Specifications
5.0KW
BC
GENERATOR
TROUBLESHOOTING
This
troubleshooting chart
is
designed
to
give
insight into
problems
which
may
be
encountered
with
BT
brushless
generators operating
on
compound transformer regulation.
Owing
to
the
simplicity of
the
equipment
and
controls,
troubleshooting is relatively
easy,
once
the
relationship
between
cause
and effect
is
understood.
WESTERBEKE
recommends
that
the
troubleshooting
and
repair of
the
generator be performed
by
a qualified technician
with
a thorough
knowledge
of electricity
and
the
safety
procedures necessary
when
dealing
with
high
voltages.
Problem
Probable
Cause
Only
a
few
basic
tools
are
necessary for
diagnosis
and
repair.
These
are
hand
tools:
an
amp
probe and a
quality
volt-ohm-
meter capable of reading
less
than one
ohm
due
to
the
precision required
in
reading component
winding
resistances.
Before·attempting
any
repairs, get a clear
an
explanation of
the
problem
as
possible, preferably from
an
individual
witnessing
the
problem.
In
some cases,
this
may
bring
to
light a problem
which
is
related to the
method
of operation
rather
than
equipment
fault.
Have basic repair
parts
available,
such
as:
diodes
and
a bridge rectifier,
so
that if
the
problem
is
found
in
one
of these easily replaceable
parts,
repairs
can
1]e
made
efficiently.
VerlflcationJRemedy
No
AC
Output
at
No
load.
1.
Main
stator
winding
is
open
or
shorted.
1.
Excite
unit
with
12
VDC.
Check
the
stator
windings.
ReSidual
voltage
(4
- 6
Volts)
at
NIL.
1.
Faulty
capaCitor.
1.
Perform
capacitor
check.
2.
Faulty
electrical
connections.
2.
Check
all
electrical
connections,
ensure
they
are
clean
and
tight.
3.
Engine
speed
is
too
slow.
3.
Adjust
engine
speed
to
correct
NIL
hertz.
4.
Faulty
exciter
winding.
4.
Check
winding
resistance
value.
Check
winding
residual
voltage
output..
High
No
Load
voltage
output.
1.
Engine
speed
is
too
fast.
1.
Adjust
engine
speed
to
correct
no
load
hertz.
2.
No
load
voltage
tap
at
capacitor
.
2.
Change
tap
to
lower
number.
..
..
3.
Wrong
hertz
tap.
3.
Check
to
ensure
correct
hertz
tap
attached.
Correct
No
Load
voltage,
voltage
drops
1.
Faulty
diode.
1.
Isolate
diodes
and
check
for
short.
to
60
-
80
volts
when
load
applied.
2.
Poor
governor
reaction.
2.
Check
engine
speed
under
load.
Adjust
or
repair
governor
as
needed.
3.
Overload
on
generator.
3.
Check
the
engine
speed.
Monitor
amperage
draw
with
amprobe.
Correct
No
Load
voltage,
high
voltage
1.
Engine
speed
is
too
fast.
1.
Check
engine
speed.
Adjust
or
repair
governor
as
needed.
Unstable
voltage
output.
1.
Poor
governor
reaction.
1.
Check
the
governor.
Adjust
or
repair
the
governor
as
needed.
2.
Loose
electrical
connections.
2.
Check
the
security
and
cleanliness
of
the
electrical
connections.
Noisy
Generator.
1.
Rear
support
bearing
faulty.
1.
Inspect
rear
bearing.
2.
Unbalanced
load
(1201240
wired).
2.
Monitor
the
amperage
draw
from
each
leg
using
amprobe.
3.
Generator
rotor
connection
3.
Check
rotor
security.
to
engine
is
loose.
Engines & Generators
47