By buying this appliance, you have chosen a high quality
product. The appliance has a sturdy construction and is simple
to operate, thus ensuring ease of use. You can set speeds of
57 to 1300 1/min with the 50Hz (mains frequency) version and
speeds from 69 to 1560 1/min with the 60Hz (mains
frequency) version. The unit heats up during use. The ample
cooling surfaces on the motor serve to distribute and radiate
the heat as evenly as possible.
You can also use high-sided mixing vessels together with IKA
stands without any problem.
The unit comes without a connection cable because the user’s
installations mean that it is not possible to issue a standard-
length cable due to the different sizes of premises. Experts can
determine the pin assignment from the wiring plan.
The precision shaft is shaped as a hollow shaft and
accommodates stirrer shanks of up to 13 mm in diameter. It is
important to note here that these may only be inserted to just
before the top edge of the casing. You must also ensure that
the stirrer shank is securely clamped in the chuck.
The method of operation of the motor is characteristic of the
operating behavior of the RW 28 basic units. The motor can be
infinitely adjusted via a friction wheel drive unit but is operated
in one position only. The power output, rotational speed and
torque of the motor are regarded as constant and are
optimized for this operating position. After the friction wheel
drive the motor power output is transmitted to the off-drive
shaft of the stirrer via either the first or second stage of the
subsequent manually adjustable toothed gear train.
Neglecting all losses, the power at the off-drive shaft during
power transmission (conversion) is always as great as the
power output of the motor. The gear train merely provides rpm
and torque conversion, which can be described in purely
theoretical terms by the characteristic curve plotted in Fig. 1.
Friction wheel wear is kept low by a helical clutch matched to
the gear train. The down-pressure required at the friction
wheel is adjusted by the helical clutch according to the
moment acting on the stirrer shaft. A low torque results in a
low down-pressure; a high torque results in a high down-
pressure.
The ball race three-phase motor is maintenance-free. Its
attached switching unit features a special safety device for
operation in the case of overcurrent and undervoltage
(undervoltage release) to permanently disconnect the motor
and avoid thermal damage. The appliance can only be started
up again by activating the ON/OFF switch (
fig. 2
), when power
permitted for the motor is supplied.
You can find the basic connection and rating for the motor on
its rating plate.
The safety switch SI 400 can also be connected in the motor
switching unit. When used in combination with an IKA stand,
this allows the user to switch on the appliance only at a
defined height in the stand’s working range.
If the stirring unit is operated in such a way that the appliance’s
EMERGENCY OFF switch ( (B)-
fig. 2
) is not accessible, you
must add another EMERGENCY OFF switch to the work area
so that it can be easily reached.
13
RW47D102003
Useful facts
Drive
Motor circuit breaker
RW 47 D_def 09.02.2004 14:54 Uhr Seite 13
