Doosan DX225LC, Manual

Page: 84 / 136

Electrical System
Page 83
SP000935
If the automatic travel speed control switch is set to the "OFF"
position, the travel motor will run in the I-speed (low speed)
range. If the selector switch is set to the "I" position, the travel
motor will run in the II-speed (high-speed) range. If the selector
switch is set to the "II" position, the e-EPOS controller will
monitor the main pump discharge pressure and automatically
select the "ON" - "OFF" status of the II-speed travel solenoid
valve based on the travel load. The travel speed is changed
between the I-speed and the II-speed mode.
The travel load is monitored by the two pressure sensors in the
discharge lines of the front (upper) and rear (lower) pumps.
When the travel load is high (pressure over 300 kg•cm
2
(4,300 psi) the solenoid valve is turned "OFF" and I-speed (low)
is selected. In the case when the travel load is low (pressure
under 160 kg•cm
2
(2,280 psi), the solenoid valve will be turned
"ON" and the II-speed will be selected. But, if the engine speed
control switch dial is set below approximately 1400 rpm, the
travel speed will be set to I-speed mode.