Dd 250: The Diamond Core Drilling Machine Is In Working Order - Hilti DD 250 Manual De Usuario

8.4 DD 250: The diamond core drilling machine is in working order

Malfunction
Overheating.
Remaining running time un-
til the carbon brushes are
changed.
Running in after carbon
brushes are changed.
The multifunction display is
not showing anything.
Unable to activate
hole-starting mode.
Possible cause
The motor has overheated. The
diamond core drilling machine is
running in cooling mode.
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.
Communication error between the
motor electronics and multifunction
display.
Diamond core drilling machine is
drilling.
The carbon brushes have been
replaced and the diamond core
drilling machine is engaged in the
running-in process.
The motor has overheated. The
diamond core drilling machine is
running in cooling mode.
The diamond core drilling machine
has just been operated for two
minutes in hole-starting mode.
Action to be taken
▶ 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. When normal
temperature is reached the
indication in the display goes
out and the diamond core
drilling machine activates the
restart interlock. Switch the
diamond core drilling machine
off and then on again.
▶ 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.
▶ The diamond core drilling
machine is capable of working
even without indicator display.
▶ Bring the diamond core drilling
machine to Hilti at your earliest
convenience.
▶ Turn the handwheel until the
core bit is no longer in contact
with the base material.
▶ Complete the running-in pro-
cess.
▶ Complete the cooling process.
▶ Wait at least 30 seconds before
reactivating hole-starting mode.
27