Exercise of Engine on Standby Service

TM 5-6115-465-12

TO 35C2-3-446-1

NAVFAC P-8-625-12

TM 06858B/06858D-12

b. Parallel Operation (Load Transfer). The follow-

(7) Carefully watch the SYNCHRONIZING

LIGHTS of the "on-coming" set. At the instant both

ing method of parallel operation is to be used when it

lights go dark, move the circuit breaker switch of the

is necessary to transfer the load from one set to the

"on-coming" set to the CLOSE position.

other without interrupting power.

(8) Adjust the voltage and frequency rheostats

NOTE

of both sets until load and current are divided equal-

ly between the two generator sets, as explained in

Visually check that the power cable

paragraph 2-13a steps 7 and 8.

and parallel cable are in accordance

with figure 2-5. If the cables are not

(9) Move the circuit breaker switch (30) of the

attached as indicated, shutdown the

"on-line" set to the OPEN position.

"on-line" set and follow instructions

in paragraph 2-12c. Parallel cables

( 1 0 ) Place the operations switch of the "on-

not required with utility generator

coming" set to the SINGLE UNIT OPERATION

sets.

position.

(11) Readjust voltage and frequency of the "on-

CAUTION

coming" set as necessary.

D o not attempt load connects in

(12) Refer to paragraph 2-11 and stop the "on-

paragraph 2-12c unless all sets are off

line" set.

and no other external voltage is ap-

plied to the load.

(1) The set in operation shall be designated as

"on-line" and sets placed in parallel operations shall

a. General. The diesel engine of a generator set on

be designated "on-coming".

standby service which is normally operated under op-

timum conditions should be exercised at least every

(2) Place the operations switch (26, figure 2-7) on

30 days. However, under any extreme environmental

both sets in the PARALLEL OPERATION position.

c o n d i t i o n , the interval between exercise periods

s h o u l d be shortened appropriately. The exercise

period should be long enough to enable the engine to

CAUTION

attain normal operating temperature.

b . Exercise Procedures.

Do not close the circuit breaker

switch after starting the "on-coming"

(1) Perform the before operation checks and ser-

set as serious damage to one or both

vices of table 3-1.

generator sets may result.

(2) Refer to paragraph 2-10 and start the engine.

(3) Refer to paragraph 2-10 and start the "on-

coming" set. Do not perform steps 7 & 8 of figure 2-8.

(3) After allowing sufficient warm up time, run

the engine at full speed for the period of time required

(4) Note the voltage indicated on the "on-line"

t o obtain two consecutive collant temperature

set. Adjust the voltage of the "on-coming" set to the

readings at a 15 minute interval of 160°F (71°C)

voltage noted on the "on-line" set.

minimum.

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

(4) Allow the engine to run for an additional 30

to a higher value than that of the "on-line" set.

minutes while performing the during operation checks

and services listed in table 3-1.

(6) Slowly reduce the fre uency of the "on-

coming" set until the SYNCHRONIZING LIGHTS

(25, figure 2-7) flash at 2 to 3 second intervals.

(5) Refer to paragraph 2-11 and stop the engine.

(6) Perform the after operation checks and ser-

vices listed in table 3-1.

CAUTION

(7) Correct any deficiencies note during or after

Do not lace the circuit breaker

operation.

switch of the "on-coming" set in the

C L O S E position while the SYN-

C H R O N I Z I N G LIGHTS are lit as

damage to one or both generator sets

may result.

2-20.2

Change 14