Fiat Kobelco EX355 Tier2, Technical Manual

Page: 61 / 968

T2-3-14 EX355
ELECTRICAL SYSTEM
Power Generation
The alternator consists of field coil FC, stator coil SC,
and diodes D.
The regulator consists of transistors T1 and T2, zener
diode ZD, and resistors R1 and R2.
Alternator terminal B is connected to:
B
→
R
→
RF
→
(R)
→
R1
→
Base B for Transistor T1
When the key switch BS is turned ON, the battery
voltage flows to base B for transistor T1 in the regu-
lator, allowing current to flow from collector C to
emitter E.
Accordingly, field coil FC is grounded through transis-
tor T1.
At first, the current does not flow to field coil FC.
When the rotor starts to rotate, alternating voltage is
generated in stator coil SC due to residual magnetism
in the rotor.
Thereby, the current starts to flow through field coil
FC, magnetizing the rotor further and increasing
generating voltage.
As generating voltage increases, the flowing current
through field coil FC is increased further, causing the
generating voltage to increase more. Thus, the batter-
ies are recharged.
SM4056A
Alternator
BS
(R)
SC
FC
Regulator
D
B R L
RF
R
3
R
4
R
5
R
2
ZD
R
6
B
R
1
D
1
(F)
(E)
E
E
T
2
T
1
B
C
E
Batteries
C
Monitor