6
Speed – overload operation
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 vis-
cosity), the actual speed is reduced until the stirrer torque
corresponds to the nominal torque of the machine, and
the target 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 overloading, the speed is re-
duced 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).
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 temperature 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 stir-
rer shaft will go down quickly to stop.
Display symbol:
Er 4
(see section “
Error codes
“).
Drive
The speed can be adjusted continuously over two speed range (speed range
I
, speed range
II
) with the knob (B, see
Fig. 1
).
Motor protection
The stirring instrument is suitable for continuous operation.
The motor current is limited electronically. The instrument
has an anti-stall and anti-overload system.
Speed – normal operation
Speed - regulated (no variation in speed):
The speed is monitored and regulated by processor con-
trolled. The target speed is constantly compared with the
actual rotation speed value of the output shaft and varia-
tions corrected. This guarantees a constant speed even if
the viscosity of the substance being stirred changes.
Fluctuations in mains voltage within the permitted toler-
ance 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
). Dur-
ing 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).
If a fault occurs, a safety circuit immediately switches off the
motor permanently through a relay in the power board. A
fault occurs if the safe functioning of the instrument is com-
promised.
Unpacking
• Unpacking:
- Please unpack the device carefully
- In the case of any damage a detailed report must be sent
immediately (post, rail or forwarder).
• Delivery scope:
-
EUROSTAR 400 digital
overhead stirrer
- extension arm
- 2 hexagonal socket screws
- hexagon socket offset screw key
- chuck key
- user guide
- warranty card.
