Hilti DD 150-U Manual De Instrucciones Original página 51

8.1 The diamond core drilling machine is not in working order.
Malfunction
The service indicator shows
nothing.
The service indicator lights.
The service indicator blinks.
The theft protection indicator
blinks.
8.2 The diamond core drilling machine is in working order
Malfunction
The service indicator lights.
The diamond core drilling
machine doesn't achieve full
performance.
The diamond core bit doesn't
rotate.
*434949*
Printed: 05.02.2019 | Doc-Nr: PUB / 5069546 / 000 / 06
Possible cause
The PRCD isn't switched on.
Interruption in the electric supply.
Water in the motor.
The carbon brushes are worn out.
The motor has overheated.
Overload error.
The diamond core drilling machine
has not been unlocked (machines
with optional theft protection sys-
tem).
Possible cause
The carbon brush wear limit has
almost been reached. The diamond
core drilling machine will continue
to run for a few hours until it shuts
down automatically.
The carbon brushes have been
changed and must be run in.
Supply network fault – undervolt-
age occurred.
The gear selector isn't engaged.
434949
Action to be taken
▶ Check that the PRCD is
functioning and switch it on.
▶ Plug in another electric tool or
appliance and check whether it
works.
▶ Check the plug connections,
supply cord, power supply line
and main supply fuse.
▶ Allow the diamond core drilling
machine to dry out completely
in a warm, dry place.
▶ Replace the carbon brushes.
→ page 42
▶ Wait a few minutes until the
motor has cooled down or
allow the diamond core drilling
machine to run under no load in
order to speed up the cooling
process. Switch the diamond
core drilling machine off and
then on again.
▶ Switch the diamond core drilling
machine off and then on again.
▶ Guide the diamond core drilling
machine straight and/or apply
less drilling pressure.
▶ Use the TPS key to unlock the
diamond core drilling machine.
Action to be taken
▶ Have the carbon brushes
replaced at the next opportunity.
▶ Run in the carbon brushes by
letting the machine run under
no load for at least 1 minute
without interruption.
▶ Check whether other power
consumers are disrupting the
power supply from the network
or generator.
▶ Check the length of the exten-
sion cord used.
▶ Operate the gear selector until
it engages.
English 43