Hyundai Yanmar TNV Series Manual page 28

[Accelerator sensor]
• The Eco-governor has no governor lever unlike mechanical governors and uses voltage signals from the
accelerator sensor to set a target speed.
• If the engine speed is changed stepwise to constant values as in the case of generator engines, a panel
switch can be used to change the engine speed and the accelerator sensor is not needed.
• Using CAN communication permits a target engine speed to be specified from the E-ECU of the intended
machine. In such a case, the accelerator sensor is not needed.
[Coolant temperature sensor]
• Detects the coolant temperature to control CSD or EGR for cold start. Using the Yanmar genuine sensor
eliminates the possibility of using other devices in parallel.
[Panel switches and lamps]
• Enables options of the E-ECU to be used. If optional features are not needed, the corresponding switches
or lamps may be kept disconnected.
[About the starting aid]
• The circuit shown in Figure 2-4 allows the E-ECU to control the starting aid relay and provide ON-glow,
simultaneous energization or after-heating. The preheat lamp can be turned on when the starting aid is
energized during the ON-glow process.
• Even when the Eco-governor is used, preheating can be turned on or off with the key switch. In such a
case, the electrical circuit of the starting aid is the same as in the case where a mechanical governor is
used. See 6 "Cold-starting aid" for details.
• When the Eco-governor is used, after-heating as well as preheating can be turned on or off with the key
switch. In this case, the key switch with a "preheat" position and the air heater relay are required in the
starting aid circuit. See 6 "Cold-starting aid" for details.
[About a diode to be inserted in alternator terminal IG]
• The engine may be impossible to stop because the current generated by the alternator flows reversely
from alternator terminal IG to the harness circuit.
• To avoid such a trouble, you should separate alternator terminal IG from the rack actuator excitation circuit
or insert a diode (marked with an asterisk in Figure 2-4) into alternator terminal IG in order to prevent
reverse current from the terminal.
TNV Application Manual
CONTROL SYSTEM
2-9