TP-6774 2/14a 41Section 6 Troubleshooting
Problem ReferenceCorrective ActionPossible Cause
No output
voltage
AC output circuit breaker open Check for AC voltage on the generator side of circuit
breaker. If there is AC voltage on the generator side of
the breaker, then a problem in the load circuits is
causing the line circuit breaker to trip. Check for and
correct short circuits or overloading on the load side
before resetting the circuit breaker.
—
Alternator or control system Perform separate excitation procedure to isolate the
problem to the alternator or the control system. Then
troubleshoot the alternator or control system
components as follows.
Section 8.2
Aux. winding F1 fuse blown Replace blown fuse. If fuse blows again, check stator. Section 8.15
Section 8.9
Controller Check controller settings. Check wiring and
connections.
Section 7.13
Section 10
Open wiring, terminal, or pin in
buildup circuit
Check continuity. Section 8.16
Section 10
Brushes (6EKOD/5EFKOD
models)
Inspect brushes and replace if worn. Section 8.6
Check for brushes sticking in brush holder or broken
brush spring.
Section 8.6
Rotor connections Check for open circuit in rotor connection circuit (leads
FN and FP).
Section 8.8
Section 10
Rotor slip rings dirty or corroded
(6EKOD/5EFKOD models)
Check slip ring condition. Section 8.5
Rotor (open, grounded, or
shorted windings)
Check voltage and continuity. Section 8.8
Stator (open, grounded, or
shorted windings)
Check voltage and continuity. Section 8.9
Noisy
operation
Exhaust system leaks Check and replace as necessary. O/M
Engine not running smoothly See “Operates erratically,” this table. —
Broken or damaged
vibromount(s)
Check and replace as necessary. —
Loose or vibrating sheet
metal/housing
Retighten screws, replace rivets.
—
Exhaust piping or air
inlets/outlets not securely
installed
Inspect for loose parts and secure if necessary. —
Excessive engine/generator
vibration
Check the rotor, crankshaft, bearing, etc. (disassembly
of engine and/or alternator may be required).
Engine S/M
Emits
black or
gray
smoke
Oil level high Check the oil level. Generator set
O/M
Worn piston rings, valves, etc. Check compression. Engine S/M
High oil
use
External leakage/defective
gaskets
Replace gaskets. Engine S/M
Worn piston rings, valves, etc. Check compression. Engine S/M
Engine
knocks
Excessive load Reduce load. Generator set
I/M
Low oil level Check the oil level and add oil if low . Generator set
O/M
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