Overload Protection
In order to protect the operator, the motor and the drill bit, the DBM 230 is
equipped with mechanical, electronic and thermal overload protection.
Mechanical:
If the drill bit is suddenly blocked in the borehole, a slip
clutch will disengage the drill bit from the motor.
Electronic:
An LED is built into the housing in order to alert the operator
in case of excessive forward pressure. During no-load or
normal operations, there will be no indication. In case of
overload, the LED will give a red signal. In this case the tool
must be disengaged. If the red signal is disregarded for a
longer period of time, the tool will be switched of
automatically by the electronic device. After disengagement
and switching the tool switch to off and on again drilling may
continue.
Thermal:
The motor is protected from destruction by a thermal
element in case of continuous overload. In this case, the
engine will stop automatically. It may be put back into
operations after a cooling period of approx. 2 min,
depending on the degree of overheating of the motor
winding and ambient temperature.
Safety clutch
The slip clutch is designed to absorb shocks and excessive loads. It is
designed as an auxiliary means and not an absolute protection. Therefore,
care must be taken during drilling. To maintain the operability, the clutch
should slip for max. 2 seconds. After excessive wear the clutch must be
exchanged by an authorized service point.
Do not loosen a jammed drill bit by switching the tool off and on. This
will cause a premature wear of the clutch.
Breaking of a segment
In case that a diamond segment, parts of the reinforcement or similar loosens
during drilling and the drill bit thereby gets jammed, stop working on this
borehole and drill a hole with the same center and a 15 to 20 mm greater
diameter.
Do not try to finish drilling with another drill bit of the same diameter!
