Priority flow control - PFC

Automatic activation for a smooth operation

The Priority flow control system (PFC) is an electronic control function, which automatically couples in when the crane operator's activation of the control valve levers requires a higher flow than the pump is able to provide. All functions run, just more slowly, except for slewing, which is kept constant.

Avoid sudden and unintended variations of speed

The PFC function calculates how much oil flow the user requires based on the total activation of the levers.

- As long as the total activation of the levers requires less oil than the max. permissible oil flow of the pump, the PFC does nothing.

- When the activation of the levers requires more oil flow than the pump is able to supply, the PFC function becomes active and influences the valve positions of the control valve for optimum flow distribution.

When the PFC function couples in, the changes take place in a controlled and unnoticeable way. It gives a more smooth operation of the crane without fast and sudden variations of speed.

Maximum utilization of the pump performance

The pump performance can constantly be utilized to its max. limit so that crane operation is carried out without unnecessary waste of time. The operating economy is improved by reducing the energy consumption and thereby the fuel consumption.
The job satisfaction of the user is improved when the crane movements are optimized during work at high speed.

Slewing function always supplied

The slewing function has been given so high priority so that the PFC function does not reduce the oil flow for this function. The PFC function is implemented as standard on all RCS cranes.