5
REV C
60706-220
UNIT CAPABILITIES
GENERATOR CONNECTIONS
W3000H: 120 volt receptacles are provided for connection to various
loads. The following diagram represents this 2,400 watt (rated output)
generator. This generator is capable of producing 20 Amps of 120 volt
current at A. Check the appliance or tool nameplates for the current
and voltage to insure compatibility.
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. The following chart shows
the approximate current required to start and run various types
and sizes of 120 Volt 60 cycle electric motors under average load
conditions.
STARTING AMPS
HP
Running
Amps
Split Phase
Motor
Capacitor
Motor
Repulsion
Induction Motor
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
Not Made
26 to 52
20 to 33
The figures given in the previous chart 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-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 may also be damaged.
A
RECEPTACLES
120 VOLTS
CAUTION: EQUIPMENT DAMAGE
Running the generator set under these conditions may result in
damage to the generator stator as well as the motor winding.
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.
Motor starting capacity - 0.75 HP code ‘G’ capacitor start engine.
Trying to start a larger motor or higher code motor, i.e. ‘J’ or ‘K’,
may result in damage to both the generator and the electric motor,
especially 120 Volt motors.
LOAD TYPES
This generator is designed and rated for general commercial use. The
running watts rating assumes a variable load. If your application has
a fixed load that does not vary, an additional derate of 20% from the
running watts is recommended to ensure the longest useful life of the
engine and generator end.
