Roller Centro S 1 Instructions D'emploi page 17

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examples of those that might arise, can lead to overloading of the drive
unit during drilling operations. You will normally hear the turning speed
of the motor drop, although the diamond core drilling crown may become
completely blocked. This can lead, especially during manually-controlled
boring, to torque-related jarring – which will affect the operation.
Important:Note that the diamond core drilling crown can become blocked
at any time. During manually controlled core drilling, there is a danger
of the drive unit jumping out of your hands.
In order to simplify the handling of the machine, and to avoid damage,
the ROLLER'S Centro S1, ROLLER'S Centro S3 and ROLLER'S Cen-
tro S2/3,5 are equipped with a multi-function electronic system, along
with a mechanical sliding clutch. The multi-function electronic system
performs the following tasks:
Initial-current limitation and jerk-free startup for smooth tapping.
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Limiting of idling speed in order to reduce noise and prevent wear to the
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motor and transmission.
Motor overload regulation relative to feed pressure. Before the drive unit
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can be overloaded by excessive feed pressure on the diamond core dril-
ling crown, or as the result of a blockage, the motor supply current – and
thus its turning speed – is reduced to a minimum. The drive unit does
not shut down however. As the feed pressure is reduced, the turning
speed of the drive unit is increased once more. This procedure, even if
it is repeated several times in succession, prevents damage to the drive
unit. If the motor remains stopped despite the reduction in feed pres-
sure, the drive unit must be shut down and the diamond-tipped annular
bit freed manually (see 5.).
Important: DO NOT switch the drive unit on and off in an attempt to
free a blocked diamond core drilling crown.
3.1. Manually-controlled dry boring ROLLER'S Centro S1 and
ROLLER'S Centro S3
Important: Never carry out manually-controlled drilling without first
fitting the holder-up. DANGER OF ACCIDENTS!
Screw the selected diamond core drilling crown onto the drive spindle
(11) of the drive unit, and lightly hand-tighten. There is no need to tighten
it with a wrench. Using the tapping tool (see 2.4.1.). Secure the drive
unit to the motor handle (20) and holder-up (12), and locate the tapping
tool at the centre of the desired core-drilling point. Activate the drive unit
at the switch (21).
Important: Avoid accidents: NEVER block the drive unit switch during
manually-controlled boring! If the drive unit is knocked out of your hands
as a result of a blocked diamond core drilling crown, a blocked switch
can no longer be released. The drive unit will then run out of control,
and the unit must be shut down by unplugging it from the mains supply.
To make a tapping hole, drill until the diamond core drilling crown has
bored to a depth of about 5 mm. Pull out the mains plug. Remove the
tapping tool, using a SW 19 wrench if required. Using the dust-extrac-
tion system (see 2.4.2.). Continue boring until the core-drilling operation
is complete. PREVENT ACCIDENTS: The drive unit should be held
firmly throughout in order to prevent torque-related jarring. Check to en-
sure correct stability. Carry out larger core-drilling operations with the
drill upright.
If the dust produced by dry boring is not removed, the diamond core dril-
ling crown may overheat and suffer damage. There is also a danger of
the compressed drilling dust in the drilling gap causing the diamond core
drilling crown to become blocked. If you need to work without the dust-
extraction system when handling fine-pored materials, pull the diamond
core drilling crown out at regular intervals and push it back in with a slight
turn, so that the drilling dust is expelled from the drilling gap.
Important: Always wet drilling for steel-reinforced concrete!
3.2. Manually-controlled wet drilling ROLLER'S Centro S1 and
ROLLER'S Centro S3
Important: Never carry out manually-controlled drilling without first
fitting the holder-up. DANGER OF ACCIDENTS!
Screw the selected diamond core drilling crown onto the drive spindle
(11) of the drive unit, and lightly hand-tighten. There is no need to tighten
it with a wrench. Connect the water supply (see 2.5.). Using the tapping
tool (see 2.4.1.). Secure the drive unit to the motor handle (20) and
holder-up (12), and locate the tapping tool at the centre of the desired
core-drilling point. Activate the drive unit at the switch (21).
