Sincro HB4 - Dismantling; Tightening Torques; Connections and Earthing; Preliminary Controls

6.2.3 Dismantling
Fordismantlingfollowinreversetheinstructionsgiven
atassemblysections.
6.2.4 Tightening torques
Formechanicalconnectionsitisrecommendedtouse
screwsclass8.8.
Thetighteningtorquesareshowninthefollowingtable:
6.3 Connections and earthing
Electricalconnectionshavetobedonewithcableswith
sections suitable for the nominal current values and
distances.
Refertofollowingdrawing:
Thegeneratorhousinghastobeconnectedtoearthon
thebase ofthegeneratingset.If flexibleantivibration
dampersaremountedbetweenthegeneratorhousing
anditsbase,anearthconductorshouldbeconnectedin
parallelthroughtheflexiblesupportandbeadequately
sized(usuallyhalfthesectionofthemainlinecables).
BythefeetonthehousingthereisaretwoM8threaded
holesfortheearthingofthehousing(seefigure)forHB
and M10 for IB series.
6.4 Preliminary controls
6.4.1 Control of electrical insulation
Before starting up the generating set or after long
shutdowns, check the insulation resistance of the
windingstoearth.
The results must be over 2 MOhm. If this is not the
case,thealternatoraloneshouldbeovendriedat80-
100°Cfor6hours.
Beforecarryingoutthisoperationremovethevoltage
regulatorandtheemcfilter.
6.4.2 Direction of rotation
Thegeneratorsaredesignedforwithclockwiserotation,
viewed from the coupling side (unless otherwise
specified on order) to produce a U-V-W phase
sequence (according toIEC 60034-8).If rotation has
tobereversedafterdeliveryasktheSincro Technical
Officefortherelevantwiringdiagrams.
Thegeneratorsaresuppliedwithatwo-directionalfan.
6.4.3 Control of voltage and frequency
Controlthatthevoltageandfrequencyvaluesrequired
bythegeneratingsetcorrespondtothegeneratordata
plate.
Disconnect the AVR (voltage regulator)
beforecarryingoutthistest.
CAUTION!
TIGHTENING TORQUES (Nm)
ScrewType
Electrical
connections
Brass
Mechanical
connections
Steel(8.8)
M5 3 6
M6 5 10
M8 10 25
M10 14 49
M12 20 85
M16 40 210
Makesuretheearthingprocedureis
carriedoutproperly.
WARNING!
The windings are tested under high
voltageduringproduction.Additionalhigh-
voltage tests can weaken the insulation
therebyreducingtheworkinglifespan.Ifa
high-voltagetestshouldprovenecessary
forcustomerapproval,thesetestsshould
becarriedoutatlowervoltages.
IMPORTANT!
EARTHING POSITION
Incorrect cables or connections not
properly done, can cause dangerous
overheating.
WARNING!
Thegeneratorleavestheproductionline
with a star connection (unlessotherwise
specied on order) which is used as
referenceforitsnominaldata.Tochange
connection consult the diagrams in the
appendixofthismanual.
WARNING!
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ITALIANOENGLISHFRANÇAISDEUTSCHESPAÑOL