Dismantling Format Sae; Tightening Torques; Connections And Earthing; Preliminary Controls - Sincro SK315 Serie Manual De Uso Y Mantenimiento

6.2.2 Dismantling format SAE

For dismantling follow in reverse the instructions given
at section 6.2.1.
Be sure that the transit bar that holds rotor in position
is placed before any transport of the generator.
WARNING!

6.2.3 Tightening torques

For mechanical connections it is recommended to use
screws at least class 10.9
The tightening torques are shown in the following table:
TIGHTENING TORQUES (Nm)
Electrical
Screw Type connections
Steel (8,8)
M5 5,9
M6
M8
M10
M12
M16 210

6.3 Connections and earthing

Electrical connections have to be done with cables with
sections suitable for the nominal current values and
distances.
Not correct 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 is an M10 threaded
hole to simply earthing of the housing (see figure) for
SK315/355 and M12 for SK400/450 - SK500 series.
Make sure the earthing procedure is carried out
properly.
WARNING!
24
Mechanical
connections
Steel (10,9)
8,7
10 15
25 36
49 72
85 125
310
EARTHING POSITION

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 2M Ohm. 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 thereby reducing the
IMPORTANT!
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 an unidirectional fan.