Dismantling Format Sae; Tightening Torques; Connections And Earthing; Preliminary Controls - Sincro SK225 Serie Manuel D'utilisation Et De Maintenance

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 class 10.9.
The tightening torques are shown in the following table:

6.3 Connections and earthing

TIGHTENING TORQUES (Nm)
Electrical
Screw Type connections
Brass
M5
M6
M8 10
M10 14
M12 20
M16 40
Electrical connections have to be done with cables with
sections suitable for the nominal current values and
distances.
Refer to following drawing:
Incorrect cables or connections not properly
done, can cause dangerous overheating.
WARNING!
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 4 M8 threaded holes
for the earthing of the housing (see figure) for SK225 and
M10 for SK250 series.
Make sure the earthing procedure is carried
out properly.
WARNING!
22
Mechanical
connections
Steel (10.9)
3 8,7
5 15
36
72
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.
The results must be over 2 MOhm. If this is not the case,
Disconnect the AVR (voltage regulator)
before carrying out this test.
CAUTION!
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 working lifespan. If a high-
IMPORTANT!
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 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
WARNING!
nominal data. To change connection consult
the diagrams in the appendix of this manual.