Sincro HB4 - Wiring Diagrams for Different Circuits; Initial Start-Up; 7 Aftersales Assistance and Maintenance; Control and Check Procedures

6.4.6 Wiring diagrams for different circuits
Intheappendixofthismanualtherearediagramsfor
connectionsotherthanthefactorystar-seriesconnec-
tion(standardunlessotherwisespeciedonorder).
6.4.7 Initial start-up
Beforestartingupthegeneratingsetcheckthatallex-
ternalconnectionsareinorderandthattheprotections
areinplace.
Duringtheinitialstart-uppayparticularattentionforany
unusualnoisethatmightsignalanincorrectalignment
betweenengineandgenerator.
Generatorsarerotatingelectricalmachinesthatinvolve
potentiallyhazardousliveormovingparts,thereforethe
followingisstrictlyprohibited:
• animproperuse;
• removalofcoversanddisconnectionofsafeties.
Dueto theseinherent hazards,all works ofelectrical
ormechanicalnaturemustbecarriedoutbyqualied
specialists.
7. AFTERSALES ASSISTANCE AND
MAINTENANCE
7.1 Control and check procedures
7.1.1 Control of windings and electrical insulation
The condition of the windings can be checked by
measuring their insulation resistance. While running
thistestdisconnectthevoltageregulatorandEMCfilter.
Itisusuallysufficienttocontrolthemainwinding.
The readings should give a measurement of at least
2 MOhm. If the insulation resistance is below this
threshold, the alternator alone should be oven dried
at 80 ÷ 100°C for 6 hours. Before carrying out this
operationremovethevoltageregulator.
7.1.2 Control of the rotating rectifier diodes
This check can be performed with a multimeter, the
knob must be selected to the position “Diode test”.
The lead of each diode hasto beremoved fromthe
connectionswiththerotorexciter(seefigure),butit’s
not necessary to removed them from the alluminium
platewheretheyarefixed.
The faulty diode will have high (theoretically infinite)
resistance in both directions (open diode) or it can
havelowresistanceonbothdirections(diodeinshort)
by placing the tips on both directions. Meanwhile
thecorrectworking diode willhave low resistancein
forwarddirectionandhigh(theoreticallyinfinite)inthe
other(reverse)direction.
7.1.3 Control of bearings
During maintenance control the condition of the
bearings and check that no grease has leaked; the
lifespan of the bearings depends on the vibrations,
axial strains they undergo (vibrations can increase
considerablywithabadalignment)andontheworking
conditions.Socheckforanyunusualsigns:vibrations,
unusualnoises,cloggedairvents.
If undue vibrations or noises appear after long-term
usage, these could bedue to a worn bearingthat, if
damaged,hastobereplaced
The bearing should always be replaced after 20.000
working hours.
The lack of routine check-ups and poor
maintenance can causesevere damage
topersonsand/orobjects.
WARNING!
The maintenance and fault diagnostic
procedures involve risks that may
cause severe injury or even death.
These procedures should therefore be
carried out solely by qualied electrical
and mechanical specialists. Before any
maintenance and cleaning work make
surethattherearenoliveparts,thatthe
generatorhousinghascooledtoambient
temperature, that the generating set
cannotbeaccidentallystartedupandthat
allproceduresarestrictlyobserved.
WARNING!
Do not touch the generator while in
operation and immediatly after the
generatingsethasstopped,sincecertain
partsmaystillbeveryhot.
WARNING!
Long periods of sustained vibrations
can damage thebearing ballsand their
seat.Toohighhumiditycanemulsifythe
greaseandencouragecorrosion.
IMPORTANT!
Intense vibrations caused by the engine
bad alignment of the components inthe
generating set put the bearing under
stressesthatwillreduceitslifespan.
IMPORTANT!
Abearingslifespaniscloselylinkedtothe
workingconditionsandenvironment.
IMPORTANT!
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