Komatsu PC500LC-10R Shop Manual page 194

ENGINE AND PUMP COMBINED CONTROL SYSTEM
Control function when the machine travels
• When the machine travels in mode E, ATT-E, or B, the
working mode is kept as it is, and the pump absorption tor-
que and engine speed (N) increase as in traveling in mode
P.
• When the machine travels in mode L, the working mode is
kept as it is, the engine speed (N) is kept as it is but the
pump absorption torque increases.
Control function when the pump secondary drive switch is in "ON" position
The pump secondary drive switch (1) is a switch that enables the temporary work to be done with absorption
torque equivalent to E mode for the time when an abnormality occurs in the controller, etc., the main pump does
not operate normally, and the machine does not work. Only PC-EPC valve senses the oil pressure since a con-
stant current flows from the battery to PC-EPC valve at this time.
REMARK
The pump secondary drive switch (1) is an alternative type. Action level L03 appears on the display if the ma-
chine is operated with this switch at emergency (a) position while the machine is normal.
10-100
10 STRUCTURE AND FUNCTION
PC500LC-10R