re-
a. Clean electrical components with
moving connector P1 from the governor
a clean lint-free cloth moistened in an
control unit. Measure voltage across con-
approved cleaning solvent and dry thorough-
nector P 1 pins U(+) and S, voltage should
ly ,
be 9.8 VDC with generator set operating
at rated load.
b. Clean remaining parts in an ap-
proved cleaning solvent and dry thorough-
3. If input voltages are correct
ly .
and the output does not vary between 0 and
Change 3
6-183
