TM 5-6115-400-35
lines are not connected together when this
(9) Should the steady state frequency at full
is done.
load be slightly higher than the no load
steady state frequency and adjustments of
(6)
When the voltage A and B are equal on
R11, R12, R16 and R18 will not correct
both sets these lines may be tied together
this condition, adjust R1.
by installing the paralleling cable. Sets
are now ready to be paralleled
c. Parallel Operation.
isochronously and to share loads equally
(1) The voltage at test point 3 and 4 should
using standard paralleling procedures.
again be checked for zero volts with no
(7)
Should sets tend to oscillate during
load on engine.
parallel operation, R14 on each set should
(2) Apply full load to engine and connect a
be adjusted for a lower equal voltage at A
d.c. voltmeter to paralleling receptacle
and B when sets are not in parallel
terminals A and B on the rear of the
operation and paralleling cables not
control panel. Terminal A is positive.
connected.
(3) Adjust R14 (kilowatt adjust on relay box)
(8)
Parallel operation should again be
through its range. With the parallel switch
attempted with this lower voltage at A and
on, the voltmeter should indicate 5 to 10
B as in step 6 above.
volts as R14 is adjusted. Note and record
(9)
Should other than equal sharing of loads
the maximum voltage at full load. Be
be desired, adjust R14 voltage to this ratio
certain frequency is exactly 60 or 50
prior to parallel operation. R14 should not
cycles.
be adjusted during parallel operation
(4) Repeat the above procedure on the other
unless absolutely necessary; however, if a
generator and governor to be paralleled.
slight readjustment of load sharing
(5) Set the paralleling voltage at A and B of
between the paralleled machines is
both generator sets to be paralleled to the
necessary it can be done with R14 while
maximum equal voltage by adjusting R14
they are operating in parallel.
of each making certain the paralleling
Section VI. OVERSPEED GOVERNOR
94. General
protective device with a manual reset.
b. Removal and Installation. Refer to TM 5-6115-
400-12 for removal and installation of the overspeed
It is coupled through an angle adapter to the upper shaft
governor.
of the accessory drive. The governor is driven at one-
half engine speed (900 RPM) and will trip between 120
c. Cleaning, Inspection, and Repair.
and 125 percent of the engine rated speed. The trip
(1) Clean all metal parts thoroughly with an
speeds are as follows:
approved cleaning solvent.
(2) Dry thoroughly and take care to prevent
Engine
Governor
damage to the highly machined surfaces
Speed
Speed
during cleaning. Keep solvent away from
Overspeed
2160 RPM
1080 RPM
non metallic portions of electrical
Overspeed
2250 RPM
1125 RPM
components.
Hydraulic governor
1400 RPM
700 RPM
switch
Field flash and
600 RPM
300 RPM
cranking
178
