Retsch PM 200 - Manual (Page 31)

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Retsch GmbH
31
Start time
Start in xx h
Cancel
The start can be pre-selected from 01 to 99 h here.
The PM100/200 is started at the pre-selected grinding time, speed and reverse rotation after the
specified start time has expired.
Make certain that the grinding bowls have been securely clamped
and balanced before letting the machine start unattended.
Even though it is not possible to start the machine without the
cover closed, ensure that the cover is closed before letting the
machine start unattended.
Once running, the start time can be interrupted at any time with the STOP button and from the
main switch at the rear of the machine. The start time must then subsequently be re-programmed.
Opening mechanism
MENU SETTINGS OPENING MECHANISM
This allows you to pre-select whether the grinding chamber cover should be raised automatically after grinding
has ended or may only be opened after pressing the button. If the function is switched off the
pictogram appears on the display for confirmation.
Energy
MENU SETTINGS ENERGY
This function enables the total energy input into the grinding bowl (comminution energy + loss energy) to be
determined.
This total energy input into the grinding bowl is defined as the difference between the energy drawn from the
machine's drive unit when the grinding bowl is empty and when it is filled with material to be ground and
grinding balls.
Thus it is first necessary to determine the idling energy drawn by the machine when the grinding bowl is empty.
The idling energy level is established over a relatively short period and is taken as the zero point by the
electronics, in a similar way to taring scales.
During subsequent grinding with material, the only energy input taken into account is that which exceeds the
level of idling energy. This difference can be regarded as equal to the energy input into the grinding bowl(s) by
the grinding media and the material being ground.
For the purpose of comparing different combinations of parameters, the energy input can be specified instead
of the grinding time (only the volume of the material being ground and the feed grains need to be the same to
allow a proper comparison to be made). In this case, the grinding process is not ended after a specified time,
but rather after the input of the pre-set energy.
The energy menu is divided into three sub-menus:
DETERMINE IDLING ENERGY
MEASURE
SET
In order to determine the energy input into the grinding bowl during the grinding process, please proceed as
follows:
 Specify all the parameters - speed, grinding time, interval - required for the intended grinding process.
 Determine the weight of the grinding bowl intended for the subsequent grinding process but still
without the material to be ground and the grinding media.
 Set the balancing weight accordingly.
 Then change to the sub-menu:
 DETERMINE IDLING ENERGY
 Clamp the grinding bowl securely into the machine, but still without the material to be ground and the
grinding media.