Download Service Manual, 4EOZ/3.5EFOZ (TP-6137)

8.1 General
8.1.1
The following section covers the controller
troubleshooting procedure. Refer to Figure 8-2 to
identify the controller components.
After pressing the On/Off switch on the control panel
(local or remote), two green LEDs and one red LED (oil
engine) light. This operation energizes the control panel
and permits DC to the K2 relay. This in turn energizes
the fuel solenoid (FS) and the fuel pump (FP) because
the normally open contacts of the K2 relay close.
1
2
3
8.1.2
4
6
7
12
11
10
8.1.3
VR
F2
BH1
9
DC supplied to the starter is interrupted, every starting
operation is eliminated.
F1
K2
LO TB1
K3
P1
P3
GRD
15
1.
2.
3.
4.
5.
6.
7.
8.
9.
Control panel
Hourmeter
On/off switch
Start switch
Green/red oil pressure
LEDs
Green/red engine water
temperature LEDs
Green/red exhaust
temperature LEDs
Control box
25 amp fuse
Figure 8-2
42
14
16
Run
After reaching correct engine and generator set
performance, the two generator set wires marked
10 and 11 energize the K3 relay (AC crank disconnect)
that opens its normally closed contacts.
8
K1
Start
Press the START switch (local or remote) the K1 relay
energizes. The normally open K1 contacts close
allowing DC to the normally open contacts of the starter
motor’s solenoid (S). The energized starter starts the
generator set’s engine.
5
13
On/Off Switch
17
10.
11.
12.
13.
14.
15.
16.
17.
18
10 amp fuse
Bridge rectifier
K1 relay
K2 relay
K3 relay
Engine voltage regulator
Electrical connection plate
Harness control box (to
engine connector)
18. Harness control box (to STD
panel connector)
Controller Internal Components
Section 8 Controller Troubleshooting
The generator set wires marked C1 and C2 connect at
the capacitor supplying AC. As it gives or receives
current in accordance with variable loads, its capacity
changes to hold the correct AC voltage value.
When good engine oil pressure operation is reached,
the normally closed contacts of the low oil pressure
(LOP) switch close. The red LED on the control panel
cuts off and the green LED lights.
If all three green LEDs on the control panel are lit at the
same time, good engine performance is achieved and
AC is supplied to the windings L1, L2, L3 and L4.
8.1.4
On/Off Switch (Stop)
If the On/Off switch (local or remote) is repressed, the K2
relay deenergizes. The fuel solenoid (FS) and fuel
pump (FP) do not receive DC, the normally open K2
contacts reopen and the engine stops.
TP-6137 5/03