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Overload Protection
To protect the user, motor and drill bit, the EHD 1500 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 as a
overload indicator. 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. Here also, the user is warned by
the overload indicator. Shortly before the maximum
temperature is reached, the indicator flashes red.
In that case, the tool switches off and can only be restarted
after a certain cooling-down period (approx. 2 minutes). The
overload indicator flashes until the machine has cooled
sufficiently and can be used again. 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.
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
centre.
Care and Maintenance
Before the beginning of the maintenance- or repair works
you have to disconnect plug from the mains.
It is a must to unplug the tool before starting any service or repair works.
Repairs may be executed only by appropriately qualified and experienced
personnel.
After every repair, the unit has to be checked by an electrical specialist.
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