source, or while the generator set is
paralleled to another set which is op-
Do not attempt to connect the paral-
leling cable while either or both of
the sets to be paralleled is operating.
Make sure that there is no input to the
load from another source. Failure to
observe this warning may result in
death by electrocution.
Precise generator sets equipped with
the electric governor system cannot be
paralleled with sets that have the
electro hydraulic governor system.
(1) If the generator sets are to
share a load greater than the KW rat-
ing of a single set, connect load ter-
minal boards as shown in figure 2-3A.
This arrangement allows for sharing or
transferring of the load between gen-
(2) Open the left access door to
the set compartment and remove the
safety cover from the terminal board
(3) Insert load leads through
plate and sleeve assembly (figure 2-3)
located to the left of the generator
set air intake.
The load terminal boards will accommo-
date 2-wire single phase and 4-wire
three phase loads.
One or more single
phase loads can be served alone or in
combinations with three phase loads; but
the load on any one phase must not ex-
ceed 100 percent of the current rating
of that phase.
Be sure that wire sizes
are correct for load to be carried.
(4) Connect the load to terminals
marked L1, L2, L3 and L0 (figure 2-3).
Make certain that the load terminal
boards of the sets to be paralleled are
Reading left to
right, phase rotation for the phase
loads is L1, L2, L3. Be sure L1 is
connected to L1, L2 is connected to L2,
(5) Connect load leads and paral-
leling cables as shown in figures 2-3A
After load connection, tighten binding
nuts with plastic/phenolic box end
wrench and install safety cover.
Paralleling of tactical precise genera-
tor sets requires that paralleling ca-
bles be installed and the shorting plug
located on one of the paralleling re-
ceptacles of each generator set be re-
2-15. Exercise of Engine on Standby Service.
A diesel engine on standby service that is custom-
arily operated under optimum conditions should be
exercised at least every 30 days. However, under
environmental conditions involving extreme tempera-
tures, humidity, dust, sand, etc., it maybe found
necessary to shorten the interval between exercise
periods teas often as weekly. Exercise period
should be long enough to enable the engine to attain
normal operating temperature (160°-200°F) while
carrying, if possible, at least 50 percent of its
To exercise engine, proceed as
a. Perform the preparation for starting instruc-
tion shown in figure 2-6. Make complete visual
inspection of unit to be sure it is in operating condi-
b. Start engine as shown in figure 2-7. After an
acceptable warm-up period, run engine at rated speed
with whatever load is available, up to full load, for