Linz electric SP - E1C Mode D'emploi Et D'entretien page 11

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.
Battery charger circuit
The SP10 and E1C/2 series alternators can be equipped with a battery charger circuit which supplies a maximum
current of 10 A. The rectifier bridge of the battery charger is usually selected for 600 V.-10 A.
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 fig. 8 (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 10000
hours. Should you proceed with the overhaul of the genset, it is advisable washing the bearings with a suitable
solvent.
BEARING TYPE
Alternator
SP10
E1C10
E1C11
E1C13
Drive-end side Opposite drive-end side
6204-2Z-C3
6305-DDU-C3E 6204-2Z-C3
6207-2Z-C3 6205-2Z-C3
6208-2Z-C3 6305-DDU-C3E
FAULT CAUSE
Low voltage with 1) Too low drive engine RPM
no-load
2) Faulty rectifying diode bridge
3) Capacitor with low capacitance
4) Winding fault
High voltage 1) Capacitor with too high capacitance
with no-load
2) Too high drive engine RPM
Alternator does 1) Too low drive engine RPM
not excite
2) Connection failure
3) Capacitor failure
4) Windings failure
5) Rectifying diode bridge failure
Correct voltage 1) Rectifying diode bridge failure
with no-load but
2) Low revolving speed at full load
too low voltage
3) Load is too high
on load
4) Load PF is too low
Noisy working 1) Bad coupling
2) Short circuit in windings or load
3) Faulty bearing
Unstable voltage 1) Uneven engine rotation
2) Poor contact within connections
3) Irregular load
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ACTION
1) Reset nominal speed for drive engine
2) Replace rectifying diode bridge
3) Increase capacitor' s capacitance
4) Check resistance and replace damaged part
1) Reduce capacitor' s capacitance
2) Reset nominal speed for drive engine
1) Reset nominal speed for drive engine
2) Check wiring diagram and reset correct connections
3) Replace capacitor
4) Check winding resistance and replace damaged part
5) Replace rectifying diode bridge
1) Replace rectifying diode bridge
2) Adjust governor control to nominal speed
3) Reduce current supplied
4) Wire a capacitor in parallel with the lowest PF load
1) Check and correct coupling
2) Check windings and loads, and change faulty ones
3) Replace faulty bearing
1) Check drive engine and fix
2) Check and tighten faulty connections
3) Check loads and remove irregular one