Hilti TEMD20 Operating Instructions Manual page 22

6.2 Fitting the drill steel
Use TE-MDR drill steels or drill steels according Hilti
specification with appropriate fit to the tool only.
(Comment: Hilti rods differ in length and shape of the
connecting part to standard rods)
1. Clean away any dirt adhering to the connection end
and apply a little grease to it.
2. Screw the drill steel fully into the connection end.
3. Guide the connection end into the chuck and rotate it
until the grooves and splines are in alignment and then
push it in as far as it will go.
4. Close the chuck locking mechanism and check that
the connection end is held securely.
6.3 Fitting the water leg
Use only the TE-MW or TE MW-T water leg (with TE-MW
2G or TE-MW 4G support base fitted) as only then is the
water supply to the tool ensured.
1. Clean off any dirt adhering to the connecting pin on
the water leg.
2. Position the guide on the underside of the front hous-
ing of the tool on the water leg and insert the con-
necting pin in the hole provided.
3. Secure the connection by inserting the retaining pin
in the hole in the connecting pin.
4. The securing plate on the connecting pin must be
released before separating the tool from the water leg
(e.g. for transport). The water leg can then be pulled
away from the tool.
6.4 Water connection
-NOTE-
The following information printed on the grey background
has to be generally respected for all tools and in all envi-
ronsments.
The tool and drill bit are water-cooled and the water has
a flushing function during drilling.
– Water pressure: min. 3 bar, max. 5 bar
– Water temperature: approx. 10–20°C
– Cooling water flow rate: approx. 10 l/min
– Permissible degree of water pollution: <40 µm.p
-NOTE-
The TE-MW and TE-MWT water legs are fitted with a
pressure-reducing valve in order to ensure that the max-
imum permissible water pressure of 5 bar is not exceed-
ed. The maximum permissible water pressure in the water
hose to the pressure-reducing valve in the water leg must
not exceed a pressure of p
The cooling water is supplied to the tool through a stud
on the water leg saddle which is connected to the water
supply.
If the Hilti TE-MW or TE-MW T water leg are used, con-
nection to them is by way of a 1" tapered sleeve.
Check the flow of water. Water must spray out of the
bores in the drill bit.
6.5 Electrical connection
6.5.1 General points
The tool must be powered by an alternating current sup-
18
Printed: 08.07.2013 | Doc-Nr: PUB / 5071280 / 000 / 01
max
= 20 bar.
max
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 / TE MD20 LS HA /
TE MD20 LS IM / TE MD20 LS EM 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 sys-
tem (pilot contact switching). In addition, in the TE MD20
LS EM, TE MD20 LS and TE MD20 LS HA, a diode is fit-
ted between the pilot contact and the ground lead. A line
terminator is incorporated in the TE MD20 LS 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 PRCD /
TE MD20 LS HA PRCD / TE MD20 LS EM PRCD
to the electric supply
Ground fault circuit interrupters of the PRCD
incorporated in the supply cords of the TE MD20 LS
PRCD / TE MD20 LS HA PRCD / TEMD20 LS IMPRCD.
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).
type are