FRITSCH PULVERISETTE 9 - Manual (Page 32)

6.3.1 Speed
The speed of the drive motor (= oscillation frequency of the grinding set)
can be set between 600 and 1500 rpm in steps of 50. The speed is con-
stantly readjusted in narrow limits (+/- 1 %), so that the grinding results
are very well reproducible. In particular, it is possible with heavy grinding
sets that high speeds cannot be reached due to drive overload. This is
indicated by a reduced speed display.
Higher speeds increase the percentage of fine particles and
shorten the necessary grinding duration.
A low speed protects grinding stock and grinding set.
The speed can be set between 600 and 1500 rpm in steps of
50 rpm.
6.3.2 Pause
In case of a longer grinding duration, the duration of the cooling phase is
specified in connection here with REPEAT. 60 minutes are possible at the
most; 00 means no pause.
During the pause, the hood (1) remains locked.
6.3.3 Repeat
The combination of the grinding and pause times or REVERSE settings is
repeated according to the number entered here. Basically it is valid that
the programmed process cycle and then the number of repeats are run
in total.
n Example 1:
time = 5min, pause = 3min, repeats = 5 ® total 30min grinding,
15min pause (last pause is ignored).
n Example 2:
time = 3min, pause = 4min, repeats = 5, reverse active ® total
18min grinding, 20min pause and a reversal of direction of rotation
after every cycle.
n Example 3:
time = 1min, pause = 0min, repeats = 19, reverse active ® total
20min grinding, no pause and a reversal of direction of rotation after
every minute.
Using the device
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