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60707-101
DYNA SERIES
Starting Electric Motors - Electric motors require much more
current (amps) to start them than to run them. Some
motors, particularly low cost split-phase motors, are very
hard to start and require 5 to 7 times as much current to
start them as to run them. Capacitor motors are easier to
start and usually require 2 to 4 times as much current to
start them as to run them. Repulsion Induction motors are
the easiest to start and usually require 1 1/2 to 2 1/2 times
as much to start them as to run them.
Most fractional horsepower motors take about the same
amount of current to run them whether they are of
Repulsion-Induction (RI), Capacitor (Cap), or Split-Phase
(SP) type. The chart below shows the approximate current
required to start and run various types and sizes of 120 volt
60 cycle electric motors under average load conditions.
RUNNING
STARTING AMPS
HP AMPS
SP
CAP
RI
1/6
3.2
16 TO 22
6 TO 13
5 TO 8
1/4
4.5
22 TO 32
9 TO 18
7 TO 12
1/3
5.2
26 TO 35
10 TO 21
8 TO 17
1/2
7.2
NOT MADE
14 TO 29
11 TO 18
1
13.0 NOT MADE
26 TO 52
20 TO 33
The figures given above are for an average load such as a
blower or fan. If the electric motor is connected to a hard
starting load such as an air compressor, it will require
more starting current. If it is connected to a light load, or no
load such as a power saw, it will require less starting
current. The exact requirement will also vary with the brand
or design of the motor.
Self-excited generators respond to severe overloading
differently than the power line. When overloaded, the
engine is not able to supply enough power to bring the
electric motor up to operating speed. The generator
responds with high initial starting current, but the engine
speed drops sharply. The overload may stall the engine. If
allowed to operate at very low speeds, the electric motor
starting winding will burn out in a short time. The generator
winding might also be damaged.
CAUTION: EQUIPMENT DAMAGE
RUNNING THE GENERATOR SET UNDER THESE
CONDITIONS MAY RESULT IN DAMAGING THE
GENERATOR STATOR AS WELL AS THE MOTOR
WINDING.
Because the heavy surge of current required 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 of time. If difficulty is experienced in starting
motors, turn all other electrical loads off and if possible
reduce the load on the electric motor.
UNPACKING
CAUTION: EQUIPMENT DAMAGE
THIS UNIT HAS BEEN SHIPPED WITHOUT OIL. Failure to
maintain the engine oil at the proper level will result in
serious engine damage.
These portable units require large quantities of fresh air for
cooling of both the engine and the generator. Fresh air is
drawn from both the engine end and the generator end
and is exhausted at the center of the unit. For safety, long
life and adequate performance, these units should never
be run in small compartments without positive fresh air
flow.
RESTRICTED USES
DO NOT remove from the cradle assembly. Removal of the
generator from the cradle assembly may cause
excessive vibration and damage to the engine generator
set.
DO NOT install and operate these portable generators in a
small compartment., i.e. generator compartment of
vehicles, motor homes or travel trailers. These
compartments will not allow enough free flow fresh air to
reach the engine generator set for cooling and will
cause the unit to overheat damaging both the engine and
the generator. Small compartments will also develop hot
spots where there is very little air flow and may cause a
fire.
DO NOT attempt to operate at 50 cycles. These units are
designed and governed to operate at 60 Cycles only.
UNIT CAPABILITIES
Generator Connections - The diagram below represents a
typical 4000 watt generator. Receptacles A and B are the
two 120 Volt duplex receptacles. Up to 2000 watts at 120
volts (16.6 Amps) can be taken from the generator at
each of the receptacles. This generator produces 120
and 240 volt, 60 Hz (Hertz), AC (Alternating Current).
CAUTION: EQUIPMENT DAMAGE
CAUTION MUST BE EXERCISED TO PREVENT
OVERLOADING EITHER OF THE GENERATOR 120
VOLT OUTPUT CIRCUITS (A OR B).
Check the appliance or tool nameplates for the current and
voltage to insure compatibility. Remember that power
taken from receptacle C reduces the power available at
both A and B. Any remaining 120 volt loads should be
equally divided between A and B. Failure to split the load
will cause permanent damage to the stator. Although
circuit breakers are provided, damage due to overloading
constitutes abuse and will not be warranted. Refer to the
generator nameplate for your unit's capabilities.
BASIC INFORMATION
