NOTE: Because the LN sensor will stop and abort a run if the level of liquid nitrogen level
falls too low, it is important to top off the liquid nitrogen before every run, and at regular
intervals during extended runs. In no case should a program include more than twenty minutes of
total grinding time (for example, 10 cycles at 2 minutes each in T1).
4.12
PROGRAMMING
The user may modify any of five parameters: number of cycles (CYC), grinding time per cycle
(T1), cooling time per cycle (T2), pre-cooling time (T3), and impact frequency. To program
cycles, T1, T2, or T3 push the function key and then the numerical keys. To change impact
frequency, just press the INCREASE (↑) or DECREASE (↓) key.
Note: A full grinding program consists of a pre-cooling period followed by several grinding
cycles; each cycle consists of a grinding period followed by a period of cooling, except at the end
of a program where no further cooling is needed.
Cycles and impact frequency settings are entered as whole numbers. Cooling and pre-cooling
times are programmed in tenths of a minute; for example, 1.4 minutes = 1 minute and 24
seconds. These settings may be entered directly with the numeric keys, or adjusted with the
INCREASE/DECREASE (↑↓) keys. In programming cycles or frequency the INCREASE key
(↑) advances 1,2,3, etc., up to 15, and back to 1, while the DECREASE key (↓) cycles 9,8,7, etc.,
and from 1 to 15. If you try to enter a setting outside the programmable range the mill will
“beep.”
Once a parameter is set, pressing the ENT key enters that value in temporary memory, which
holds a value until the power to the mill is turned off. To transfer a setting from temporary to
permanent memory, press the 0 and ENT keys simultaneously. (Regardless of what is entered in
the temporary memory, it is wiped clean every time power is switched off.) When the
Freezer/Mill is switched on, the permanent-memory settings are restored, with the exception of
impact frequency, which is always stored as 10. Both the temporary and permanent memories
can hold only one setting per parameter.
Any programmed change in cycles, grinding time, cooling time, or pre-cooling time must be
individually placed in temporary memory as it is entered by pressing the ENT key. All such
programmed changes can be cumulatively transferred to permanent memory by pressing the
ENT and 0 keys simultaneously after all changes have been made.
CYC: Cycles. One cycle consists of a period of grinding time (T1) followed by a period of
cooling time (T2). On the last cycle in a grinding program, the Freezer/Mill skips T2 and goes
directly to Stop Mode (the LED display flashes “END” for several seconds) and then Program
Mode. The maximum number of cycles per program is 90. A typical program has 3 or 4 cycles.
To program the number of cycles press the CYC key. The cycle display will flash. Enter a
number using the numeric keys or the INCREASE/DECREASE arrow keys (↑↓).
Press the ENT key to load the number of cycles into temporary memory. (If you want to store
this information in permanent memory right away, press the ENT and 0 keys simultaneously.)
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