Specifications
7.6KW
BT·
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 be
made
efficiently.
VerificationJRemedy
High
voltage
(125
-135
volts)
at
NIL
with
1.
Generator's
engine
speed
(rpm)
high
at
NIL.
1.
Check
NIL
speed
and
adjust
NIL
voltage.
correct
voltage
when
loaded
(115
-120
volts).
High
voltage
at
NIL
and
F/L.
1.
Generator's
engine
speed
(rpm)
high.
1.
Check
NIL
rpm
and
adjust
NIL
voltage.
2.
Short
in
compound
transformer
auxiliary
2.
Check
continuity
and
connections
of
0-3
windings.
windings
0-3.
Low
voltage
(0
- 5
volts)
at
NIL
with
1.
Main
stator
windings
shorted
C-1, C-2.
1.
Check
continuity
and
resistance
values
of
C-1,
C-2
windings
growling
noise
from
generator
and
loss
of
and
connections.
engine
speed
when
load
is
applied.
2.
Compound
transformer
windings
shorted
2.
Check
continuity
and
resistance
values
of
0-1,
0-2
windings.
0-1,0-2.
Generator
does
not
excite;
voltage
is
1.
Generator's
engine
speed
is
slow.
1.
Adjust
the
engine's
speed
and
adjust
NIL
voltage.
is
0
volts
at
NIL.
2.
Short
in
the
main
stator
windings
or
2.
Check
the
diodes
as
shown
in
this
manual.
transformer.
3.
Shorted
Posi-resistor.
3.
Test
Posi-resistor.
Low
voltage
(60
-
100
volts)
at
NIL,
when
1.
Oiodes(s)
in
rotating
exciter
(B-2)
shorted.
1.
Check
B-1
and
B-2
in
the
rotating
exciter
as
explained
in
load
is
applied,
voltage
drops.
this
section.
2.
Rotating
field
windings.
2.
Check
for
short.
3.
Exciter
rotor
windings.
3.
Check
for
short
a,
b,
c.
4.
Exciter
stator
windings.
4.
Check
for
short.
Voltage
correct
at
NIL,
but
not
at
FIL
with
1.
Generator
overload.
1.
Monitor
the
load.
loss
of
engine
rpm
(hertz).
2.
Rotating
diode
failing.
2.
Check
the
diode.
3.
Generator's
engine
speed
is
low.
3.
Check
the
governor
operation.
4.
Low
power
load
factor.
4.
Check
the
type
of
load
applied.
Consider
use
of
optional
regulator
board.
Unstable
voltage.
1.
Engine's
rpm
fluctuating.
1.
Check
the
engine
operation
and
the
fuel
system.
See
ENGINE
ADJUSTMENTS.
Residual
Voltage
(18
-
22
volts)
1.
Bridge
rectifier.
1.
Test
rectifier.
2.
Exciter
stator.
2.
Test
winding
for
open.
3.
Transformer
windings.
3.
Test
winding
for
open.
4.
Main
stator
sux.
windings.
4.
Test
winding
for
open.
Engines & Generators
38