Husqvarna DXR300, Operator'S Manual

Page: 15 / 60

English
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MACHINE´S SAFETY EQUIPMENT
General
In this section the machine’s safety features and their function
are explained. Concerning inspection and maintenance, see
the instructions under Maintenance and service.
The machine’s safety features can be divided into safety
features for personal protection and those for mechanical
protection. Some of the safety features provide both
mechanical and personal protection.
Personal protection
Indication of zero position
If either of the joysticks is in an operative position when the
remote control is started, the function will be blocked. The
operator is informed of this by means of an error message
appearing on the screen. To reset the function, the remote
control must be turned off and on again.
The function also protects against faults in the potentiometer
or cable breaks.
Signal voltage limitation
Signal voltage limitation prevents the machine executing
unexpected movements in the event of a cable breaking or a
short-circuit.
The voltage level of the control signals is limited to within a
maximum and minimum value. If the voltage level falls outside
the permitted interval, the machine stops.
Joystick guard
The safety feature reduces the risk of unintentionally moving
the machine by locking the control circuit if the joysticks have
been in neutral for three seconds.
The control circuit is activated by means of the left button on
the right joystick. It is activated when the button is released.
This guards against fixing the button in an active position.
Radio block
If the remote control has lost connection for two minutes the
electronic unit in the machine is blocked to radio signals. A
message appears on the display. Confirm the message to
return to normal operation.
The safety feature ensures that the operator knows which
machine will start and that the correct remote control is being
used for the machine. This is particularly important when
there are several machines at the same workplace.
Identity code
The remote control and the machine are connected by means
of a pre-programmed ID code. The ID code ensures that the
right remote control is used for the right machine.
If several machines are used at the same workplace there is
a risk of mixing up the remote controls.
Switch on the current to the remote control and the machine.
Press the horn to see which machine is connected to the
remote control. The machine will beep and flash three times.
Do not activate the remote control before you have ensured
that the correct machine is being operated.
When steering the machine using cables, the ID code is
suppressed and the same remote control can be used for
different machines if these have the same control system
version.
Automatic frequency hopping
In the event of interference in the communication, the
frequency changes automatically to guarantee interference-
free transmission.
Emergency stop/machine stop
The machine stop on the remote control and the emergency
stop on the machine break the power to the electric motor.
Protective earth
The machine and its components are connected to grounding
conductors in the power cable. If there is a fault, a fuse is
tripped and the current is disconnected.
The machine must be connected to a power point with a
protective earth. If there are no grounding conductors, or if
they are connected incorrectly, have come off or are loose in
a terminal, the current will remain connected and touching the
machine can be highly dangerous.
If there is reason to believe that the protective earth has been
damaged, the machine must be turned off and the power
cable removed until such time as the protective earth has
been restored.
Always connect the machine through an ground fault circuit
interrupter with personal protection, i.e. an ground fault circuit
interrupter that trips at an ground fault of 30 mA.
Hydraulic brake
Hydraulic motors are used when moving the machine. All
hydraulic motors are fitted with brakes. These hydraulic
motors contain counter balance valves that prevent
uncontrolled flow through the motor, e.g. when manoeuvring
down a slope or when the machine is parked. The counter
balance valve closes the tank opening when the drive motors
are not being operated.
Mechanical brake
The machine’s drive motors are equipped with a mechanical
parking brake. The machine is braked until its drive function is
activated.
Locking of the main switch
The main switch on the machine can be locked with a padlock
to prevent unauthorised persons from starting the machine.
!
WARNING! Do not modify the machine’s
safety devices and check regularly that they
are working properly. The machine must not
be driven if protective plates, protective
covers, safety switches or other protective
devices are not fitted or are defective.