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

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:
TIGHTENING TORQUES (Nm)
Electrical
Screw Type connections
Brass
M5
M6
M8 10
M10 14
M12 20
M16 40

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 is are two M8 threaded
holes for the earthing of the housing (see figure) for HB
and M10 for IB series.
Make sure the earthing procedure is
carried out properly.
WARNING!
22
Mechanical
connections
Steel (8.8)
3 6
5 10
25
49
85
210
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.
The results must be over 2 MOhm. If this is not the
Disconnect the AVR (voltage regulator)
before carrying out this test.
CAUTION!
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
specifi ed on order) which is used as
reference for its nominal data. To change
WARNING!
connection consult the diagrams in the
appendix of this manual.