Connections And Earthing; Preliminary Controls; Control Of Electrical Insulation; Direction Of Rotation - Sincro SK160 Serie Manual De Uso

6.3 Connections and earthing

Electrical connections have to be done with cables with
sections suitable for the nominal current values and
distances.
Incorrect cables or connections not
properly done, can cause dangerous
overheating.
WARNING!
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 are two M8 threaded
holes for the earthing of the housing (see figure).
EARTHING POSITION
EARTHING POSITION
Make sure the earthing procedure is
carried out properly.
WARNING!
22

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.
Disconnect the AVR (voltage regulator)
before carrying out this test.
CAUTION!
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.
The windings are tested under high
voltage during production. Additional high-
voltage tests can weaken the insulation
IMPORTANT!
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.

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.
The generator leaves the production line
with a star connection (unless otherwise
specified on order) which is used as
reference for its nominal data. To change
WARNING!
connection consult the diagrams in the
appendix of this manual.
All changes in connection must be carried
out solely by a qualified specialist.
WARNING!