Parallel Operation (Load Sharing).

TM 5-6115-465-12

TO 35C2-3-446-1

NAVFAC P-8-625-12

TM 06858B/06859D-12

CAUTION

(3) Insert load leads through plate and

sleeve assembly (figure 1-2) located to the left of

Do not place the circuit breaker switch

the generator set air intake.

on any of the generator sets in the

NOTE

CLOSE position until specifically direc-

ted to do so. Closing the circuit breaker

The load terminal boards will accommo-

switch at any other time may severely

date 2-wire single phase and 4-wire

damage one or more of the generator

three phase loads. One or more single

sets.

phase loads can be served alone or in

combinations with three phase loads;

CAUTION

but the load on any one phase must

not exceed 100 percent of the cur-

Check that the main power switch

Be sure

rent rating of that phase.

(figure 2-5) at the load is open before

that wire sizes are correct for load to

attempting to place a generator set

be carried.

on line.

(4) Connect the load to terminals marked

(2) Start the generator sets as described

L1, L2, L3, and LO (figure 2-3).

in paragraph 2-10. Do not perform steps 7 & 8 of

figure 2-8.

NOTE

Make certain that the load terminal

(3) Hold the CKT BKR switch (30, figure

boards of the sets to be paralleled are

2-7) of the "on-line" set in the CLOSE position

Reading left to

connected properly.

until the CKT BRK indicator light (31) illuminates.

right, phase rotation for the phase

Place the operation switch (26) in the PARALLEL

loads is L1, L2, L3. Be sure L1 is

position.

connected to L1, L2 is connected to

(4) Adjust the voltage on both sets to the

L2 etc.

required value. Adjust the frequent y of the "on-

(5) Connect load leads and paralleling cables

line" set to the required value. Place the operation

as shown in figures 2-4 and 2-5.

s w i t c h (26) of the "on-coming" set in the

PARALLEL position.

NOTE

After load connection, tighten binding

NOTE

nuts with plastic/phenolic box end

Observe the synchronizing lights of the

wrench and install safety cover.

"on-coming" set. The lights should go

on and off simultaneously. If the lights

NOTE

go on and off alternately, sets are out

Paralleling of tactical precise generator

of phase. Stop both sets and correct

sets requires that paralleling cables be

interconnect cables (figure 2-4). If the

installed and the shorting plug located

problem persists, refer to next higher

on one of the paralleling receptacles

level of maintenance.

of each generator set be removed.

(5) Adjust the frequency of the "on-coming"

d. Parallel Operation (Load Sharing).

set a little higher than the "on-line" set. Then

reduce the frequency slowly with the frequency

(1) The first set started shall be designated

adjust reheostat (29) until the synchronizing lights

as "on-line" and the sets in parallel operation

(25) remain on or off at 2 to 3 second intervals.

With all sets

shall be designated on-coming".

shut down install the paralleling cable and connect

the load terminal boards as described in paragraph

2-3e. Check that the voltage reconnection boards

(paragraph 2-4) of the sets are identically posi-

tioned.

Change 16

2-19