Festool ATF 55 E Instruction Manual page 10

10
Note: The lower the AWG number, the stronger the cable.
3 Machine construction
Always disconnect the plug from the power
supply before making any adjustments to the circular saw or
installing or removing any accessory!
3.1 Electronics
The ATF 55 E has solid shaft electronics with the following
functions:
Smooth start-up:
The electronically controlled smooth start-up facility enables
start-up of the machine without jerks and requires a lower
start-up current.
No-load speed limitation:
The electronics limit the idling speed in relation to the operating
speed to max. 4800 rpm. By this means the saw is rendered
very quiet during idling, ensuring that the gears and the motor
are treated with care.
Speed regulation:
The speed controller (1.9/2.3) provides infinitely variable
setting between 2000 and 4800 rpm of the speed of the saw
bladen. This enables you to optimise the cutting speed to suit
the material.
Constant speed:
The pre-selected speed remains constant whether the machine
is in operation or in neutral position.
Diode display:
- The green diode (2.2) shows the operator that the machine
is in operation.
- The red diode (2.1) shows that the motor is overloaded by
about 70 %. If the motor is thus overloaded for a lengthy
period, it is switched off by the safety electronics.
Our recommendation: If the red diode lights up, lower the
feed power until the red diode goes off again. You are then
working within the allowed load.
Overload protection:
Current limiting prevents permissibly high current con-
sumption under extreme overload. This can lead to a decrease
in the motor speed. The motor immediately restarts after the
load is removed.
Temperature protection:
To prevent overheating, the safety electronics switches the
machine off when it reaches a critical motor temperature.
Let the machine cool down for approx. 3-5 minutes before
using it again. The machine requires less time to cool down if
it is running, i.e. in neutral position.