Volvo Truck Repair Guide

Volvo EC330B Excavator Safe Start and Stop Control Overview Safe start and stop control The optimal condition of engine start and stop is automatically set by this function. The engine can be protected from damages that may occur at engine start and stop condition. Volvo Vocom 1 1. During starting engine, Engine rpm is fixed to low idle (I2) regardless of engine rpm control switch position to protect engine from sudden rpm increase in cold period or other situation. Volvo PTT

Volvo EC330B Excavator Emergency Control User Guide   Emergency Control This function is for emergency operation when malfunction of data bus or V-ECU has occurred. Volvo PTT

Volvo EC330B Excavator F Mode Operation Guide F-mode operation F-mode is used for lifting heavy material or finishing touch. Volvo Truck Diagnostic Software PTT Machine needs slow speed and large lifting force to satisfy these conditions. When control switch is in F mode: -VECU turns off power to travel speed solenoid. That means travel speed is fixed to low speed regardless of travel speed select switch position. Volvo Impact EPC - VECU energize power boost solenoid to increase main relief set pressure by 10%. - VECU turns on power to boom-arm conflux cut-off solenoid. Then boom & arm use only 1 pump flow for slow speed. Volvo prosis https://www.car-auto-repair.com

Volvo EC330B Excavator Engine Speed & Work Mode Control Overview In control system, we can have 10-step engine speed and 5 work-modes. By rotating engine speed control switch, Engine rpm and work-mode is set at the same time. You can see the specification at the next page. Volvo Prosis EPC This function allows the operator to select the engine speed and work mode according to working condition and to optimise the machine performance and fuel efficiency. Principle is simple. Excavator converts the mechanical power from engine to hydraulic power using hydraulic pump. So engine power should be bigger than pump consuming power. If not, engine could be stall or stop.   The V-ECU always receives the current engine speed from the E-ECU . It balances engine horsepower and pump consuming power by changing output current to power-shift valve. Power-shift valve is kind of proportional valve using PWM signal. By controlling power-shift valve, we can change the swash plate angle and finally...

Volvo EC330B Excavator VECU Input and Output Overview VECU Input and Output The vehicle control unit is mounted at right wall of cabin. This controls all of functions related with vehicle according to the input signal. There is various input and output signal. The service people have to know about the function first and input-output signal to diagnose and fix the problem. Volvo Vocom 1

Volvo ECB330B Excavator Electronic control system overview   Volvo ECB330B Electronic control system is composed of various computers and its communication line. In our system, 2 computer (EECU, VECU) is programmable and 1 computer (MDU) is not. Volvo Tech Tool Communication is important thing to control the machine properly. We use two communication lines that is international protocol. The line is twisted to protect the bus from electrical interference.