ELECTRICAL
4 - 16
CX EXCAVATORS
RPM CONTROL
RPM Control for Automatic Work Mode, CX130/CX160
1) When the key switch is turned “ON” the machine will be in Auto mode.
2) With “Auto” mode selected the machine operates in 2 modes, S
A
and L
A
depending on
conditions.
3) Switching to other work modes can not be done with “Auto” mode on.
Auto mode speed varies, 150 rpm less than “H” mode to 250 rpm less than “H” mode. The
current value for the proportional solenoid also varies as the mode changes. The range for
each model is “S” mode value and “S” mode value +40. The controller uses information from
the pump pressure transducers to determine when to switch modes. The controller monitors
both main pump pressures and the de-stroke (negative control) signal coming from the arm
side of the main control valve to the pump for that side of the valve (pump2 for the
CX130/CX160 and pump1 for the CX210/CX240). When either pump pressures rises above
3625 psi and the de-stroke signal for the pump for the arm is less than 87 psi the controller
switches to S
A
mode. When the pump pressures fall below 3625 psi or the de-stroke signal
rises to above 87 psi the controller will switch to L
A
mode. If the engine coolant solution
temperature is below 122°F or the oil temperature below 77°F, auto mode control does not
operate and L
A
mode is selected. When the water temperature is above 122°F and the oil
temperature above 77°F, auto mode starts and continues operating even if the water and oil
temperatures fall. When auto mode control is operating, if the travel pressure switch is
operated, the mode change does not take place. If the travel pressure switch is operated in
S
A
mode, the system stays in S
A
mode and if the pressure switch is operated in L
A
mode, the
system stays in L
A
mode.
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