Eibenstock PLD 450 B Originalbetriebsanleitung Seite 25

Drill bit extension
If you have to drill deeper than the usable length of your drill bit is:
First, only drill to the point the usable length of the bit reaches.
Remove the bit and pull the centre core out of the hole without
moving the core drilling unit.
Push the drill bit back into the bore hole.
Screw an adequate extension between drill bit and motor. If the collet of
the drill bit is 1 ¼", please do not forget the copper rings which make the
removal of the drill bit easier.
Overload Protection
In order to protect the operator, motor and drill bit, the PLD 450 B is
equipped with a mechanical and electronic overload protection.
Mechanical: If the drill bit is suddenly blocked in the hole, a clutch will
slip disengaging the drill spindle from the motor.
Electronic: To warn the user against overstressing the tool by applying
to high feed force, a LED is mounted on the motor cap. It
does not light during no-load run or at normal load. In case
of over- load, the LED lights red. Now the tool must be
discharged. In case of longer non-observation of the red
indication, the electronics will independently cut the unit off.
After discharge and switching the tool off and on again, you
can continue working.
Safety Clutch
The safety clutch should absorb shock and excessive stress. It is an aid
and not an absolute protection. Therefore you have to handle and drill
carefully. To keep it in good condition, the clutch should slip for a very
short time (max. 2 seconds) in each case only. After excessive wearing
the clutch has to be renewed by an authorized service shop.
Fracture of Segments
If a diamond segment, parts of the reinforcement or something similar
breaks out, and consequently the drill bit seizes, stop working on this bore
and drill a hole with the same centre and a diameter being 15 – 20 mm
bigger.
Do not try to finish your work using another drill bit of the same
diameter!
25