NOTE
VISUALLY CHECK THAT THE POWER CABLE AND PARALLEL CABLE ARE
IN ACCORDANCE WITH FIGURE 2-3B.
IF THE CABLES ARE NOT AT-
TACHED AS INDICATED, SHUT DOWN THE “ON-LINE” SET AND FOL-
LOW INSTRUCTIONS IN PARAGRAPH 2-14D.
CAUTION
DO NOT ATTEMPT LOAD CONNECTS IN PARAGRAPH 2-14D UNLESS ALL
SETS ARE OFF AND NO OTHER EXTERNAL VOLTAGE IS APPLIED TO
THE LOAD.
STEP 1.
THE SET IN OPERATION SHALL BE DESIGNATED AS “ON-LINE” AND THE SETS PLACED
IN PARALLEL OPERATION SHALL BE DESIGNATED “ON-COMING.”
STEP 20
PLACE THE OPERATIONS SWITCH (FIGURE 2-5) ON BOTH SETS IN THE PARALLEL OPER-
ATION POSITION.
CAUTION
DO NOT CLOSE THE CIRCUIT BREAKER SWITCH AFTER STARTING THE
“ON-COMING” SET AS SERIOUS DAMAGE TO ONE OR BOTH GENERATOR
SETS MAY RESULT.
STEP 3.
REFER TO FIGURE 2-6 AND 2-7 (DO NOT PERFORM STEP 8 OF FIGURE 2-7), AND START
THE “ON-COMING” SET.
STEP 4.
NOTE THE VOLTAGE INDICATED ON THE “ON-LINE" SET.
ADJUST THE VOLTAGE OF THE
“ON-COMING" SET TO THE VOLTAGE NOTED ON THE “ON-LINE” SET.
STEP 5.
ADJUST THE FREQUENCY OF THE “ON-COMING” SET TO A HIGHER VALUE THAN THAT OF
THE “ON-LINE” SET.
STEP 6.
SLOWLY REDUCE THE FREQUENCY OF THE “ON-COMING” SET UNTIL THE SYNCHRONIZING
LIGHTS (FIGURE 2-5) FLASH AT 2 TO 3 SECOND INTERVALS.
CAUTION
DO NOT PLACE THE CIRCUIT BREAKER SWITCH OF THE “ON-COMING”
SET IN THE CLOSE POSITION WHILE THE SYNCHRONIZING LIGHTS
ARE LIT AS DAMAGE TO ONE OR BOTH GENERATOR SETS MAY RESULT.
STEP 7.
CAREFULLY WATCH THE SYNCHRONIZING LIGHTS OF THE “ON-COMING” SET.
AT THE
INSTANT BOTH LIGHTS GO DARK, MOVE THE CIRCUIT BREAKER SWITCH OF THE “ON-COMING” SET
TO THE CLOSE POSITION.
STEP 8.
LOAD AND
STEP 9.
STEP 10.
ADJUST THE VOLTAGE AND FREQUENCY RHEOSTATS OF THE “ON-COMING” SET UNTIL
CURRENT ARE DIVIDED EQUALLY BETWEEN THE TWO GENERATOR SETS.
MOVE THE CIRCUIT BREAKER SWITCH OF THE “ON-LINE” SET TO THE OPEN POSITION.
PLACE THE OPERATIONS SWITCH OF THE “ON-COMING” SET TO THE SINGLE UNIT OPER-
ATION POSITION.
Figure 2-10. Parallel Operation (Load Sharing and Load Transfer)
2-26.2
Change 12
(Sheet 4 of 5)
