OPERATING INSTRUCTIONS RH 90 C E Operation Demand control / Zero-flow regulation In the fine-control range, swivelling of the hydraulic pumps, and thus the variation of oil flow, are proportional to control lever and pedal valve travel. This means that during the work, the pumps supply only as much hydraulic oil as required to perform the working movement. In the neutral position of the control levers, the pumps are automatically swivelled to zeroflow. These special features offer the following advantages:
minimum power losses
reduced temperature of the hydraulic oil
greater service life of hydraulic pumps and electric motor.
Board-Control-System (BCS) The BCS is a data-evaluating and data-processing system whose function is to collect, evaluate and store data about the excavator's operating status and to display these to the operator. The BCS is based on a micro-processor. The measured values (actual values) supplied by sensors and transducers installed in the excavator are compared to preset nominal values. Out-of-limit conditions are displayed in the form of error messages in the cab. Critical operating conditions are additionally indicated by optical and acoustic warning signals. Further dedails are set out in the Board-ControlSystem operating instructions.
Electrical system
BA RH90C(3 720 760.00)-EN
Supply (medium voltage)
voltage
6300 V
Control (low voltage)
voltage
400/230 V
Lighting voltage
24 V
Emergency voltage
24 V
Control voltage
24 V
2-9
