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6) Make sure that the alternator's non-drive end side bearing has the recommended expansion allowance (min. 2 mm.) and
that it is preloaded by a preload spring.
B3/B9 CONSTRUCTION FORM
This type of mounting arrangement allows direct coupling of alternator and drive engine. Please follow the instructions below
when assembling:
1) Secure the cover "C" to the first mover as shown in Figure 2A.
2) Secure the alternator to its cover with the 4 bolts provided as shown in Figure 2B.
3) Apply the tie rod "13" for the axial securing of the rotor, inserting the washer "50", screwing the self-locking nut "51" and
pulling out the tie rod about 2mm, as shown in Figure 2C.
4) Axially lock the rotor by tightening the tie rod with a torque wrench (tightening torque of 21 Nm for M8 tie rods, 48 Nm
for M10 and 120 Nm for M14 tie rods) as shown in Figure 2D.
Check that the self-locking nut "51" has a threaded portion of the tie rod that enters the rotor thus allowing
a secure locking. Before assembly, check that the coupling conical seats (on the alternator and engine) are
regular and clean.
In the case where there is a threaded reduction sleeve, it must be screwed onto the engine shaft first and then proceed as
shown in sections 1-2-3-4.
B2 CONSTRUCTION FORM
This construction form too allows direct coupling of alternator and drive motor. Please follow the instructions below when
assembling:
1) Check that the rotor is positioned correctly, as illustrated in Figure 3A.
2) Remove rotor's locking components on the coupling side.
3) Place the alternator next to the drive motor, as illustrated in Figure 3B.
4) Centre and secure the stator to the drive motor's flange, using suitable screws, as shown in Figure 3C.
5) Centre and secure, using appropriate screws, the coupling to the drive motor's flywheel working through the air outlet, as
indicated in Figure 3D.
Turn the rotor as shown in Figures 4A and 4B.
FINAL CHECKS
At the end of all the overwrite couplings it is necessary to control the correct axial positioning; it must be verified
that between the end of non-drive end side and the surface of axial clamping exists a space of 3 mm.
4. USAGE
Power cables connections should be carried out by qualified personnel when the machine is completely
stopped and the power cable is disconnected.
Voltage and output frequency
These alternators are designed to supply only the voltage and frequency specified in the rating plate.
5. ALTERNATORS OF E1X SERIES (WITH AUTOMATIC VOLTAGE REGULATOR)
Figure 5: Wiring diagram
Power cables connection
A) Start series connection+neutral 230/400V-50Hz (277/480V-60Hz)
B) Start parallel connection+neutral 115/200V-50Hz (138/240V-60Hz)
C) Delta series connection 230V-50Hz (277V-60Hz)
D) Delta parallel connection 115V-50Hz (138V-60Hz)
E) Zig-zag connection+neutral 200/346V-50Hz (240/415V-60Hz)
F) Single-phase connection 230V-50Hz (277V-60Hz)
WINDING - RESISTANCE Ω (20 °C)
POWER
Alternator
KVA
KVA
TYPE
50 Hz
60 Hz
8
10
1.53
E1X13S/2
10
12.5
1.07
12.5
15
0.69
16
19.5
0.43
E1X13M/2
22
26
0.33
6.5
8
2.36
E1X13S/4
8
10
1.88
10
12
1.26
14
17
0.69
E1X13M/4
16
19
0.64
(*) The resistance values of main winding are referred to star-series connection
Voltage calibration. The calibration of voltage should be carried out by qualified personnel only because
of electrocution hazard.
Output voltage regulation should be carried out at nominal revolving speed (3000/3600 rpm for 2 poles alternators and 1500/1800
rpm for those at 4 poles) within the nominal value +/-5%.
The alternators are calibrated to deliver the nominal voltage. To correct the output voltage of the alternator it is necessary to act
on the potentiometer located on the regulator.Voltage increases with a clockwise rotation of the potentiometer.
Protections
The electronic regulator acts also as protection against overloads on exciting windings of the alternator when functioning at a
frequency lower than the nominal one, in case of overload or loads with low power factor. A first protection checks the frequency
of the output voltage and de-excites the alternator when it is lower than 46 Hz (56 Hz when nominal frequency is 60 Hz).
A second protection checks the voltage at the ends of the exciter stator and de-excites the alternator when this voltage is higher
than the intervention level set with the OL potentiometer. The intervention level can be increased with a clockwise rotation of
the potentiometer.
Frequency variation
- 10 -
Exciter
Excitation data
no load
2 POLES - 3000 and 3600 rpm
2.90
8.56
16.5
1.35
3.90
0.23
2.75
9.42
16.5
1.35
4.20
0.25
2.65
10.40
16.5
1.35
4.60
0.28
2.25
12.50
16.5
1.35
4.80
0.29
2.35
14.70
16.5
1.35
5.00
0.30
4 POLES - 1500 and 1800 rpm
4.25
5.73
16.5
2.40
9.15
0.55
4.00
6.60
16.5
2.40
9.20
0.56
3.60
8.40
16.5
2.40
8.95
0.54
2.90
9.46
16.5
2.40
10.40
0.63
3.10
11,20
16.5
2.40
10.20
0.62
Load cosfi = 0.8
18.20
1.10
17.10
1.03
18.70
1.13
17.50
1.10
17.70
1.10
22.70
1.37
22.10
1.34
25.20
1.53
28.00
1.70
26.50
1.61
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