12 LEAD HIGH VOLTAGE (PARALLEL) WYE (STAR) CONNECTIONVOLTAGEL-LL-N60 HZ24023022020813912012712012 LEAD HIGH VOLTAGE (SERIES) DELTA CONNECTIONVOLTAGEL-LL-N60 HZ 240 12012 LEAD HIGH VOLTAGE (PARALLEL) DELTA CONNECTIONVOLTAGEL-LL-N60 HZ 120 N.A.6
OPERATIONInitial Pre-Start InspectionBefore starting the unit for the first time, the followinginspections and checks are recommended:a. Clear the site area of any loose parts, connections,or foreign materials such as cut off tie wrap ends,scrap insulating tape, tools, hardware, etc.b. Insure that the set turns freely. Bar the set over byhand for at least 2 revolutions to be sure that thereis no interference. Do not use the generator’s fan asa fulcrum to bar over the set. If the generator rotorseems to bind, check for clearance in the generatorand exciter air gap.c. Check all wiring against the proper connectiondiagrams, and insure that all connections andterminations are tight and properly insulated.<strong>PANCAKE</strong> <strong>GENERATOR</strong>S MAY HAVE VOLTAGEPRESENT AT THEIR LEAD TERMINALS WHEN THESHAFT IS ROTATING. DO NOT PERMIT OPERATIONOF THE UNIT UNTIL ALL LEADS HAVE BEENCONNECTED AND INSULATED. FAILURE TO DO THISMAY RESULT IN PERSONAL INJURY OR EQUIPMENTDAMAGE.d. Insure that all equipment is properly grounded(earthed).e. Inspect for any remaining packing materials, andremove any loose debris, building materials, rags,etc., which could be drawn into the generator.f. Check all fasteners for tightness.g. Check all access plates, covers, screens, andguards. If they have been removed for assembly orinspection, reinstall and check for security.h. Review all prime mover manufacturer’s pre start‐upinstructions, and insure that all recommended stepsand procedures have been followed.i. Remove any paint masking material from thegenerator nameplate and warning/caution decals.Initial Start-UpThe following procedure should be followed for starting‐upthe generator set for the first time:a. The generator output must be disconnected from theload. Be sure that the main circuit breaker or fuseddisconnect is in the open position.b. Open the input power to the automatic voltageregulator (AVR). Remove the fuse or disconnect andinsulate one of the AVR input power leads (see AVRmanual).c. Insure that all prime mover manufacturer’spre‐start-up and start‐up procedures have beenfollowed.d. Start the prime mover, and adjust it for properspeed (frequency). (See generator nameplate.)e. The purpose of this initial test with the AVR outof the circuit is to detect any wiring mistakeswithout exposing the unit to undue risk. Checkall Line‐to‐Line and Line‐to‐Neutral voltages forbalanced voltage. At this point, with the AVRde‐energized, the residual voltage should beabout 10% to 25% of rated value. If voltages areunbalanced, shut down the equipment and check forimproper wiring. Re‐start the set, and again checkfor voltage balance. If the problem persists, consultthe factory. If everything checks good, shut downthe set and reconnect the AVR. It is recommendedthat the residual voltage, together with driver rpm,be recorded for use as a future troubleshootingbenchmark.f. Start the set and adjust the terminal voltage tothe desired value by means of the AVR voltageadjustment device. If the AVR is equipped with astability adjust, follow the instructions in the AVRmanual to adjust the stability. Again, check allline‐to‐line and line‐to‐neutral voltages for balance.It is recommended practice to record the no loadexcitation (DC voltage across F+ and F‐) togetherwith line‐to‐line voltage and driver rpm as a benchmark for future troubleshooting.THIS PROCEDURE MUST BE CONDUCTED BYQUALIFIED ELECTRICAL PERSONNEL. LETHALVOLTAGE MAY WELL BE PRESENT AT BOTH. THE<strong>GENERATOR</strong> AND VOLTAGE REGULATOR TERMINALSDURING THIS PROCEDURE. CAUTION MUSTBE EXERCISED NOT TO COME INTO PERSONALCONTACT WITH LIVE TERMINALS, LINKS, OR STUDS.SERIOUS INJURY OR DEATH COULD RESULT.g. Close the main circuit breaker to the load. If the unitis equipped with space heaters, insure that they areturned off.h. Monitor the generator output current to verify that itis at or below nameplate value.7
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