Hilti TEMD20 LS T, Operating Instructions Manual

Page: 26 / 49

22
-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 and connecting cables
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
2
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.
●
The operating voltage must be 5% and –10%
of the rated voltage at all times.
●
Frequency range 50–60 Hz.
●
Automatic voltage regulation with starting boost.
●
The unit must be correctly earthed.
●
A ground fault circuit breaker as described at section
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.
ply that complies with the information given on the type
plate.
The tool must be connected to an adequately dimen-
sioned earth conductor by way of the mains plug. The
earth connection must be checked at regular intervals to
ensure correct functionality.
The electric supply must be equipped with a pulse-con-
trolled / DC-sensitive ground fault circuit breaker (type
A or B as per IEC 61008) with a sensitivity of max. 10
mA. This device must be checked at regular intervals in
accordance with the manufacturer’s instructions.
Equivalent or superior protective systems may be used
(e.g. ground leakage sensor for the AC/DC circuit).
6.5.2 Connecting the TE MD20 LS T /
TE MD20 LS T HA / TE MD20 LS T EM /
TE MD20 LS T IM to the electric supply
If operated in atmospheres where there is a risk of
explosion
Only approved plug/socket systems (EEx d I/IIA, IP66)
in accordance with 94/9/EC may be used, e.g. Hilti
TE-MPH with intrinsically safe pilot contact, monitored
earth/ground, 220–240 V phase, neutral conductor. Dis-
connection from the power supply must be by way of
an isolating switch.
-CAUTION-
Check to ensure that the tool is switched off before con-
necting it to the electric supply.
-NOTE-
The plug

is equipped with a pilot contact which allows
use of an external ground connection monitoring system
(pilot contact switching). In addition, in the TE MD20 LS
T, TE MD20 LS T EM and TE MD20 LS T HA, a diode is
fitted between the pilot contact and the ground lead. A
line terminator is incorporated in the TE MD20 LS T IM.
The monitoring circuit must be self-testing (intrinsical-
ly safe) in accordance with EN/IEC 60079-11.
6.5.3 Connecting the TE MD20 LS T PRCD /
TE MD20 LS T HA PRCD / TE MD20 LS T EM
PRCD to the electric supply
Ground fault circuit interrupters of the PRCD  type are
incorporated in the supply cords of the TE MD20 LS T
PRCD / TE MD20 LS T HA PRCD / TEMD20 LS T EM
PRCD. When making one of these tools ready for use,
proceed as follows:
-CAUTION-
Check to ensure that the tool is switched off before con-
necting it to the electric supply.
1. Plug the tool's supply cord into the electric supply
socket.
2. Press the "RESET" button on the PRCD ground fault
circuit interrupter (the indicator lamp must then light).
3. Press the "TEST" button on the PRCD ground fault
circuit interrupter (the indicator lamp must then go
out).
Printed: 08.07.2013 | Doc-Nr: PUB / 5071845 / 000 / 01