Important: Avoid accidents: NEVER block the drive unit switch during
manually-controlled boring! If the drive unit is knocked out of your hands
as a result of a blocked diamond core drilling crown, a blocked switch
can no longer be released. The drive unit will then run out of control,
and the unit must be shut down by unplugging it from the mains supply.
To make a tapping hole, drill until the diamond core drilling crown has
bored to a depth of about 5 mm. Remove the tapping tool, using a SW
19 wrench if required. Adjust the pressure in the water supply system
(15) to a point where there is a moderate, but constant, flow for water
from the bore hole. Insufficient water pressure (where the waste mate-
rial flows out of the bore hole as thick sludge rather than liquid) is as bad
for the working efficiency and service life of the diamond core drilling
crown as is excessive water pressure, which causes completely clear
water to flow out. Continue boring until the core-drilling operation is com-
plete. PREVENT ACCIDENTS: The drive unit should be held firmly
throughout in order to prevent torque-related jarring. Check to ensure
correct stability. Carry out larger core-drilling operations with the drill
upright. Ensure that no water is allowed to get into the drive unit motor
during operation. DANGER OF FATAL ACCIDENT!
3.3. Ways of securing the drill upright
You are recommended to secure the drill upright without the drive unit
and diamond core drilling crown. The drill upright becomes top-heavy
when the drive unit is attached. This makes the task of securing it more
difficult.
3.3.1. Securing with plugs in concrete with knock-in anchor (Fig. 5)
For core-drilling operations in concrete, the drill upright should be secured
with a knock-in anchor (steel plug). Proceed as follows:
Mark plug hole at a distance of approx. 220 mm (drill upright S and D),
approx. 290 mm (drill upright D 300) from the centre of the core hole.
Make the Ø 15 mm plug hole, with a drilling depth of about 55 mm. Clean
the bore hole, hit the knock-in anchor (23) in with a hammer and spread
with the flattener (24). Use only knock-in anchors of approved type (art.
no. 079005). Observe approval! Screw the knurled threaded rod (25)
into the knock-in anchor and tighten it by holding a tool such as a screw-
driver in the transverse hole of the knurled threaded rod. Turn the four
adjustment screws (5) on the drill upright until they no longer protrude
from the sole plate. Position the drill upright with slot (7) on the knurled
threaded rod, while observing the desired position of the core-drilling
operation. Fit the washer (26) to the knurled threaded rod and use an
SW 19 wrench to secure the fast-tightening nut (27). Turn all four ad-
justment screws (5) with the SW 19 wrench to compensate for irregu-
larities in the ground surface. Take care to ensure that the locknuts do
not prevent movement of the adjustment screws. Tighten the locknuts
as required.
3.3.2. Securing with plugs in masonry, with expansion anchor
(anchor sleeve, fig. 6)
For core-drilling operations in masonry, the drill upright should be se-
cured with an expansion anchor (anchor sleeve). Proceed as follows:
Mark plug hole at a distance of approx. 220 mm (drill upright S and D),
approx. 290 mm (drill upright D 300) from the centre of the core hole.
Make the Ø 20 mm plug hole, with a drilling depth of about 85 mm. Clean
the bore hole, and push the expansion anchor (28) with knurled threa-
ded rod (25) into the hole. Screw the knurled threaded rod (25) fully
home and tighten it by holding a tool such as a screwdriver in the trans-
verse hole of the rod. Turn the four adjustment screws (5) on the drill
upright until they no longer protrude from the sole plate. Position the drill
upright with slot (7) on the knurled threaded rod, while observing the de-
sired position of the core-drilling operation. Fit the washer (26) to the
knurled threaded rod and use an SW 19 wrench to secure the fast-tigh-
tening nut (27). Turn all four adjustment screws (5) with the SW 19 wrench
to compensate for irregularities in the ground surface. Take care to en-
sure that the locknuts do not prevent movement of the adjustment screws.
Tighten the locknuts as required.
The expansion anchor can be removed after completion of the core-dril-
ling operation for reuse elsewhere. To do so, turn the knurled threaded
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