Operator`s manual
GENERAL INFORMATION AND CARE OF THE GENERATOR
Use
01
Electric
Molars
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. These motors 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 5
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 repul-
sion-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 current than a
motor
to
which
no
load is connected.
In general, the current required
to
start 120-volt motors connected
to
medium starting loads will be ap-
proximately as
follows:
MOTOR AMPS FOR AMPS FOR
SIZE RUNNING STARTING
(HP)
(Amperes)
(Amperes)
1/6 3.2 6.4
to
22.4"
1/4
4.6 9.2
to
32.2*
1/3 5.2 10.4
to
72.8"
1/2 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 start-
ing 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-
driven generators described
in
this manual are shown on the chart on the next page.
Run
the
generator
at
first
'vvith
no
load
applied,
theil
at
half
the
generator's
capacity,
and
finaiiy
loaded
to
its
full capacity as indicated on the generator's data plate.
See the rpm/hertz/frequency chart on the next page.
57
Weslerbeke
Generators