Speed - Normal Operation; Speed - Overload Operation; Output Shaft; Speed Display - IKA EUROSTAR 20 digital Instrucciones De Manejo

Speed - regulated (no variation in speed)
The speed is monitored and regulated by proces-
sor controlled. The target speed is constantly com-
pared with the actual rotation speed value of the
output shaft and variations corrected. This guar-
antees a constant speed even if the viscosity of
the substance being stirred changes.
The stirrer can deliver double output for a short
time to even out load peaks which could occurs,
for instance, if solid or semi-pourable agents are
added. If the operation is in the overload range
(e.g. process-related increase in viscosity), the actual
speed is reduced until the stirrer torque corresponds
to the nominal torque of the machine, and the tar-
get speed blinks. The possible speed is continually
adapted to operating conditions, guaranteeing that
speed is as close as possible to the target speed set.
To protect the machine from overload, the speed
is reduced if the machine has been operated in
overload mode. The target speed set then does
not correspond to the actual speed of the output
shaft. This condition is indicated by blinking of the
target speed (overload operation).
EUROSTAR 20/40/60/100 digital
The clamping chuck and output shaft permit clamp-
ing IKA recommend stirrer tools (see section "Per-
®
mitted Stirrer tools"). The output shaft is
IKA ®
designed as a hollow shaft and the opening on the
top side of the housing is closed with a plastic cover.
When the stirrer cover is opened, it is possible for
stirring shaft to be pushed out over the top edge
of the housing at standstill, e.g. during changing
container.
For safety reason, the stirrer cover must be pushed
back into the opening of the housing so that it is
properly closed. This is the only way to ensure that
working with the unit is safe and that media cannot
enter the instrument.
The rotation speed is adjusted with the rotary knob
(B, see Fig. 1) on the front of the overhead stirrer.
Speed – normal operation
Fluctuations in mains voltage within the permitted
tolerance range have no effect on the quality of
regulation and constancy of speed.
The speed is set using the front knob (B, see
Fig. 1). During normal operations the speed
value on the display (C, see Fig. 1) corresponds
to the speed of the output shaft in revolutions
per minute (rpm).
Speed – overload operation
Overload status 1:
The machine is already running in the overload
range, the target speed does not yet correspond
to the actual speed. This condition is maintained
as long as neither the motor current nor the tem-
perature exceeds the permitted limit values.
Display symbol: blinking of the target speed.
When the load goes back to the normal range,
the target speed stop blinking and correspond to
the actual speed.
Overload status 2:
When the machine meet a fluctuating load
which is over double of the nominal torque, the
actual speed of the stirrer shaft will go down
quickly to stop.
Display symbol: Er 4 (see section "Error codes").

Output shaft

EUROSTAR 20 high speed digital
The output shaft has cone seat specially for preci-
sion shaft. Stirring elements can be screw-connect-
ed on the precision shaft (see Fig. 5).

Speed display

The rotational speed is displayed directly in revolu-
tions per minute (rpm) on the display (C, see Fig. 1).
Please see section "Safety
DANGER
instructions"!
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