4
REV A
OPM-119
INTRODUCTION
INTENDED USES
This engine generator set has been designed primarily for portable
heavy duty commercial use. Both 120 volt and 240 volt receptacles
are provided in the control panel to plug in your loads (lights, portable
tools, and small appliances). These units are dual wound generators,
therefore the 120 volt loads must be equally split with 1/2 of the rated
capacity available on each of the two 120 volt circuits.
This portable unit requires large quantities of fresh air for cooling the
engine and generator. 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 this generator in a small compartment.,
i.e. generator compartments of vehicles, motor homes or travel
trailers. These compartments will not allow enough free flow of fresh
air to reach the engine generator set for cooling and will cause the
unit to overheat, damaging both the engine and generator. Small
compartments will also develop hot spots where there is very little air
flow and may cause a fire.
UNIT CAPABILITIES
GENERATOR CONNECTIONS
120 Volt and 240 Volt receptacles are provided for connection to
various loads. The diagram below represents this 7,500 watt (starting
output) generator. A & B represent the 120 volt output legs of this
generator. Up to 3,360 watts at 120 volts (56 Amps) can be drawn from
the receptacles attached to either A or B output legs. This generator
is capable of producing 28 Amps of 240 volt current at C. Check the
appliance or tool nameplates for the current and voltage to insure
compatibility. Remember that power taken from C reduces the power
available at equally both A and B and vice versa.
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 starting current as
running current. Capacitor motors are easier to start and usually require
2 to 4 times as much starting current as running current. Repulsion
Induction motors are the easiest to start and require only 1 1/2 to 2 1/2
times as much starting as running current.
Most fractional horsepower motors take about the same amount
of current to run them whether they are Repulsion Induction (RI),
Capacitor (Cap), or Split-Phase (SP) type.
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-exciting generators respond to severe overloading differently than
utility power. 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.
5. CLEANLINESS -
Keep the generator and surrounding area clean.
A. Remove all grease, ice, snow or materials that create
slippery conditions around the unit.
B. Remove any rags or other materials that could create a
potential fire hazard.
C. Carefully clean up any gas or oil spills before starting the unit.
6. SERVICING EQUIPMENT -
All service, including the installation or replacement of service parts,
should be performed only by a qualified technician.
A. Use only factory approved repair parts.
B. Do not work on this equipment when fatigued.
C. Never remove the protective guards, covers, or receptacle
panels while the engine is running.
D. Use extreme caution when working on electrical components.
High output voltage from this equipment can cause serious
injury or death.
E. Always avoid hot mufflers, exhaust manifolds, and engine parts.
They can cause severe burns instantly.
F. The use of the engine-generator set must comply with all
national, state, and local codes.
PLEASE NOTE
There are 3rd party companies making enclosures for
generators that have been properly engineered. The use of these 3rd
party enclosures is acceptable as long as they have been certified and
meet current code.
DO NOT
attempt to operate at 50 cycles. These units are designed and
governed to operate at 60 cycles only.
