nifty Heightrider HR28 Series Operating/Safety Instructions Manual page 23

SLEW SWITCH: - Mounted under the superstructure, this switch limits the drive speed to a preset low
speed when the machine has been rotated from its stowed position.
4.1.2 PLATFORM
PLATFORM PROGRAMMEABLE LOGIC CONTROLLER (PLC): - Situated in the platform is the
Platform Control Station. Behind the platform control panel is the Platform PLC. The purpose of the
Platform PLC is to interpret signals received from the Platform Control Station and convert them to a
digital signal, which is then output to the Master PLC for processing.
CAGE DISPLAY UNIT: - Mounted in the Platform Control Station, this gauge receives signals from the
Master PLC to provide a warning indication to the operator for a range of functions. Refer to
Section 4.3.2 for further details.
LOAD SENSING CONSOLE (SiOPS
senses if the operator has been pushed or has fallen against the console. If the load applied to the front
of the console is greater than the pre-determined amount, the footswitch will be disabled to increase
operator safety and reduce the possibility of sustained involuntary operation of the cage controls. For
further information refer to Section 4.3.5.
4.1.3 CHASSIS
DIGITAL MODULE: - Situated inside the chassis, this unit is a local extension to the Master PLC and is
used to control all hydraulic valves below the slew rotation gear.
MOTION CONTROL VALVE: - This valve comprises several individual components all directly involved
in the hydraulic supply to the wheel drive motors. Included in these are the drive control valves which
allow the operator to propel the machine forward or backward by using the Joystick (See Section
4.3.1).
In addition the Brake Release Valve (BRV) is also incorporated into this valve block. It is a solenoid
operated valve, which controls the brake function on the machine. This valve must be energised to
allow the machine to move. If no voltage is present, the wheel motors will not be able to develop drive
torque, whilst at the same time, the parking brakes will remain engaged. The BRV will only operate
when a green "Power Control" push-button is being used (or the Platform Foot-switch is depressed) in
Drive mode. If the tilt sensor detects an excessive inclination whilst the booms are raised it is the BRV
which is de-energised to isolate the machine.
4.1.4 POWER TRAY
AC MOTOR CONTROLLER: - Situated on the power tray, this unit converts DC power into AC to
control the electric motor.
DIGITAL MODULE: - Situated on the power tray, this unit is a local extension to the Master PLC and is
used to activate engine functions, and monitor readings such as water temperature and low oil
pressure.
DIESEL ENGINE/ELECTRIC MOTOR: - A diesel engine assisted by an electric motor (when required)
driving a load sensing swash pump This arrangement allows proportional speed control of all
appropriate functions.
English/USA – 04/15
Original instructions
Operating & Safety Instructions
TM
): - This machine incorporates a load sensing console that
Height Rider/SP Series
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