Operation; Control Circuit Components - nifty Heightrider HR21 Operating/Safety Instructions Manual

HR Series
Operating & Safety Instructions
4

Operation

4.1

CONTROL CIRCUIT COMPONENTS

4.1.1
MAIN CONTROL BOARD: - Situated under the left-hand superstructure cover, the encapsulated control
board comprises a PCB (printed circuit board) design which incorporates all of the relays to control the
machine operation. The control boards are common to all models, and contain functions which might
not be utilised on your particular machine.
4.1.2
TILT ALARM: - Fitted to the superstructure underneath the base controls cover, a solid state sensor
which monitors the inclination of the machine. It directly controls the BRV (Brake Release Valve) and
the Drive Flow Control valve. Also, if the platform is in use, i.e. Booms are raised, once the inclination
exceeds the pre-set limit, it will disable the drive to the machine and sound the alarm. In order to
recover the machine, the platform operation is unaffected, allowing the operator to restore drive when
the machine is stowed. It is then possible to drive back onto level ground, fully restoring machine
operation.
4.1.3
MULTI-TONE SOUNDER: - Situated on the side of the base control box is a small piezo electric
sounder, which is used to provide an intermittent alarm whenever the machine is in operation. Pushing
the green "power control" button or depressing the foot switch in the cage (if fitted) will energise this
sounder. This serves to warn personnel of the operation of the machine.
This device also sounds to indicate a number of other machine conditions as follows;
Tilt Alarm: - If this sensor detects excessive inclination with the booms raised, it will sound
continuously in conjunction with the tilt warning light (see Page 26).
Cage Weigh: - If the electronic load cell detects an overload condition it will sound continuously in
conjunction with the cage overload warning light. Note; this also occurs on machine start for
approximately 2 seconds during the load cell configuration sequence.
Battery management: - when a low battery state is reached, the "pulsing" of the D.C. motors is
mimicked by the sounder reinforcing the message to the operator to charge the machine. Note; if the
sounder activates whilst using electric power only, it is advisable to start the engine enabling the
operator continued use of the machine, whilst recharging the batteries.
Fuel level: - the sounder will activate when the low fuel warning light illuminates.
4.1.4
HORN: - Also located on the back of the base control box is a horn. It can be used as a manual alert,
by pushing the "Horn" button at the Platform control position.
4.1.5
DRIVE CONTROL VALVE (DCV): - The DCV is comprised of several individual components all directly
involved in the hydraulic supply to the wheel drive motors. Principally, the drive control valves change
the hydraulic motor displacement from High to Low and also controls switching between 2WD and
4WD (where applicable). This control function allows the operator to select both High Gradeability/Off
Road Drive from High displacement, or High Drive (Hare) and Low Drive (Tortoise) from Low
displacement.
4.1.6
SUSPENSION CONTROL VALVE: - This valve controls the cylinders on the unique suspension system.
This system will only be active when the booms are in the down position and the telescope is retracted.
22
English/USA – 11/09
Original Instructions