TP-6356 4/1228 Section 2 Decision-Makerr 1 Troubleshooting
Function Relay
Relay Contact
Normal Position
Relay Contact
Action
Energizes/Action:
Starting: Place the generator set master switch
in the RUN position or AUTO position with
contacts 3 and 4 closed. The generator set
master switch closes contacts between N
and 47.
Note: Fault shutdowns are inhibited during
startup until K3 energizes.
K2 relay and LED2 lights
K2 Open Close
K10 relay, engine components (fuel
system, governor, ignition, etc.), K4
relay, and LED4 lights
K10 Open Close Hourmeter
K4 Open Close K20 relay
K20 Open Close
Starter solenoid (SS) relay and starter
motor (SM)
Running: Alternator winding V0--V7 (P1-12 and
P1-15) produces AC output.
Note: K3 relay must obtain AC output within
30 seconds or overcrank fault occurs.
K3 relay and LED3 lights
K3 Closed Open
Deenergizes K4 relay and LED4
deenergizes
K4 Open Open
Deenergizes starter solenoid (SS) and
starter motor (SM)
Stopping: Place the generator set master
switch to the OFF position to open circuit
between N and 47.
Deenergizes K2 relay and LED2
deenergizes
K2 Open Open
Deenergizes engine components;
generator set shuts down
Fault shutdowns: Low oil pressure (LOP), high
coolant temperature (HCT). Contacts close
5--8 seconds after reaching shutdown level.
Note: The fault shutdown latches (K5) to keep
the fault lamp lit. Move the generator set master
switch to OFF/RESET.
K1 relay, LED1 lights, and fault lamp
K1 Closed Open
Deenergizes engine components;
generator set shuts down
Fault shutdown: Overspeed (OS). Contacts
close when engine speed reaches shutdown
level.
Note: The fault shutdown latches (K5) to keep
fault lamp lit. Move the generator set master
switch to OFF/RESET.
K1 relay, LED1 lights, and fault lamp
K1 Closed Open
Deenergizes engine components;
generator set shuts down
Fault shutdown: Overcrank (OC). Contacts
close on overcrank (locked rotor) if the speed
sensor signal is absent longer than 30 seconds.
Note: The fault shutdown latches to keep the
fault lamp lit. Move the generator set master
switch to OFF/RESET.
K1 relay, LED1 lights, and fault lamp
K1 Closed Open
Deenergizes engine components;
generator set shuts down
Figure 2-2 Relay Controller Sequence of Operation
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