10
Motor circuit breaker
The ball race three-phase motor is maintenance-
free. Its attached switching unit features a special
safety device for operation in the case of over-
current and under-voltage (under-voltage release)
to permanently disconnect the motor and avoid
thermal damage. The instrument can only be
started up again by activating the ON switch (A,
see
Fig. 1
), 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
to the motor switching unit. When used in combi-
nation with an
IKA
®
stand, this allows the user to
switch on the instrument only at a defined height
in the stand’s working range.
If the stirring unit is operated in such a way that
the instrument’s
OFF
switch (B, see
Fig. 1
) is not
accessible, you must add another
EMERGENCY
STOP
switch to the work area so that it can be
easily reached.
Gear speed change
You can select one between two gear positions (
I
and
II)
using the toggle button (E, see
Fig. 1
) on
the front of the instrument. You can only switch
to a different cog wheel gear level when the in-
strument is switched off (motor stopped).
Otherwise this may cause damage to the gear
cogs. The arrow on the front foil indicates the di-
rection of the chuck.
Only change the gear posi-
tion at standstill!
WARNING
Speed display
The rotation speed is adjusted by means of the
rotary knob (C, see
Fig. 1
) on the side of the over-
head stirrer.
Commissioning
The overhead stirrer
RW 47 digital
must be se-
cured to a stable stand (e.g.
R 474
or
R 472
) with
four screws and wired according to the wiring dia-
gram for proper use. The stirring vessel must al-
ways be well secured for safety reasons. You must
also ensure that the mounting equipment (e.g.
floor stand, telescope 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. Accessories
must be assembled and wired according to the as-
sembly instructions (
Fig. 3
to
Fig. 7
).
Output shaft
The clamping chuck and output shaft permit clamp-
ing
IKA
®
recommend stirrer tools (see “
Permitted
IKA
®
Stirrer tools
“ section).
The output shaft is not designed as a hollow shaft.
Please see section “Safety
instructions“!
If the stirring unit is operated in such a way that the
instrument’s
OFF
switch (B, see
Fig. 1
) is not ac-
cessible, you must add an another
EMERGENCY
STOP
switch to the work area so that it can be
easily reached.
The rotation speed is displayed directly in revolutions
per minute (rpm) on the display (D, see
Fig. 1
).
DANGER
