P-8-627-34
T O 35C2-3-442-2
TM 5-6115-457-34
TM-07464A-35
b . Removal. Refer to figure 6-59 and
proportional to load that is used for the
remove load measurement unit by remov-
parallel system. If a dummy load kit is
ing electrical connector and screws.
utilized with the generator set the load
measurement unit is interconnected with
6-214. TEST AND ADJUSTMENT.
the kit sensing circuit.
a. Connect load measurement unit to
6-213. ON EQUIPMENT TEST.
the test equipment as illustrated in figure
6-60.
a. Symptom and Isolation of Malfunc-
tion. A malfunction of the load measure-
b. Test and adjust load measurement
ment unit is not easily detected during
unit as specified in table 6-22.
single unit operation unless the set is
equipped with a dummy load kit and the
6-215. DISASSEMBLY.
automatic load removal feature is utilized.
Refer to figure 6-61 and disas-
Then a malfunction is usually indicated
semble load measurement unit in the order
by failure of the dummy load kit automatic
of index numbers assigned. Pay particular
removal circuit. When the unit malfunc-
attention to the following.
tions in a generator set that is operating
in parallel, the malfunction is usually in-
a. Remove cover (5).
dicated by unequal load sharing. To isolate
WARNING
the malfunction, proceed as follows:
Avoid breathing fumes generated by
1. Remove connector P16 from
Unsoldering/soldering. Eye pro-
tection is required.
load measurement unit and with generator
set operating at rated speed and voltage,
NOTE
measure voltage at connector P1 6, pins A
Leave wires connected to recep-
to K, B to L, and C to M; voltage should
tacle (7).
be 120 VAC nominal. Also measure volt-
b. Tag and unsolder wires from com-
age across connector pins G to D, G to E,
ponents, exercising care not to apply ex-
and G to F; voltage should be 5.6 VAC at
cessive heat. Unsolder diodes (19) from
rated load.
transformer (24).
6-216. CLEANING.
2. If above voltages are met, con-
a. Clean electrical components with
nect connector P16 to load measurement
a clean lint-free cloth moistened in an
unit. Operate gene rator set, controlling
approved cleaning solvent and dry thorough-
speed with the manual speed control and
ly.
check load measurement unit output by re -
moving connector P1 from the governor
WARNING
control unit. Measure voltage across con-
nector P1 pins U(+) and S, voltage should
Cleaning Solvents are f lammable and
moderately toxic to skin, eyes and
be 9.8 VDC with generator set operating
respiratory tract. Eye and skin
at rated load.
protect ion required. Good general
ventilation is normally adequate.
3. If input voltages are correct
b. Clean remaining parts in an ap-
and the output does not vary between 0 and
9.8 VDC proportional to load, the load
proved cleaning solvent and dry thorough-
measurement unit should be replaced.
ly
q
Change 8
6-183
