Operating Generator Sets in Parallel - TM-9-6115-661-13-P0076

TM 9-6115-661-13&P

h. At generator set 2 control panel:

(1) Set UNIT-PARALLEL switch (16) to PARALLEL. Both SYNCHRONIZING LIGHTS (12) should

be going bright to dark together.

CAUTION

If SYNCHRONIZING LIGHTS on generator set 2 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.

(2) Increase frequency until SYNCHRONIZING LIGHTS (12) blink together one or more times per

second.

(3) Decrease frequency until SYNCHRONIZING LIGHTS (12) blink together once every 3-4 seconds.

CAUTION

Check that load contactor at load is open before attempting to place

generators on line. Failure to observe this caution can result in damage

to generator sets.

(4) When both SYNCHRONIZING LIGHTS (12) are dark, position and hold AC CIRCUIT INTER-

RUPTER switch (13) of generator set 2 in the CLOSED position until indicator light (14) goes out.

SYNCHRONIZING LIGHTS (12) should go out (both generators are now operating in parallel with

no load).

Rotate FREQUENCY adjust potentiometer (15) of generator set 1 until Percent Power meter (10)

reads approximately 0.

Rotate VOLTAGE adjust potentiometer (11) of generator set 1 until AC Amperes meter (9) reads

approximately 0.

Close the load contactor at the load.

NOTE

If the REVERSE POWER indicator on the Fault Indicator panel of either

generator set lights, and the AC Circuit Interrupter relay opens, open the load

contactor at load and desynchronize the generator sets (Repeat the necessary

steps d through j above).

Compare AC Amperes meter (9) readings of both generator sets. If readings are not within 10

percent, notify next higher level of maintenance.

m. Compare Percent Power meter (10) readings of both generator sets. If readings are not within 10

percent, notify next higher level of maintenance.

n. Close control panel access cover (7) and secure with clamping catch (8).

Perform the PMCS listed as DURING in table 2-2.

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