Keypad And Display; Motor Protection - Weka SR25 Manual De Instrucciones

Fixing methods
Dowel fixing - The most common method of fixing is dowel fixing. Use only metal dowels.
Bracing - It is also possible to fasten the drill stand with a suitable quick shift column against a rigid wall.
Appropriate columns are offered by the diamond tool market.
With the SR-machine you can also drill overhead without any further precautions. For protecting the
operator against water, you should however on principal use a water collecting ring (accessory for drill
rig). Consider that the drilled core slips into the core bit and thus loads machine and drill rig additionally.
Bigger cores have to be secured accordingly.
4.4 Diamond drill bit
The SR-machine´s tool fixture consists of a shaft with a female thread of 1 ¼" UNC or the much easier
to loosen thread M33/3. Only use suitable high-quality diamond tools.
Only use appropriate diamond tools and ensure that the diamond segments are sufficiently larger than
the inner and outer diameter of the drill bit tube.
Apply water-resistant grease to the tool thread so that the tool can be easily loosened.
Fasten the drill bit tightly to the thread.
Ensure that the radial run out on the diamond segments of the drill bit is no greater than 1mm
(eccentricity).
Only use suitable wrenches for changing the core bit. Thereby hold the drilling spindle with another
wrench.
Never use a hammer or something similar to open the core bit. If necessary elongate the
wrench.
5. P U T T I N G I N T O O P E R A T I O N
5.1

Keypad and display

The SR-machine is fitted with a display. Via the keypad the motor can be started (green button) and
switched off (red button). Via the buttons + and - the speed can be preselected in 6 (4) steps. The
suitable drilling diameters are thereby shown in the display. When switching on by the start button the
motor is started with the preselected speed. The speed can also be changed while drilling, by simply
choosing the desired drilling diameter and pressing the start button again.
On the SR25/65 two diameters are displayed alternately. The first value corresponds to a cutting speed
of 2,5 m/s, the second value to the speed of 4,5 m/s.
On the SR38/68/75 three different drilling diameters are displayed alternately which refer to the three
gear speeds. The shown drilling diameters are calculated at the middle cutting speed of 3,5 m/s.
The speeds overlap in each step, thus at least two steps can be selected for one drilling diameter for
reaching the best possible results.
5.2 Soft Turn Feature
By pressing the + and - button at the same time, the soft turn feature is selected, which is shown by
alternating displaying the figures 000 and 999. After pressing the start button the machine turns with the
low speed of 40 rpm and a very low torque. With this selection the drill bit can be assembled
automatically safely.
5.3

Motor protection

The electronic motor protection controls the motor current and limits it to the maximum value. Thus the
speeds drops remarkably in case of an overload. If you relieve the motor then, the speed increases again
to the nominal speed. If you overload the motor further until the speed is dropped to zero, the electronic
switches the motor off after a few seconds.
If the motor is operated with too less cooling water, it is switched off by the integrated over temperature
protection. Immediately care for sufficient supply of cooling water (at least 1l/min) for quick cooling down
the motor.
In general care for sufficient supply of cooling water as otherwise the motor and the power
electronic can be damaged.
15