Overload Protection - Hilti DD100 Bedienungsanleitung

Overload protection

The DD100 is equipped with mechanical, elec-
tronic and thermal overload protection devices.
Mechanical
This protects the operator, motor and core bit
if the core bit suddenly sticks (safety clutch)
Electronic
If the machine is overloaded due to excessive
pressure being applied, the current is reduced
so that the core bit only rotates slowly.After re-
leasing pressure on the core bit, full current
is again supplied to the motor and the drilling
speed returns to normal.
Thermal
The motor is protected additionally against con-
tinuous overloading by a temperature sensor
which automatically reduces current input.The
DD 100 can be made to operate at normal speed
by pressing the switch after the temperature
of the motor windings has dropped sufficiently.
Cooling of the motor windings can be assist-
ed by allowing the machine to run without load.
The motor speed necessary for effective cool-
ing can be reached more quickly by depress-
ing the switch several times.
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Printed: 07.07.2013 | Doc-Nr: PUB / 5069509 / 000 / 00
Overload indicator
If the overload indicator (➀) lights up, it is an
indication that you are approaching the limit of
thermal overload. It is recommended that the
DD100 is operated in such a way that the
overload indicator lamp does not light up(if the
indicator remains on, the thermal motor pro-
tection will be activated).After the machine has
been allowed to cool, work can continue nor-
mally (cooling at no-load speed approx. 20 sec-
onds).
Dry/wet vacuum removal
TDA-VC60
➀
Caution: In order to avoid overheating and
damage to the core bit, drilling dust must be
removed continuously, allowing ventilation of
the cutting edge.
If suction is poor (low drilling progress), clean
the contaminated filter (operate shaker after
drilling each hole). Clean the extraction head
and core bit. It may be necessary to use a vac-
uum cleaner with greater suction capacity.
Empty the dust container regularly.
Note:
The TDA-VC60 must be used when a large
number of consecutive holes are being
drilled! The TDA-VC40 is suitable only for
occasional use.
When drilling overhead,wet vacuum removal
is absolutely essential.A dust removal system
must be used for dry drilling.
Wet vacuum removal: See page 27 for adap-
tor.