5-66 LeeBoy 8520C Conveyor Paver
Maintenance
Plus One Controller
The Plus One 50-pin controller monitors paver control
systems and alerts the operator in the event of a fault.
The Plus One status light on the control panel (Figure
5-74) illuminates green and blinks continuously or
blinks, then pauses, then blinks again, depending upon
the fault or mode. Some fault codes will also display on
the PV480 digital controller. (See code tables on the
following page.)
Figure 5-74. Plus One Light
• The light will stay on and the Plus One will not allow the
engine to start if any joystick is out of neutral or more
than one Run/Stop switch is in the RUN position.
• If the joystick(s) is in the forward position and the Run/
Stop switch is in the RUN position, the Plus One will
disable the control box after a set period of time. This
is a safety measure in the event the operator leaves
the station with the control box still active and the
joysticks accidentally moved. The operator must
then toggle the Run/Stop switch from RUN to STOP
and back to RUN again to regain control.
These faults will also prevent machine movement:
• Steering control box not detected.
• Joysticks not optimized.
• Pump control coil fault.
• Brake valve/pump neutral bypass coil fault.
• There is only one steering control box present.
• The fault happens in the steering control box that has
control (Run/Stop switch in the RUN position).
• The fault occurs when neither steering control box is
in control.
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