Yamaha EF4500iSE Theory & Diagnostics Manual page 24

Yamaha Generator Theory & Diagnostics Guide
No Fuse Breaker (NFB)
Sometimes called a Non Fuse Breaker, this device
acts like a fuse to interrupt power in the event of a
sudden spike or surge in current. Unlike a fuse, how-
ever, the NFB can be reset.
Electronic Breaker
An electronic circuit breaker automatically cuts off
the current when the output voltage exceeds the
maximum capacity.
Smart-Throttle
Because output frequency of an Inverter Generator
is unrelated to engine rpm it becomes possible to
utilize a wide range of engine rpm. This feature
helps quiet running by choosing the minimum
engine rpm necessary for the actual electrical load.
A double coil system such as on the EF1000iS
makes possible a higher output even at a low rpm
setting. Smart Throttle ONLY applies to inverter
models that have an electronic throttle servo motor
to control engine speed.
Economy Control (also called Economy Idle)
Conventional generators, and in some cases inverter
generators use economy control / idle. This function
causes the unit to idle down when a load is not pres-
ent.
Ground Fault Interruption (GFI)
Shuts down the power when a fault to ground is
detected. A device that interrupts the power flowing
through a GFI receptacle when a proper ground/
earth ground is not present or a short were to take
place - to prevent electrocution
Right Sizing and Power Management:
Determining Your Consumer Series Customer's
Energy Needs
When selling a generator, it is important to select
one that is capable of meeting the energy require-
ments of the customer. Match the rated output of
the generator to the maximum anticipated power
demand.
This section will assist in estimating the power
requirements, so the purchase will satisfy the needs.
Make a list of the appliances and devices or tools
that you expect to operate, as well as the approxi-
mate power requirements for each device.
After making the list, estimate the highest demand
on the generator under the "worstcase" conditions.
With this figure, determine the appropriate model
Yamaha generator for your particular needs.
WARNING
Electrocution, severe personal injury or death
can occur: Do not connect any generator to any
building's electrical system unless an isolation
switch has been installed by a licensed electri-
cian . Refer to the Generator Owner's Manual .
Property damage can occur: Do not connect any
generator to any building's electrical system
unless an isolation switch has been installed by
a licensed electrician . Refer to the Generator
Owner's Manual .
Take It Step-By-Step
Follow these steps when determining your energy
needs:
1. Identify the wattage requirements for the tools
and appliances that you want to power. The
power requirements for the tool or appliance are
found on its identification plate or in the Owner's
Manual. If the power requirement is given in
amps, multiply the amps times volts to derive
the required watts.
Amps x Volts = Watts
2. Add up the required watts of all the tools and
appliances you expect to operate simultane-
ously.
3. The total watts derived in step 2 equals the size
Yamaha generator you need. These three sim-
ple steps will "size" a generator. However, you
must keep in mind that devices with electric
motors require at least 2-3 times their running
wattage for start-up power. This multiplier varies
with the age, type, and condition of the electric
motor. A good "rule of thumb" to use for this is
Horse Power multiplied by 932 usually equals a
motor's starting wattage (HP x 932 = SW).
The chart on the next page lets you immediately
add up all of the appliances you will most likely uti-
lize:
1-20