Electronic Breaker - Yamaha EF3000iSE New Model Manual

I Momentary voltage drop:
However, the momentary voltage drop occurs, when large electric load is turned on.
This is caused by the fact that the electric energy stored in the condenser runs short momentarily until the
engine speed picks up to sufficient engine speed to compensate the energy shortage in the condenser.
The ratio of such momentary voltage drop and the rated voltage is defined as momentary voltage drop rate.
The momentary voltage drop rate of EF3000iSE is less than 20 %.
Naturally, the smaller the load capacity is applied, the smaller the momentary voltage drop becomes.
In case of incandescent lamps, large amount of rush current flows in the moment it is switched on. The rush
current may be as large as 10 times the rated current of the lamp. Therefore, when a large wattage incandes-
cent lamp(s) is switched on, the momentary voltage drop is greater.
I Settling Time:
It takes some duration to compensate the voltage from the momentary voltage drop by revving up the engine.
This duration is called settling time. In case of an EF3000iSE, the settling time is shorter than 2 seconds, when
a maximum rated load is turned on.
Electronic beaker
As opposed to the NFB used in synchronous type gen-
erators, the EF3000iSE uses an electronic breaker cir-
cuit housed in the control unit. When output from the
control unit exceeds a specific limit, output is automat-
ically interrupted to protect the generator from damage.
The control unit is designed to continuously monitor
the output current for overloads, and if the current over-
load continues longer than a specified time, output is
interrupted.
When using induction motors or similar devices (such
as underwater pumps) which require a large starting
Characteristics of Electronic Breaker
current with the generator, the current will not be inter-
rupted even if the starting current exceeds several times
the generator's rated output. Only when the large over current continues longer than a specified time, the con-
trol unit will interrupt the circuit, and in this way it resembles a mechanical NFB.
The engine must be stopped and power interrupted to the control unit in order for the system to reset after the
electronic breaker has activated.
An AC switch is not provided on the EF3000iSE, as it does not use a conventional magnetic type NFB.
Be sure the power switches on devices are OFF before connecting them to the EF3000iSE. After starting the
generator and the engine has warmed up, turn on the connected devices.
If a device's power switch is ON when it is connected the generator and the generator is subsequently started,
the device may unexpectedly activate or start up as a result, creating a potentially dangerous situation.
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