ELECTRICAL
4 - 24
CX EXCAVATORS
ELECTRIC/HYDRAULIC
Pump Control, All Models
1) In S,H and Auto modes supply current to Electro-magnetic proportional solenoid valve on
the side of the pump, will control the HP requirement of hydraulic pumps P1 and P2.
Note: The controller needs a RPM signal for proportional solenoid pump control.
H -MODE: when pump torque amounts to 100% of engine target torque a variable electrical
signal is sent to the proportional solenoid. It varies with engine RPM.
S -MODE: when pump torque amounts to 95% of engine target torque a constant electrical
signal is sent to the proportional solenoid.
L -MODE: when pump torque amounts to 70% of engine target torque no electrical signal is
sent to the proportional solenoid.
AUTO -MODE: when pump torque varies between 90% to 93% of engine target torque. An
electrical signal is sent to the proportional solenoid based on the mode. The mode
switches between S
A
mode to L
A
mode depending on conditions. The current will
equal S mode + 40mA for S
A
to S mode for L
A
mode.
When operating in auto-mode and S
A
mode is active and the travel pressure switch is
activated (closed) the machine will stay in S
A
mode until the travel switch opens. If the
machine is in L
A
mode when the travel pressure switch closes the machine will stay in L
A
mode until the travel pressure switch opens.
When operating in L mode and the travel pressure switch closes the machine will operate
with the mA current of S mode. If the hammer pressure switch closes the machine will
operate with the mA current of S mode.
Engine revolutions must exceed approximately 1500 rpm’s before the controller sends
current to the pump proportional solenoid.
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