23
The indicated weighted effective value of acceleration has been measured
against standard test procedures and can be used by way of comparison with
another device. The indicated weighted effective value of acceleration can also
be used as a preliminary evaluation of the exposure.
CAUTION
CAUTION
The indicated weighted effective value of acceleration can differ during opera-
tion from the indicated value, dependent on the manner in which the device is
used. Dependent upon the actual conditions of use (periodic duty) it may be
necessary to establish safety precautions for the protection of the operator.
2 Initial startup
2.1 Electrical connection
WARNING
WARNING
Caution: Mains voltage present! Before connecting the electric diamond core
drilling machine, check whether the voltage given on the rating plate corresponds
to the mains voltage. Only use sockets/extension leads with a functioning
protected earth contact. The function of the PRCD fault current circuit breaker
(19)) must be checked every time before start-up:
1. Plug the mains plug into the socket.
2. Press the RESET button (17), the PRCD control lamp (16) lights red
(operating state).
3. Protector out the mains plug, the PRCD control lamp (16) must go out.
4. Plug the mains plug back into the socket.
5. Press the RESET button (17), the PRCD control lamp (16) lights red
(operating state).
6. Press the TEST button (18), the PRCD control lamp (16) must go out.
7. Press the RESET button (17) again, the PRCD control lamp (16) lights red.
The electric diamond core drilling machine is ready for operation.
WARNING
WARNING
If the described functions of the PRCD fault current circuit breaker (19) are not
fulfi lled, the device may not be used. There is a danger of electric shock. The
PRCD fault current circuit breaker tests the connected device, not the installa-
tion before the socket nor interconnected extension leads or cable reels.
ROLLER’S Centro DP is delivered without a PRCD fault current circuit breaker
and is suitable for dry drilling only. Wet drilling with, as well as connection of a
water hose to the ROLLER’S Centro DP is not permitted. There is a danger of
electric shock.
On building sites, in a wet environment, indoors and outdoors or under similar
installation conditions, only operate the electric diamond core drilling machine
on the mains with a fault current protected switch (FI breaker) which interrupts
the power supply as soon as the leakage current to earth exceeds 30 mA for
200 ms. When using an extension lead, a cable cross section suitable for the
power of the electric diamond core drilling machine must be chosen.
2.2 ROLLER’S Centro drive units
The ROLLER’S Centro S1, ROLLER’S Centro S3, ROLLER’S Centro S2/3.5
and ROLLER’S Centro SR drive units are universally applicable for dry or wet
drilling, hand-held (ROLLER’S Centro S1, ROLLER’S Centro S3 and ROLLER’S
Centro SR) or with a drill stand. The combined drilling crown connection of the
drive spindle (11) of ROLLER’S Centro S1, ROLLER’S Centro S3 and ROLL-
ER’S Centro SR allows both the direct mounting of universal diamond core
drilling crowns with UNC 1¼ female thread and with G ½ male thread. The
ROLLER’S Centro S1, ROLLER’S Centro S3 and ROLLER’S Centro SR drive
units are not delivered with the water supply system (15) pre-assembled but
loose. The adapter for the water connection on the Centro S1, Centro S3 and
Centro SR drive machines is closed by a cover (14). In this condition the drive
machines (Centro S1, Centro S3 and Centro SR) are used for dry drilling. The
water feed device is already pre-assembled on the ROLLER’S Centro S2/3,5.
For wet drilling, see 2.5.
The ROLLER’S Centro DP drive unit with micro-pulse technology that can be
switched on and off is used especially for dry drilling, hand held or with a drill
stand. The combined drive spindle (11) of ROLLER’S Centro DP allows both
direct mounting of the dry diamond core drilling crowns with UNC 1¼ female
thread and the tapping tool with G ½" male thread and has an integrated suction
rotor for dust extraction with a connection for ROLLER’S Protector M and other
suitable vacuum cleaners.
NOTICE
NOTICE
The G ½" connection thread in the drive spindle (11) of ROLLER’S Centro DP
may not be closed for drilling with, for example, a core drilling crown, an adapter
or similar because this bore is intended for dust extraction.
The drive-unit turning speed required for cost-effective core drilling depends
T
T
on the diameter of the diamond core drilling crown. Select the turning speed
of the drive unit in such a way that the peripheral speed (cutting speed) of the
diamond core drilling crown runs within a range between 2 and 4 m/s. It is of
course possible to carry out drilling operations outside this optimum range,
albeit subject to reductions in the operating speed and/or service life of the
diamond core drilling crown. Higher peripheral speed apply in masonry.
The turning speed of the ROLLER’S Centro S1 is adjusted to a fi xed setting.
From a drilling diameter of 62 mm, the ROLLER’S Centro S1 operates in
concrete in the optimum peripheral speed range, which always remains inside
acceptable limits when smaller diameters are being handled. The attachment
method used with the diamond-tipped segments of the ROLLER’S Universal
diamond core drilling crown has been modifi ed so that smaller diameters can
also be drilled effi ciently with the ROLLER’S Centro S1.
