Hilti DD 150-U, Manual

Page: 51 / 534

*434949*
434949 English 43
8.1 The diamond core drilling machine is not in working order.
Malfunction Possible cause Action to be taken
The service indicator shows
nothing.
The PRCD isn’t switched on. ▶ Check that the PRCD is
functioning and switch it on.
Interruption in the electric supply.
▶
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.
Water in the motor. ▶ Allow the diamond core drilling
machine to dry out completely
in a warm, dry place.
The service indicator lights.
The carbon brushes are worn out. ▶ Replace the carbon brushes.
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The service indicator blinks.
The motor has overheated. ▶ 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.
Overload error.
▶
Switch the diamond core drilling
machine off and then on again.
▶ Guide the diamond core drilling
machine straight and/or apply
less drilling pressure.
The theft protection indicator
blinks.
The diamond core drilling machine
has not been unlocked (machines
with optional theft protection sys-
tem). ▶ Use the TPS key to unlock the
diamond core drilling machine.
8.2 The diamond core drilling machine is in working order
Malfunction Possible cause Action to be taken
The service indicator lights.
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. ▶ Have the carbon brushes
replaced at the next opportunity.
The carbon brushes have been
changed and must be run in.
▶
Run in the carbon brushes by
letting the machine run under
no load for at least 1 minute
without interruption.
The diamond core drilling
machine doesn’t achieve full
performance. Supply network fault – undervolt-
age occurred.
▶
Check whether other power
consumers are disrupting the
power supply from the network
or generator.
▶ Check the length of the exten-
sion cord used.
The diamond core bit doesn’t
rotate. The gear selector isn’t engaged. ▶ Operate the gear selector until
it engages.
Printed: 09.08.2019 | Doc-Nr: PUB / 5069546 / 000 / 09