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Overload Protection
To protect the user, motor and drill bit, the ETN 130/3 P is equipped with a
mechanical, electrical and thermal overload protection.
Mechanical:
In case of sudden jamming of the drill bit, the drilling
spindle is unclutched from the motor by means of a slip
clutch.
Electrical:
To warn the user against overstressing the tool by applying
to high an advance force, the handle includes a LED. It
does not light during idle run or at normal load. At overload,
it lights red. In that case the tool most be stress-relieved. In
case of longer non-observation of the rad indication, the
electronics will independently switch the tool off. After
relieving be switching the tool off and on, the work can be
continued as normal.
Thermal:
In case of permanent overload, a thermocouple protects
the motor against destruction. In that case, the tool
switches off and can only be restarted after a certain
cooling-down period (approx. 2 minutes). The cooling-down
time depends on the temperature of the motor winding and
ambient temperature.
Safety Clutch
The slip clutch served for compensation of shocks and overload. It is an aid
and not an absolute protection. Therefore you have to handle and drill
carefully. To keep its functionability, it should not slip for more than 2
seconds. In case of excessive wearing, it can be replaced by an authorized
service shop.
Care and Maintenance
Before the beginning of the maintenance- or repair works
you have to disconnect plug from the mains.
Repairs may be executed only by appropriately qualified and experienced
personnel. After every repair, the unit has to be checked by an electrical
specialist. According to its design, the tool requires a minimum of care and
maintenance. However, the following maintenance works and component
checks have to be performed in regular intervals:
Clean the tool after completion of your work. Apply some grease
onto the drilling spindle thread. The ventilation slots must always
be clean and unclogged. Make sure that now water gets into the
tool during cleaning.
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