Operation - Hilti TEMD20 Operating Instructions Manual

-WARNING-
If the indicator lamp continues to light, further use of the
tool is not permissible. Have the tool repaired by a qual-
ified specialist using genuine spare parts.
4. Press the "RESET" button on the PRCD ground fault
interrupter (the indicator must then light).
The tool is then ready for operation.
6.6 Use of extension cords
Use only extension cords and adapter cords of adequate
cross section which have been approved for use in the
application concerned. The cord may otherwise overheat
or a drop in performance may occur.
The recommended conductor cross-section is 2.5 mm
over a length of max. 60 m.
Check that the extension cord and plug are adequately
protected by a suitably-rated fuse in the electric supply.
To avoid overheating, always unroll the full length of the
extension cord from the drum even when only a short
length is required.
Connect the tool to the electric supply only once it has
been set up ready for use.
-NOTE-
When the tool is operated in areas where there is a risk
of explosion, only approved extension cords or supply
cords may be used, the plugs or connectors (TE-MPH)
of which must be approved for use in damp areas and
designed to ensure safe connection and disconnection
in areas where there is a risk of explosion (please also
refer to section 6.5).
-NOTE-
When the tool is operated in areas where there is no risk
of explosion, extension cords which are at least approved
for use in damp areas / outdoors must be used. The plug
on the tool's supply cord and the connector on the exten-
sion cord must be fully compatible and ensure the spec-
ified degree of protection against ingress of water or oth-
er foreign matter.
6.7 Use of a generator or transformer
When the tool is powered by a generator or transformer,
the following conditions must be fulfilled:
AC voltage, output power at least 7000 VA.
G
The operating voltage must be within +5% and –10%
G
of the rated voltage at all times.
Frequency range 50–60 Hz.
G
Automatic voltage regulation with starting boost.
G
The unit must be correctly earthed.
G
A ground fault circuit breaker as described at section
G
6.5 must be used. Equivalent or superior protective
systems may be used (e.g. ground leakage sensor for
the AC/DC circuit).
Never operate other machines or appliances from the
generator or transformer at the same time. Switching
other machines or appliances on and off may cause
undervoltage and / or overvoltage peaks, resulting in
damage to the tool.
Printed: 08.07.2013 | Doc-Nr: PUB / 5071280 / 000 / 01

7. Operation

It is essential that the safety precautions printed in these
operating instructions are read and observed.
I The tool and the drilling operation emit
noise.
I Excessive noise may damage the hear-
ing.
I Wear ear protection.
2
I Drilling may cause hazardous splinter-
ing of the material.
I Splintering material may injure parts of
the body and the eyes.
I Wear eye protection and a safety hel-
met.
-CAUTION-
Make sure the device is firmly positioned before oper-
ating for the first time. Make sure that you can safely
operate the ON/OFF switch at all times with your hand
on the hand grip.
7.1 Drilling
-NOTE-
The following information printed on the grey background
has to be generally respected for all tools and in all envi-
ronsments.
1. Open the water valve on the water leg. Make sure that
water flows continuously while drilling.
2. Bring the tool with the water leg into the drilling position.
3. Switch on at the ON / OFF switch.
4. Regulate the contact pressure at the water leg so that
the drill bit runs centrally in the hole being drilled. The
tool should hammer evenly without kicking back.
5. Move the water leg as necessary, as the drilling oper-
ation continues.
-NOTE-
In the event of the drill bit head jamming in the hole
G
while drilling, proceed as follows:
Leave the power tool switched on and hold it secure-
G
ly as the forces that occur may be higher than during
normal operation (this is due to activation of the slip
clutch - the mechanical device that disconnects the
motor from the gearing).
Free the jammed drill bit by altering the drilling advance
G
pressure through adjustment of the control valve on
the water leg.
If this fails to free the jammed drill bit, switch off the
G
power tool, separate the power tool from the drill steel
and then use a suitable tool to extract the drill bit from
the hole.
-CAUTION-
-CAUTION-
19