Operating Generator Sets in Parallel

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Figure 2-8. Power Plant Operation

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TM-9-6115-666-13-P AN/MJQ-1612 60kW 50/60 Hz Power Plant Diesel Engine Driven 5 Ton Trailer Mounted Manual

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Operating Generator Sets in Parallel (cont)

ARMY TM 9-6115-666-13&P

AIR FORCE TO 35C2-3-505-1

2.5.3.2. Operating Generator Sets in Parallel. The generator sets can be operated in parallel through the

switch box or at the generator set load terminals. When paralleling at the generator set load terminals, refer to

paralleling procedures in TM 9-6115-645-10. When paralleling at the switch box, perform the following

procedures:

WARNING

Prior to making any connections for parallel operation, ensure that there is no input to the

load and that the generator sets are shut down. Failure to observe this warning can result in

serious injury or death by electrocution.

WARNING

Never attempt to start the generator set if it is not properly grounded. Failure to observe

this warning can result in serious injury or death by electrocution.

NOTE

In this procedure, generator set one is started first and generator set two is started second.

a. Ensure that load requirement is equal to or below the combined rated capacity of the two generator

sets.

b. Perform the Preventive Maintenance Checks and Services (PMCS) listed as "BEFORE" in table 2-2.

CAUTION

Do not close the AC CIRCUIT INTERRUPTER switch on either of the generator sets or

close the load contactor at load until specifically directed to do so. Closing any of these

devices at any other time may severely damage one or both of the generator sets.

c. Refer to paragraph 2.5.3.1 steps b through i , to start the first generator set and bring it on line.

d. On the operating generator set (generator set 1) position UNIT-PARALLEL switch (10, figure 2-8) to

PARALLEL.

e. Start generator set and adjust voltage and frequency to match operating generator set.

f. At switch box, set generator set switch S1 or S2 (7 or 8), to ON (up) (CHECK TO SEE THAT BOTH

INDICATOR LIGHTS, DS1 (5) AND DS2 (6) ARE ON).

g. At generator set control panel:

(1) Set UNIT-PARALLEL switch (10) to PARALLEL.

CAUTION

If SYNCHRONIZING LIGHTS (11) on generator set do not go bright and dark in unison, the

phasing is wrong. Shut down generator sets and check that load cables are connected

properly. Failure to observe this caution can result in damage to generator sets.

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