TP-5606 6/025-2 Controller Troubleshooting
Running
During engine start-up, flashing current is provided to
the generator field through a normally open contact of
the K2 relay, two diodes, and the normally closed K1A
and K1B contacts. The flashing current plus the rotation
of generator rotor induce electrical currents in the
generator stator windings. The resulting generator
output from the B1/B2 stator winding, rectified and
regulated to a 12 VDC level, energizes the K1 relay
(LED1 lights). After a 5- to 10-second delay, the same
signal energizes the K5 relay (LED5 lights). Both relays
remain energized during normal running.
Energizing the K1 relay opens the normally closed K1A
and K1B contacts that supply flashing current to the
generator exciter field. Field current for continued
operation is then supplied by the voltage regulator,
operating from an input supplied by generator stator
winding 55/66.
Energizing the K1 relay also opens the normally closed
K1C contacts between the Start/Stop switch and the K2
relay in the engine start-up circuit. However, at the same
time, the normally open K1D contacts close to keep the
K2 relay energized in order to maintain operating power
for the other relays and hourmeter of the controller.
Energizing the K1 relay also opens the normally closed
K1E contacts to de-energize the K3 relay. As a result,
K20 and the S (Starter) solenoid de-energize to
disengage and de-energize the starter motor, even
when the Start/Stop switch is held in the Start position.
The other devices energized during engine starting, that
is the K25 relay, the K30 relay (and 12 VDC fan), the fuel
pump, and the fuel solenoid, remain energized to keep
the engine running and to supply excitation to the B.C.
Alt (battery-charging alternator).
Finally, energizing the K1 relay also closes the normally
open K1F contacts to activate the hourmeter, oil
pressure gauge, water temperature gauge, and battery
voltage gauge on an optional remote panel.
FROM SAFETY
SHUTDOWN
SWITCHES
K5
K4A
LED4
K4
K2
OP
WT
HR
K1A
10 A.
MAIN FIELD
L2
LO
LO
L1
VOLTAGE
REGULATOR
LED1 LED5
K1 K5
12 VDC
AIR HEATER
C1
M
FS
S
10 A.
K25
K30
FP
10 A.
START
STOP/
PREHEAT
K1C
K1D
K1E
K2
K3
K3
K2
K20
S
B.C.
ALT
LED3
LED2
C1
15 A.
K30
12VDC
FAN
K25
K4B
K20
HR
BV
GEN
ON
REMOTE PANEL
K1F
K1B
Figure 5-2. Single-Phase Generator Sequence of
Operation, Running
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