T O 35C2-3-446-1
the "on-coming" set. The lights
(7) Carefully watch the SYNCHRONIZING LIGHTS
should go on and off simultaneo
of the "on-coming" set. At the instant both lights go dark,
ly. If the lights go on and off alter-
move the circuit breaker switch of the "on-coming" set to
nately, sets are out of phase. Stop
the CLOSE position.
both set and correct interconnect
(8) Adjust the voltage and frequency rheostats of the
cables (figure 2-4). If the problem
"on-coming" set until load and current are divided equally
persists, refer to next higher level of
between the two generator sets.
(9) Move the circuit breaker switch (30) of the "on-line"
set to the OPEN position.
(5) Adjust the manual speed control of the "on-coming"
set until the synchronizing lights (25), simultaneously, re-
(10) Place the operations switch of the "on-coming" set
main on or off at 2 to 3 second intervals.
to the SINGLE UNIT OPERATION position.
(6) Carefully observe the synchronizing lights of the
(11) Readjust voltage and frequency of the "on-coming"
"on-coming" set and, at the instant both lights go dark, place
set as necessary.
the CKT BRK switch (30) of the "on-coming" set to the
CLOSE position. When the CKT BRK indicator light (31)
illuminates, the sets are operating in parallel.
OPERATION OF TACTICAL UTILITY
(7) With no external load on the paralleled sets, adjust
the manual speed control (21) of the "on-coming" set until
a. Parallel Operation (Load Sharing).
both percent power meters (kilowatt) indicate zero. Adjust
the voltage adjust rheostat (24) of the "on-coming" set un-
(1) The first set started shall be designated as "on-line"
til the percent of rated current meters (ammeters) on both
and the sets in parallel operation shall be designated "on-
sets indicate zero. Turning counterclockwise will decrease
coming." With all sets shut down connect the load terminal
boards as described in paragraph 2-3e. Check that the voltage
(8) Apply load to the sets. The kilowatt load should
divide so that the load on each set is equal. If the load and
current are not shared equally, adjust the load by observing
the set which has the higher reading on the kilowatt meter
(4). Decrease the engine speed of this set by adjusting
Do not place the circuit breaker
counterclockwise the manual speed control (21) in small in-
switch on any of the generator sets
crements. Increase the engine speed of the set with the lower
i n the CLOSE position until
kilowatt reading by adjusting clockwise the manual speed
specifically directed to do so. Clos-
control in small increments. Adjustments should be made
ing the circuit breaker switch at any
between both sets until the kilowatt meters are balanced.
other time may severely damage one
or more of the generator sets.
(9) The current should divide so that the observed dif-
ference between the current on any phase between the "on-
line" and "on-coming" sets is not more that 20 percent. If
Check that the main power switch
the readings are not within 20 percent, notify higher level
attempting to place a generator set
(2) Start the generator sets as described in paragraph
operated in parallel, one or more
operators must remain with the sets
to monitor the rated load and current
"on-line" set in the CLOSE position until the CKT BRK
meters. Make further adjustments as
indicator light (31) illuminates. Place the operation switch
required to maintain equal load on
(26) in the PARALLEL position.
the paralleled sets.
in the LI - LO position. Adjust the voltage adjust rheostat
(24) until the AC voltmeter indicates 122 volts for the
Prior to removal of generator set
120/208 connection and 244 volts for the 240/416 connec-
from parallel operation, make sure
tion. Adjust manual speed control (21) until the frequency
the load does not exceed the full load
meter indicates 61 Hertz. Place the operation switch (26) of
rating of set(s) remaining on line.
the "on-coming" set in the PARALLEL position.
(10) To remove a generator set from parallel operation,
place the circuit breaker switch of that set in the OPEN posi-
Observe the synchronizing lights of