Husqvarna DXR300 Operator's Manual page 16

MACHINE´S SAFETY EQUIPMENT
Mechanical protection
Automatic phase rotation relay
The automatic phase rotation relay prevents the electric
motor starting with the wrong rotation direction thus causing
mechanical damage.
Motor protection
To prevent overloading, the motor is equipped with bimetallic
relays in the motor linings that disconnect the power to the
motor if it gets too hot.
If the motor is too hot it is not possible to operate the tools.
The rest of the machine's functions can be run at half speed
in order to facilitate evacuation of the machine from risky
environments.
Once the motor's temperature has fallen to a normal working
temperature all functions can be used again.
The machine's softstarter is fitted with a motor cut-out that
trips if the current is too high for too long a period. The
machine's functions return to normal position after
approximately three minutes.
Fuses
Fuses are used to protect the following components as well
as to prevent fire in conjunction with faults or if electrical
components are overloaded.
Pressure relief valves
The machine's hydraulic system is equipped with pressure
relief valves. They protect the hydraulic system against too
high pressure and the mechanical components against
overloading.
Circulation valve
The circulation valve drains the hydraulic flow into a tank and
relieves the pressure on the hydraulic system. No pressure
enters the cylinders and it prevents the risk of unforeseen
movements. This happens, for example, after three seconds
of inactivity.
16 –
English