PowerBoss Nautilus Hi-Dump PB45HDSL, Service Booklet

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Setting the scrub brush floor pressure controller (proportional valve driver)
The floor brush pressure controller or proportional valve driver (located on the left front face of the
operator console) provides three separate brush floor pressure forces by controlling the hydraulic
pressure output of the proportional reduction valve located on the main hydraulic manifold at port 6.1.
This variable output pressure is applied to the rod-end of the scrub head lift cylinder. This variable
pressure is balanced against a steady 450 psi at the piston-end of the cylinder (provided by the
reduction valve) to achieve the desired scrub brush floor pressure.
The controller has a left control knob, a right control knob, and an information screen.
The right control knob scrolls through the various parameters.
The left control knob provides input settings.
Description of the adjustable parameters:
P1 – The low brush floor pressure setting.
P2 – The medium brush floor pressure setting
P3 – The high brush floor pressure setting
P4 – The P4 setting is not used. (Any numerical input will have no effect.)
J9 – Jog. This is used to simulate a P1 – P3 setting and its effect on the brush pressure in real time.
UP - The ramp time required for the output signal to increase by 1 amp.
dn - The ramp time required for the output signal to decrease by 1 amp.
dF – Dither frequency. (Dither is an oscillation feature that eliminates slip stick in the operation of the
solenoid.)
di – Display orientation
SA – Save settings