Linz electric ALUMEN Mode D'emploi Et D'entretien page 12

VOLTAGE AND REVOLVING SPEED CALIBRATION
Voltage and revolving speed calibration should be carried out by qualified personnel only
because of electrocution hazard.
The alternator's output voltage measurement should be carried out at the nominal revolving speed.
Small deviations of the outlet voltage can depend on the fact that the revolving speed is different from the
nominal one.
Keep into account that the output voltage changes proportionally to the squared revolving speed variation, at
nominal speed. If the output voltage needs to be adjusted, (with the alternator locked out) it will be necessary to:
a) increase the capacitor's excitation capacity to increase voltage;
b) decrease the capacitor's excitation capacity to decrease voltage.
Excitation of alternator
As a result of disassembling operations, or because of some unusual failure, the alternator can loose its
excitation. In such a case, after it has been coupled to the drive engine, it is necessary to excite the alternator
by applying a 12 Vdc voltage to the output terminals (only for the time necessary for the excitation and with
the alternator set at nominal speed).
It is advisable to connect a 10 A - 250 V fuse in series to one of the two wires going from the batteries to the
output terminals.
Rotating rectifier assembly inspection
The best way to check the rotating diodes is using a battery and a bulb so that the diode does not need
to be disconnected from its winding.
Using a 12 V battery and a «driving beam» type bulb (about 50 W), you will need to arrange the two connections
as shown below, and the bulb should light up smoothly when connected as illustrated in Figure 6 (A: lamp ON,
B: lamp OUT).
Bearings
The bearings of the alternators are self lubrificated therefore they do not require maintenance for a period of
more than 30000 hours. Should you proceed with the overhaul of the genset, it is advisable washing
the bearings with a suitable solvent.
BEARING TYPE
Alternator
ALUMEN
ELECTRICAL SYSTEMS
SINGLE VOLTAGE
(V230-50, or V120-60, or V240-60...)
DOUBLE VOLTAGE (V115/230-50, or 120/240-60...)
ALUMEN DUO (V115/230-50, or 120/240-60...)
Opposite drive-end side
6305-DDU-C3E
A) Main winding - B) Excitation winding - D) Rotor
A) 1, 2, 3 and 4 are terminals to be used for operation at 1500RPM/1800RPM
B) 1 and 5 are the terminals to be used for operation at 1350RPM
- 12 -
D
D
VARISTOR
B
DIODE
4
3
A
2
1
D
B
VARISTOR
DIODE
5
4
A
2 3
1
VARISTOR
DIODE
B
4
A
1
V
23
4
5
1
@ 1350 RPM
7