P-9-TM-457-35
T.O. 35 C2-3-442-2
TM-07464A-35
TM 5-6115-457-34
(c) Repeat the procedures out-
R28 should be made when the
lined in steps (a) and (b) on set to be con-
generator set is not operating
nected in parallel with set number one.
in parallel. However, if a
slight readjustment of load
(d) Adjust the real load sharing
sharing between parallel
potentiometer R28 on each generator set so
operating sets is necessary,
that the voltage across pins G and J in con-
such a slight readjustment
nector J17 is identical.
is permissible. The same
results can usually be ob-
tained, however, by adjust-
NOTE
ing the frequency reference
adjustment potentiometer R1.
Make sure during the procedure
outlined in steps (a) and (b) that
6-211A.
the load contactor swtich is open
ALIGNMENT PROCEDURES
PECULIAR TO OPERATION
so that pin G or J of one genera-
OF 400 HZ GENERATOR SETS
tor set connector J17 is not
IN SUPPORT OF E3A AIRCRAFT,
connected to pins G or J of an-
other generator set contactor
J17.
a. If necessary, refer to Operator and
Organizational Maintenance Manual and ad-
just precise governor actuator linkage.
Refer to Operator and Organizational
Maintenance Manual and begin parallel opera-
tion.
b. Refer to figure 6-54 for location of
adjustments and test points.
(e) If the generator sets tend to
1. Isochronous Operation.
oscillate during the first attempt at parallel
operation, remove from parallel operation,
readjust real load sharing potentiometer
(a) Before starting engine,
rotate frequency and adjust rheostat R1 on
R28 for a lower voltage across pins G and J
main generator control panel for precise
in connector J17, and place generator sets
generator sets to a mid-rotation position.
in parallel operation again. It may be nec-
e ssary to repeat this operation several times
(b) Before starting engine,
until the proper voltage is obtained. When
rotate magamp bias balance potentiometer
the proper voltage setting on each generator
R11, feedback null adjustment potentiometer
set has been obtained, and it will be possible
R14, feedback gain adjustment potentiometer]
to parallel isochronously with equal load
R16, and frequency gain adjust potentiomete
sharing during each paralleling operation.
R18 on precise governor control unit to a
mid-rotation position. Then rotate load
(f) If other than equal load shar-
ing is desired, then adjust potentiometer
measurement gain adjustment potentiometer
R15 to a three-quarter-rotation clockwise
R28 to obtain the proper ratio voltage de-
position.
sired.
NOTE
(c) Start engine and operate at
400 hertz, no load. Observe governor actu-
ator unit piston for hunting. If governor
Under normal conditions, any
adjustment of potentiometer
actuator unit piston is hunting, adjust R18
6-182
Change 3
