Doosan DX225LC, Manual

Page: 63 / 136

Electrical System SP000935
Page 62
2. Standard Mode
Standard Mode is used for general work. When this mode
is selected it will reduce noise and fuel consumption in
comparison with Power Mode. The current to the E.P.P.R.
valve is shut off and pump discharge volume is controlled
by pump regulator.
3) Operation in case of failure in the control system (Aux
mode operation
Though it is impossible to control current of the E.P.P.R
(Electromagnetic Proportional Pressure Reducing) Valve
controlling the discharge volume of pump because of fault in
control system, the machine can be operated in the aux mode.
Upon turning "ON" the aux mode switch, the E.P.P.R Valve
controlling the discharge volume of pump comes into contact
with the aux mode resistor to let current of a certain value flow.
At this time, the discharge volume of pump follow the control by
the pump regulator, nearly at quantity roughly similar to that in
the standard mode.
B D
C A
FG000581
Figure 54
Reference
Number
Description
A Engine Horsepower (hp)
B Engine Speed (rpm)
C Pump Discharge Volume (lpm)
D
Pump Discharge Pressure (kg•cm
2
)
Reference
Number
Description