5. Operating
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– MRF-M2 -E - V0.7 - 23.04.2021
5.5 Explanation of the operating modes
5.5.1 OFF mode (Stand-by)
If ‘OFF’ is shown in the display, the controller is in stand-by mode.
CAUTION: The control unit is live even when switched off!
5.5.2 Cooling mode
The
cooling mode is started
from the OFF mode.
MANUALLY
DIGITAL
by pressing the COOL button
via digital
input “Remote start to cooling“
(If parameterized
– [A21=1])
Subject: Cooling start delay
If “Cooling start delay” [P61] is programmed, the compressor starts after a delay, in
order to prevent a small amount of milk in the tank from freezing. During the cooling-
start-
delay LED “COMPRESSOR” is blinking
Note: If you p
ush the button “COOLING” twice, cooling will start immediately without
a delay - the LED will be lit continuously
.
There are various cooling start delay options. See section 7.7
After the start of the cooling mode
- the "COMPRESSOR" LED lights up (or flashes in the case of a cooling start
delay). The "COMPRESSOR" LED shows the current switching status of the
compressor.
- the "AGITATOR" LED lights up.
- t
he “T1” or “T2” LED (for target temperature 1 or 2) lights up.
- The pre-set target temperature T1 or T2 flashes three times in the display, then
the current temperature of the milk is shown.
If the other target temperature is required: Press the “T1 / T2” button for 3 sec-
onds. (Various switching options can be set. See parameter [P80]).
The milk is now cooled down to the set target temperature, and the agitator runs
continuously during cooling. If the milk temperature is already below the target, just
the agitator runs for the time being.
- When the target temperature is reached, the compressor switches off.
-
At the end of the set “after-stirring” period [c20], the agitator also switches off.
- During cooling breaks the agitator switches on periodically, in line with the set
“pause time” [c21] for the “after-stirring” period [c20], in order to ensure an even
temperature throughout the milk.
- If the milk temperature rises again, and exceeds the selected target temperature
by the hysteresis value [c10 or c11], the compressor and agitator are switched
on again automatically.
