Operator`s manual
GENERAL INFORMATION
AND
CARE
OF
THE
GENERATOR
Use
of
Electric Motors
The power required to start an electric motor
is
considerably more than is required to keep it running after
it
is
started. Some motors require much more current to start than others. Split-phase (AC) motors
require more current
to
start, under similar circumstances, than other types. They are commonly used on
easy-starting loads, such as washing machines,
or
where loads are applied after the motor is started, such
as small power tools. Because they require S
to
7 times as much current to start as
to
run, their use should
be avoided, whenever possible,
if
the electric motor is
to
be driven
by
a small generator. Capacitor and
repulsion-induction motors require from 2 to 4 times as much current to start as
to
run. The current
required
to
start any motor varies with the load connected to it.
An
electric motor connected
to
an air
compressor, for example, will require more than a motor
to
which no load
is
connected.
In general, the current required to start l1S-Volt motors connected medium starting loads will be
approximately as follows:
MOTOR
AMPS FOR
AMPS FOR
SIZE RUNNING STARTING
(HP) (Amperes) (Amperes)
1/6 3.2 6.4
to
22.4*
114
4.6
9.2
to 32.2*
113
S.2
10.4 to 72.8*
112
7.2 14.4 to 29.2
3/4 10.2 20.4 to 40.8
1
13
26
to 52
*Note that in the above table the maximum "Amps for Starting"
is
more for some small
motors than for larger ones. The reason for this
is
that the hardest starting types (split-
phase) are not made in larger sizes.
Because the heavy surge
of
current needed for starting motors
is
required for only an instant, the generator
will not be damaged
if
it can bring the motor up
to
speed in a
few
seconds.
If
difficulty
is
experienced in
starting motors, turn off all other electrical loads and,
if
possible, reduce the load on the electric motor.
Required
Operating
Speed
Although individual units may vary slightly, the normal voltage and frequency
of
typical 60-(50-) Hertz
engine-<iriven generators described in this manual are approximately as follows: run first with no load
applied, then at half the generator's capacity, and finally loaded
to
its full capacity as indicated on the
generator's data plate.
See the rpmlHertzifrequency chart
on
the next page.
73
WESTERBEKE
GENERATORS