Page 9 of 15
7. THE REGULATOR’S WORK CYCLE.
When the regulator is connected to the mains and its operation is switched on with the button [1],
the regulator goes – after the delay set in parameter dE – to the control phase.
The regulator controls two control circuits:
a) control circuit for the refrigeration / heating unit;
b) control circuit for the stirrer’s motoreducer.
The work for the control settings of the refrigeration system will be discussed below.
ATTENTION
Parameter dE is the delay of switching on the chiller (unit) and the stirrer after switching on the
regulator's work or after the supply voltage decay – default value is set to 5 sec.
7.1. Control of the refrigeration unit.
The temperature control value (within the range specified in parameters b1 and b2) is set by pressing
the buttons marked with the symbols ▲ and ▼, while short pressing any of these buttons displays
the currently set value, while only the next pressing causes the change of this value. Transition from
reading the measured temperature to the reading of the set control temperature is signaled by the
digits / numbers flashing.
The chiller (unit) control in the cooling phase takes place depending on the temperature present
in the refrigeration chamber. The regulator can control the cooling temperature in the range
of -40
O
C up to +120
O
C. In order to limit the scope of the control so as to prevent the user of the
cooling device from setting the temperature outside this range, set the proper parameters: b1
(limitation of the lower control temperature range) and b2 (limitation of the upper control
temperature range).
ATTENTION
Temperatures specified in parameters b1 and b2 do not indicate control points for switching off
and switching on the operation of the unit.
Setting b1=b2 blocks the possibility of changing the programmed temperature by means of the
▲ and ▼ buttons. It is not allowed to set b1 > b2.
The change in the value of b1 or b2 can be blocked by the currently set control temperature.
In the event of such a situation, change the control temperature settings and then change
parameters b1 and / or b2.
It is also important to set the control hysteresis correctly – parameter HI. The control hysteresis is
a parameter that determines the temperature difference at which the switching off occurs and then
the unit is switched on. For example, if the control temperature is set to + 4
O
C and hysteresis to
2
O
C, then the unit will be switched off after reaching 4
O
C, while its re-activation will occur after
the temperature has risen to 4+2 = 6
O
C.
The regulator allows to set the hysteresis of the control in the range of 0.2
O
C to 10
O
C, every 0.2
O
C.
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