Snorkel A38E-sn006001+ - Manual (Page 21)

Operation
Section
3-1 A38E Work Platform
3.0
3.0 Introduction
GENERAL FUNCTIONING
The Drive function is operated by utilising two drive
motors which are controlled by a Electronic Traction
Motor Controller.
NOTE:
An Interlock Trigger Switch is an integral part of the
Joystick. This must be depressed for the functions to
operate. This will energise the Line Contactor and enable
electrical control. (This safety feature prevents
inadvertent activation of all powered functions, in the
case of accidental movement of the Joystick.)
DRIVING
Platform controls provide variable speeds for the
drive function through the use of a Joystick. This is
achieved using a motor control unit which varies the
speed of the two DC electric traction motors. To drive
the A38E there are a number of steps which need be
taken. First the operator should ensure that neither of
the Emergency Stop Buttons are pressed, then the
Keyswitch on the ground control panel should be
‘PLATFORM CONTROL’ position.
function switch and
The machine will then drive at a speed proportional
to the angle of the Joy-stick from the neutral (centre)
If a boom is raised off the Boom Rest Limit Switch
the current to the drive motors will be reduced leading
to a significantly slower drive speed. This is a safety
feature. The drive wheels are driven by two DC
electric traction motors coupled to two braked
gearboxes. When the Joystick is in the neutral
position the brake chamber is free of oil and the
internal spring within the gearbox maintains the
braking pressure. Upon moving the Joystick the
brake chambers will receive a flow of pressurised
oil which will release the brakes.
STEERING
Platform controls also provide a steering function
through the use of ‘Rocker’ activated Steering
Switches in the Joystick. This is achieved by using the
tl a y b w o lf c il u a r d y h e h t s e ir a v h c i 0 0 6 P wh ering
the voltage to the pump. To steer the A38E there are
a number of steps which need be taken.
First the operator should ensure that neither of the
NOTE:
Steering is not self-centring. The wheels must be
returned to the straight ahead position by operating the
Steering Switch.
OPERATING THE BOOMS
Boom functions, including the telescopic and slewing
functions, can be operated either from the Platform
Controls or the Chassis Controls.
The Platform controls provide variable speeds for the
boom functions through the use of a Joystick. This is
d e e p s e h t s e ir a v h c i h w 0 0 6 P n a g n i s u d e v e i h c a
of the motor/pump unit and increases or decreases
the flow of oil to the different functions. This control
unit receives a control signal from the Joystick on the
upper controls, the speed of the motor will increase
as the Joystick is pushed further away from the
neutral (centre) position.
position, while the
turned to the
Momentarily operate the drive
the A38E will be able to drive.
WARNING
Emergency Stop Buttons are pressed, then the
Keyswitch ground control Panel should be turned to
‘PLATFORM CONTROL’ position. the
Before beginning to operate the machine it is a
mandatory requirement to read, fully understand
and follow the Operators Manual.
Joystick Interlock Switch is
depressed. The speed range within which the machine
will drive is deter-mined by whether or not the booms
are raised.
The A38E Lift and Steer functions are operated by
utilising a battery powered electric motor which
drives a hydraulic pump. The pump supplies oil
under pressure to the various platform functions.
electrically activated solenoid valves (the control
of which solenoid valve activates and the rate at
electrical circuit, and its components).
Momentarily operate the drive function switch to drive
and the A38E will also be able to steer. To steer the
machine the Rocker should be pushed to the left or
the right, while the Joystick Interlock Switch is
depressed. Steering left or right will energise the
steering coils and allow oil to enter the full bore side
or annular side of the steering cylinder, there by
turning the wheels in the chosen direction. The
orientation of the Platform to the Chassis will
determine the direction the machine will travel when
the Joystick is engaged.