The Core Drilling Operation - Hilti DD 350-CA Manual De Instrucciones

6 The core drilling operation

CAUTION
The AC supply voltage must correspond to the voltage
rating given on the type identification plate.
en
DANGER
Have the earth / ground conductor installation in the
mains supply and the earth / ground connection in the
machine checked at regular intervals.
WARNING
Take care to ensure that the supply cord does not come
into contact with rotating parts.
WARNING
Make sure that the supply cord is not pinched and dam-
aged as the carriage advances.
CAUTION
The machine and the drilling operation generate noise.
Wear ear protectors.
Excessive noise may damage the hearing.
CAUTION
Drilling may cause hazardous flying fragments.
Flying fragments present a risk of injury to the eyes and
body.
Wear eye protection and a hard hat.
DANGER
When drilling through walls, secure (cordon off) the area
behind the wall, as material or the core may fall out on
the other side of the wall. When drilling through ceilings,
secure (cordon off) the area below as drilled material or
the core may drop out and fall down.
CAUTION
Take care to avoid touching rotating parts when regulat-
ing the water flow while the machine is running.
CAUTION
An isolating transformer must be used with 110 volt
machines.
12
6.1 Keep everything clear of the danger zone
The shaded area in the illustration indicates the danger
zone around the core drilling machine. Stay clear of the
core bit when the machine is in operation (keep a distance
of at least 15 cm (6")).
6.2 Switching on and checking the ground fault
circuit interrupter (PRCD)
DANGER
If the test LED on the PRCD doesn't go out, further
operation of the core drilling machine is not permissi-
ble. Have the core drilling machine repaired by a qualified
specialist using genuine Hilti spare parts.
1. Plug the core drilling machine's supply cord into an
earthed/grounded power outlet.
2. Press the "On" button on the PRCD (ground fault
circuit interrupter).
The test LED on the PRCD must light.
3. Press the "Test" button on the PRCD ground fault
circuit interrupter.
The test LED on the PRCD must go out.