Retsch PM 400 - Manual (Page 25)

08.02.2012 Retsch GmbH
25
Doc. Nr. GB 98.535.9999
pressing.
You can now “Delete programme” or “Cancel”„
You will then be returned again to the programme mode level.
Starting time
Start in xx h
Cancel Starting the milling process can be preselected here, in
steps of 01 to 99 hrs.
The PM400 is started with the preselected milling time, speed and reversal of direction of rotation
after the set starting time has elapsed. The countdown up to starting the machine is shown in the
display.
Ensure that the milling cups are properly clamped and balanced
before you start the machine unattended.
Even though starting without the lid closed is not possible, make
sure that the lid is closed before you start the machine
unattended.
You can interrupt running of the starting time at any time with the STOP button and with the main
switch on the rear side of the unit. You then have to reprogramme the starting time.
Opening automatic
MENU SETTINGS OPENING AUTOMATIC
Here you can preselect whether the milling chamber lid is to be automatically lifted at the end of milling or is to
be opened only by pressing the knob. If the function is switched off the pictogram
zur appears in the display to confirm this.
Power
MENU SETTINGS POWER
With this function you can determine the total power (milling power + power loss) put into the milling cups.
This total power input into the milling cups is defined as the difference between the power consumed by the
drive of the machine with the milling cups filled with milling material and milling medium compared with empty
milling cups.
First of all the no-load power consumed by the machine with empty milling cups must be determined. The level
of no-load power is determined only over a relatively short period and is considered as zero point from the
electronics – in a similar way to the taring of weighing scales.
During subsequent milling of the material only the power input which extends beyond the level of no-load
power is considered. This difference is equivalent to the power which is put into the milling cup(s) through the
milling medium and milling material.
For comparison purposes of various parameter combinations the power input can also be specified instead of
the milling time. (For comparability only the milling material quantity and the charged grain size must be the
same). In this case the milling process is ended not after a specified time but after input of the specified power.
The power menu is divided into three further sub-menus:
DETERMINE NO-LOAD POWER
MEASURE
SPECIFY
In order to determine the power input into the milling cups during your milling process please proceed as
follows:
Preset all the parameters – speed, milling time, interval, necessary for the intended milling process.
Determine the weight of the milling cup intended for the subsquent milling process – still without milling
material and milling medium.
Set the balancing weight accordingly.