SYSTEM / Control System HP Mode Control Purpose: Slightly increases digging power such as arm roll-in operation while excavating deeply. Engine Speed Operation: 1. When the power mode switch is in the HP mode position and all the following conditions exist, MC sends the signals equivalent to the target engine speed to ECM by using CAN communication. 2. ECM slightly increases the engine speed set by the engine control dial. Condition: Engine Control Dial: Set at 1020 min -1 or faster. Boom Raise or Arm Roll-In Operation: Operated Average Delivery Pressure of Pumps 1 and 2: High 1210 min -1 Increasing Range of Fast Idle 1020 min -1 Engine Con- trol Dial Posi- tion Slow Idle Fast Idle NOTE:
HP mode control is deactivated by Dr. ZX temporarily or permanently. When HP mode is selected with HP mode deacti- vated, the engine speed can become 1800 min -1 by using the engine control dial. T2-2-8