Function Of Electronic Governor; Throttle Motor; Economy Control Operation And Features - Yamaha EF3000iSE New Model Manual

Functions of electronic governor
The inverter control unit is preprogrammed with the
ideal engine speed settings in relation to electrical cur-
rent output, and uses these settings as a cross-reference
with the detected current output to control the throttle
motor (and consequently the throttle valve) to adjust
engine speed to an optimum level. Therefore, the
engine speed will always be at the appropriate level
according to the load on the system.
With an inverter generator, even if the engine speed
changes it has no effect on the output frequency.
The electronic governor system is maintenance-free as
it cannot be adjusted externally.

Throttle motor

Caution during resistance measurement:
Do not allow the lead wire of the tester to touch the next
terminal when measuring the resistance between termi-
nals.
Caution during assembly:
To prevent damage to the throttle valve when reassem-
bling the carburetor, re-install the carburetor with the
throttle valve fully opened.
Caution:
If the engine is difficult to start after the carburetor is
installed onto the engine, make the throttle valve fully
opened by hand and then start the engine.

Economy control operation and features

Because output frequency of an inverter generator is
unrelated to the engine speed, it becomes possible to
utilize a wide range of engine speed.
Therefore, it also becomes possible to use low engine
speed to meet a low electrical consumption.
With the EF3000iSE, the control unit commands the
throttle motor built into the carburetor to control the
throttle valve, which gives it the ability to continuously
control the engine speed, which in turn makes the econ-
omy control system possible.
However, economy control switch should be turned off in case of the following occasions.
1. When operating an electric motor, such as water pump, which requires a large starting current.
2. When the changes in voltage cannot be accepted.
3. When charging batteries.
Resistance 250Ω
500Ω
Throttle valve position:
During assembly:
During engine starting: Open
Economy Control Characteristics
– 4 –
Terminal: F3-1, 3-5, 3-2, 3-4
Terminal: 1-5, 2-4
Close