The turning speed of the ROLLER’S Centro S3 can be selected by means of
a three-speed stepped drive to ensure that in concrete it always operates within
the optimum drilling speed range. The correct speed can be taken from the
machine rating plate (Fig. 7) of the ROLLER’S Centro S3. The fi rst column of
the table shown there covers speeds 1 to 3, the second column shows the
corresponding turning speeds, the third column the core bit diameters for
masonry and the fourth column contains core bit diameters for steel-reinforced
concrete. It shows, for example, that a Ø 102 mm core-drilling operation in
masonry should be carried out in third speed, while drilling into steel-reinforced
concrete requires the use of fi rst speed.
The turning speed of ROLLER’S Centro S2/3,5 can be selected by a 2-step
switching gear so that it always drills in an optimum area. The right gear can
be read from the rating plate (Fig. 8) of ROLLER’S Centro S2/3,5. The table
there shows gears 1 and 2 in the fi rst column and the corresponding speeds
in the second column and the drill crown diameters for masonry and steel-
reinforced concrete in the third column.
The rotation of the ROLLER’S Centro SR can be selected via a 2-gear stepped
drive in combination with a stepless electronic speed regulation to ensure that it
always operates within the optimum drilling range. The correct speed can be taken
from the table (Fig. 9). The correct gear step is selected at the handle grip (39),
the correct rotation via the electronic speed regulation at the dial (57). The electronic
speed regulation keeps the selected speed largely constant also under load.
The turning speed of ROLLER’S Centro DP is adjusted to a fi xed setting. The
diamond-tipped segments of the ROLLER’S dry diamond core drilling crowns
TDKB LS are specially designed for dry drilling in concrete/steel-reinforced
concrete, masonry and other materials using the micro-pulse technology with
ROLLER’S Centro DP without water.
WARNING
WARNING
Wait for the machine to come to a halt before engaging the transmission!
W
W
Never try to do this during operation or outfl ow. Protector out the mains plug if
a gear cannot be switched! At the same time, turn the switch handle (39) and
move the drive spindle/diamond core drilling crown by hand.
2.3 ROLLER’S universal diamond core drilling crowns UDKB, inductively
soldered and resolderable.
ROLLER’S universal diamond core drilling crowns UDKB LS, laser-welded
and high temperature resistant.
ROLLER’S universal diamond core drilling crowns are developed especially for
common drilling operations. The connection thread of the ROLLER’S universal
diamond core drilling crowns UNC 1¼ is compatible with ROLLER’S Centro
S1, ROLLER’S Centro S3, ROLLER’S Centro S2/3.5 and ROLLER’S Centro
SR and suitable drive units from other suppliers. If the connection thread of
the drive unit proves to be incompatible, adapters are available as accessories
(22).
ROLLER’S dry diamond core drilling crowns TDKB LS, laser-welded and
high temperature resistant.
The ROLLER’S dry diamond core drilling crowns TDKB LS are designed espe-
cially for dry drilling,hand-held or with a drill stand, for core drilling machines
with micro-pulse technology, e.g. ROLLER’S Centro DP and suitable drive units
from other suppliers. The connection thread of the ROLLER’S dry diamond core
drilling crowns UNC 1¼ is compatible with ROLLER’S Centro DP and suitable
drive units of other suppliers. If the connection thread of the drive unit proves
to be incompatible, adapters are available as accessories (22).
The cutting characteristics of the diamond core drilling crown are determined
by the quality of the diamonds, the particle-size and shape of the diamonds,
and also by the bonding agent – the metal powder in which the diamond parti-
cles are set. Users who need to carry out a variety of core-drilling operations
should keep a range of diamond core drilling crowns of different sizes to hand
in order to optimise the cutting process. It is often only possible to check on
site which diamond core drilling crown is best suitable for a drilling operation
with regard to cutting performance (operating speed) and useful life. You may
even have to contact the manufacturer of the diamond core drilling crown on
various occa sions in order to fi nd out which bit should be used.
NOTICE
NOTICE
ROLLER’S universal diamond core drilling crowns UDKB and UDKB LS are
not suitable for using with ROLLER’S Centro DP with micro-pulse technology
to drill core holes.
NOTICE
NOTICE
When performing dry drilling with ROLLER’S TDKB LS
dry diamond core
drilling crowns and the ROLLER’S Centro DP core drilling machine with
micro-pulse technology, it is necessary to extract the health hazardous drilling
dusts from the drilling gap with a suitable safety vacuum cleaner of dust class
M, e.g. ROLLER’S Protector M. Observe the national regulations.
2.3.1 Fitting the diamond core drilling crown
22
WARNING
WARNING
Unplug from the mains power supply! Screw the selected diamond core
Unplug from the mains power supply!
Unplug from the mains power supply!
drilling crown onto the drive spindle (11) of the drive unit, and lightly hand-tighten.
It is an advantage to insert the quick-release ring ((54) accessory art. no.
180015) between the diamond core drill crown and the drive spindle. Firm
tightening with an open-ended wrench is not necessary. Note that the threads
on the drive spindle and diamond core drilling crown must be clean.
eng eng
