Yamaha EDL7000SE Owner's Manual page 29

8 Connecting a motor.
When starting the motor, the voltage drops
immediately. The circuit may be opened if an
electromagnetic switch is connected to the same
circuit. When connecting two motors or more,
make sure the total current capacity of the motors
does not exceed the total rated current.
8 Connecting to lights and electric heaters.
When connecting to lights or electric heaters, the
generator can be used up to the rated capacity.
When using a single phase, it can be used up to
the rated current.
8 Power factor calculations.
The power factor calculation is used to determine
input of the electrical devices.
AC devices
Electric power (W)
= Voltage (V) × Current (A) ÷ Power factor
Power factors of commonly used devices are listed in
the following table.
Load type
Single-phase induction motors
Electric heaters, incandescent
lamps
Commutator motor
Fluorescent lamps, mercury
lamps
AC arc welder
8 Ordinarily, a motor is rated in kW. This does not
refer to motor output.
Motor input (kVA)
Motor output (kW)
=
Motor efficiency × power factor
TIP
8 If a lighting system is employed together with some
types of computers and inverter air-conditioners
and/or the regulated power supply for TV sets, the
lights might suffer flickering. This phenomenon
does not indicate a fault of the generator: it is
caused by poor matching between the above-
mentioned regulated power supply and the
generator's automatic voltage regulator. In such a
case, modify the load combination to eliminate the
flickering.
PREPARATION TO SUPPLY THE ELECTRIC POWER
Power factor
0.4 to 0.75
1.0
0.8 to 0.95
0.4 to 0.9
0.4 to 0.6
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