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3.3 Overload protection
Hilti diamond coring systems are
equipped with mechanical, electronic,
thermal and optical overload protec-
tion devices.
Mechanical clutch
Protects the motor and core bit in
case the core bit suddenly sticks.
Electronic protection
In case of overloading caused by
excessive drilling feed pressure, motor
current is reduced automatically so
that the core bit then only rotates
slowly. On reducing feed pressure,
current input returns to normal and the
motor continues to run at full power.
3.4 Instructions and precautions for overhead coring
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4. Technical data
Voltage
Current input
Power input
Frequency
Core bit diameter range
Speeds under no load:
1st speed: 1200 r.p.m.
2nd speed: 2400 r.p.m.
3rd speed: 3900 r.p.m.
Weight (motor unit)
Length of supply cord
Chuck
Electronic idling speed regulator
Overload current regulator
Optical overload indicator
Built-in starting current regulator
Thermal overload protection
Mechanical slip clutch
Protection class 1 (mains supply with earth/ground connection required)
Radio and TV interference suppression as per EN 55014
Reaction in mains supply as per EN 60555, part 2
Approved as per IEC 1029
The noise produced by this appliance has been measured according
to IEC 59 CO 11, IEC 704, DIN 45635, part 21, NFS 31-031 (84/537 / EWG).
The noise level under certain operating conditions may exceed 85 dB (A). In this
case, the operator must wear suitable ear protectors.
This Product is Listed by
Underwriters Laboratories Inc. and Bears the Mark:
4
Printed: 07.07.2013 | Doc-Nr: PUB / 5069608 / 000 / 00
Protection against overheating
The motor is protected against over-
heating by a sensor which auto-mati-
cally reduces current input in case of
sustained overloading and at high
ambient temperatures. The machine
can be operated normally after the
temperature of the motor windings
has dropped to a satisfactory level.
The motor windings can be cooled
more quickly by allowing the motor to
run without load.
For safety reasons, the following
equipment must be used when coring
overhead:
1. Baseplate fastened to the ceiling
using an HDI
1
/
˝ anchor
2
2. Water collector complete with
appropriate sealing disc
3. Hose strain relief clamp
4. Water removal hose
5. Adaptor for wet vacuum cleaner
6. 6 mA GFCI ground fault circuit
interruptor
7. Supply cord with earth / ground
conductor
100 V
115 V
15 A
15 A
1400 W
1600 W
50/60 Hz
8 – 82 mm
Core bit diameter range / speeds:
1st speed: 37 – 82 mm
2nd speed: 18 – 40 mm
3rd speed: 8 – 24 mm
approx. 6.2 kg
4 metres
DD-BI quick-release chuck
U L
R
Overload indicator
The overload indicator lights when the
motor is being operated at maximum
load. It is recommended that it is oper-
ated so that overload indicator does
not light continually (e.g. reduce coring
pressure).
8. Wet vacuum cleaner
A vacuum cleaner designed for
removing water and wet material
must always be used for overhead
coring.
9. Three-way water connection
10. Rail stop (stops carriage on rail)
Close the water supply valve and drain
the water from the core bit at the
three-way water connection before
withdrawing the core bit from the
water collector.
230 V
8 A
1700 W
Note: The life of the sealing discs can
be extended by applying a little grease
(e.g. bearing grease) or Hilti lubricant
spray.
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