Retsch BB 50 - Manual (Page 25)

Operating the machine
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5.8
39B
Reverse grinding
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Fig. 16: Bridging effect in the grinding chamber
Fig. 17: Reverse button
Using the reverse function you can release grinding material in the event of a
blockage in the machine or of bridging.
• Stop grinding.
• Press the reverse button (F5).
The machine will run backwards as long as you keep the reverse button pressed,
and wedged material will be dislodged.
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5.9
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Setting the Speed
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Fig. 18: Setting the speed
• Switch the machine on at the main switch.
The selectable grinding speed lies between 550 and 950 revolutions per minute
• Briefly press button (F4 +) to increase the speed in increments of 50.
• Briefly press button (F4 -) to decrease the speed in increments of 50.
When pressed for longer the speed levels are run through quickly. The display
shows the last value which is updated when the button is released.
F5
F2
bb
F4