7
Accessories must be assembled according to the following assem-
bly instructions (
Fig. 2
to
Fig. 7
).
If above conditions are met, the device is
ready for operation after plugging in the
mains plug.
Speed – overload operation
In order to overcome peaks in the load such as arise when a solid
or viscous medium is added, the stirrer can be run for a brief pe-
riod at twice its rated power. When running in the overload range
(for instance if the viscosity has increased at a particular stage of
the process) the speed will be reduced to a degree sufficient to
keep the torque on the stirrer shaft within the rated torque of the
device.
The speed is continually adjusted whilst the stirrer is running to
correspond to the operating conditions and so that it matches the
set speed as closely as possible.
Overload status 1:
The device is already running within the overload range, whereby
the actual speed does not match the set speed. This condition is
maintained as long as neither the motor current nor the tempera-
ture exceeds their permissible limit value.
This is indicated by the torque value flashing in the display.
Once the load reduces to a value within the normal range again,
the torque value ceases to flash.
Overload status 2:
If the device is subjected to a fluctuating load which causes the
torque to be more than double the normal torque, the actual
speed of the stirrer shaft is quickly reduced to zero.
Message in the display: Error 4 (see “Error codes” section).
Output shaft
Speed display
The speed is set using the rotary knob (B, see
Fig.1
) on the front
of the
WiCo
.
The speed is displayed directly in revolutions per minute (rpm) in
the display (C, see
Fig.1
) of the
WiCo
.
Commissioning
Assemble the overhead stirrer and all necessary accessories on a
stable, even, non-slip surface. The overhead stirrer must be se-
cured to a stable stand (e.g.
R 2722
or
R 2723
) with a cross-
sleeve (e.g.
R 270
). The stirring vessel must always be securely
fixed for safety reasons. You must also ensure that the mounting
device (stand) is set up in such a way that it is not liable to topple
and does not start to move during the stirring procedure.
Securing
The clamping chuck and output shaft permit clamping
IKA
®
recom-
mend stirrer tools (see section “
Permitted IKA
®
Stirrer tools
“).
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 device.
NOTICE
Please see section “Safety instructions“!
Securing the extension arm to the overhead stirrer
Diagram
(see Fig. 2)
Ensure that the extension arm is fitted securely.
Vibration may cause the screw to become loose. It is therefore
necessary for safe use to occasionally check that the extension
arm is attached securely. Tighten the hexagonal socket screw as
required.
Securing the overhead stirrer to the stand
Diagram
(see Fig. 3)
First secure the cross sleeve (H) to the stand (I). Then secure the
extension arm (J) of the overhead stirrer in the open side of the
cross sleeve which is facing upwards. Once you have set the po-
sition required for the stirring procedure, firmly tighten the two
clamping bolts (G).
Check that the stirrer is held in position firmly prior to each use and
also at regular intervals. The position of the stirrer must only be
adjusted when the equipment is stationary and the power supply
is disconnected.
Securing the stirring element using the chuck
Diagram
(see Fig. 4)
Slide the stirring element (M) into the chuck (L). Tighten the chuck
firmly using the chuck key (K).
The stirring element must only be changed when the equipment is
stationary and the power supply is disconnected.
Securing the stirring shaft protector
Diagram
(see Fig. 5)
Use a stirring shaft protector (Q), e.g. R 301, to provide protection
against injury when working with the device.
Use the bolts (U) to attach the plastic half-shell pieces to the stir-
rer (T), as shown in Fig. 5. The screw (S) can be used to adjust the
length of the stirring shaft protector.
Check that the stirring shaft protector is held in position securely
prior to each use and also at regular intervals. The position of the
stirring shaft protector must only be adjusted when the equipment
is stationary and the power supply is disconnected.
