BT
GENERATOR
TROUBLESHOOTING
CHARTS
PREUMINARY
CHECKING
Before electrical testing check for proper engine speed/hertz
adjustment. Low engine speed will
cause
low
AC
voltage
output, high engine speed-high AC output.
Due
to
the simplicity
of
the generators design troubleshooting
is relatively simple
and
field testing and repairing can be
accomplished with basic tools and repair
parts which should
include the following:
Before testing, get a clear explanation
of
the problem that
exists, be certain it relates to generator components.
A
quality
multimeter (multitester) capable
of
reading less
than
one
ohm
and
with a specific diode testing function.
Basic
electrical
tools including cutters, soldering iron, wire
stripper/crimper, terminals connectors, etc.
Repair
parts
such
as diodes, suppressors, fuses, bridge
rectifier, etc.
TROUBLESHOOTING
SEQUENCE
The
bald letters and numbers refer to the components
of
the internal wiring
· · schematics and also to
the
component resistance charts in the following pages
LOW
VOLTAGE (60·100 VOLTS.AC/60Hz ·115·200VOLTSI50Hz)
TEST COMPONENTS IN THE FOLLOWING ORDER:
F Selector Switch
(6
stud only)
B Exciter Rotor:
2 Diodes (6}, 3 Field Windings, 1 Exciter Windings
abc
A Exciter Stator Windings 1·1+2
NO
AC
VOLTAGE OUTPUT (EXTREMELY
LOW
VOLTAGE
1·5
VOLTS)
TEST COMPONENTS
IN
THE FOLLOWING ORDER:
C Main Stator Windings 1 +2
B Thermister 4
2 Diodes (4-6 open/shorted}
D Compound Transformer Winding 1+2
B Rotor Field Winding 3
RESIDUAL
VOLTAGE
TEST
COMPONENTS
IN
THE
FOLLOWING ORDER:
A Exciter Stator Windings 1-1+2
G Bridge Rectifier
D Transformer Aux. Winding 3
C Main Stator Aux. Winding 3
Cbeck
Also:
Circuit connections from the transformer
to the connections
on
the Bridge Rectifier.
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