Wiring Diagrams For Different Circuits; Initial Start-Up; Aftersales Assistance And Maintenance; Control And Check Procedures - Sincro HB Série Manuel D'utilisation Et De Maintenance

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 specifi 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.
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!
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 qualifi ed
specialists.
7. AFTERSALES ASSISTANCE AND
MAINTENANCE
The maintenance and fault diagnostic
procedures
cause severe injury or even death.
These procedures should therefore be
WARNING!
carried out solely by qualifi 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.
The lack of routine check-ups and poor
maintenance can cause severe damage
to persons and/or objects.
WARNING!

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
involve risks that may
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.
HB

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.
A bearings lifespan is closely linked to the
working conditions and environment.
IMPORTANT!
Long periods of sustained vibrations
can damage the bearing balls and their
seat. Too high humidity can emulsify the
IMPORTANT!
grease and encourage corrosion.
Intense vibrations caused by the engine
bad alignment of the components in the
generating set put the bearing under
IMPORTANT!
stresses that will reduce its lifespan.
IB
25