KRESS WS 6390 E, Operating Instructions Manual

Page: 7 / 36

English
Technical data
Input watts 900 Watt
Output watts 480 Watt
Idle/Load speed rpm 4500–11500
Max. wheel diam. 125 mm
For rouging and parting wheels,
permissible peripheral speed up to
80 m/s
Wheel attachment hole diam. 22 mm
Spindle clamping thread M 14
Weight 1.75 kg
Use
The angle grinder can be employed universally for cutting
and working various types of metal and stone. Use only
permissible cutting and grinding instruments when opera-
ting the machine at high speeds.
Safety instructions and prevention of accidents
Before operating the machine, please read through the
operating instructions completely, follow the
Safety In-
structions in this manual as well as the general Safety In-
structions for Power Tools in the accompanying booklet.
Safety regulations
(DIN 66069 und EN 68)
The following procedures must be strictly adhered to:
1. Grinding wheels should always be stored in such a
way as to protect them from damage.
2. Only fiber-reinforced or diamond grinding and cut-
ting-off wheels may be used (for max. diam. see
name plate).
3. All grinding wheels etc. which are used must have
been approved for peripheral speeds of 80 m/s!
Formula: d
3.14 n = m/s
60000
d = diameter of grinding wheel in mm
n = idling speed min -1
(see nameplate)
m/s = meters per second
Example of grinding wheel of 125 mm diam. with an
idling speed of 10000 min
-1 :
125 3.14 10000 = 65.41 m/s
60000
i.e. the peripheral speed on the machine is less than
the max. permissible peripheral speed of the grind-
ing wheel. The grinding wheel may therefore be
used.
4. Under no circumstances may abrasive wheels be
used with a speed that is higher than that specified
by the manufacturer in rev/min.
5. Persons working with an angle grinder must always
wear some kind of eye protection (safety goggles)!
6. For the mounting of grinding wheels, only spring
flanges of the same size and with bearing surfaces of
the same shape may be used. Please note the points
regarding use of the spring flange in the oper-
ating instructions. Intermediate shims may not be
used on conical or offset grinding wheels.
7. When mounting recessed abrasive wheels, the dia-
meter of the spring flange must be at least 5 mm
smaller than the diameter of the flat recess surface
of the abrasive wheel and must not press on the
transitional curve of the recess.
8. The location holes of grinding wheels must not be
bored afterwards because of the danger of break-
age this involves.
9. The grinding wheels must sit on the spindle in such
a way that they are easily moveable without being
too loose. The adjusting nut must be made just tight
enough to hold the grinding wheel firmly in place.
10. A new grinding wheel or any newly mounted grind-
ing wheel must be allowed to run idle for half a mi-
nute in the machine it is to be used on. Operating
and other personnel must stand outside the danger
area during the trial area.
11. Grinding wheels must not be be brought to a stop
by applying pressure to the periphery or to the face
of the wheel.
12. If, during the installation of flanges, a bushing hap-
pens to be present, it must be ensured that it does
not protrude so far over the sides of the abrasive
wheels as to touch the flange. The bushing must be
sufficiently thick to ensure that it sits firmly in the
grinding wheel hole.
13. Cutting off and grinding may only be carried out
with the protective cover on!
14. Before every change of a grinding wheel the mains
plug must be pulled!
15. The addtional grip is provided for your safety. Al-
ways work with the additional grip attached.
16. The dust produced when working with crystalline
silicic acid is harmful to health.
17. Do not use the grinder on any material containing
asbestos. Observe the applicable regulations for
your country.
18. Also applicable to this tool are the separately en-
closed safety notes, which we recommend follow-
ing.
19. Outside power sockets must be protected with re-
sidual-current-operated circuit-breakers (r.c.c.b.).
20. Do not drill holes into the housing to label the ma-
chine. The protective insulation will be bridged.
Please use self-adhesive labels.
21. Always lead cables away towards the back of the
machine.
Double insulation
Our equipment is designed in accordance with European
regulations (EN standards) for the utmost safety of the
user. Machines with double insulation always carry the in-
ternational
symbol. The machines do not require earth-
ing. A two-core cable is sufficient.
The machines are interference-suppressed in accordance
with EN 55014.
Initial operation
Before the first operation check that the mains voltage cor-
responds to that given on the machine nameplate.
Switching the machine on and off
The machine is started by sliding the switch ring (1) in the
direction of the arrow. The toggle lever (2) will then auto-
matically engage in the foremost slide position. Pushing on
the tilted front edge (3) of the lever (2) disengages the lever
and causes the switch ring (1) to rotate back into its origi-
nal position automatically. The machine comes to a stand-
still.
Full-wave control electronics with electronic motor
protection monitoring
The following advantages are integrated into the full-wave
electronics:
Soft start
The start-up current limiter reduces the start-up current.
The motor accelerates slowly to the preselected speed,
protecting the operator and the gearbox and extending the
service life of the machine.
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