Robur Direct Digital Controller, Инструкция по установке, использованию и программированию

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Direct Digital Controller
62
Direct Digital Controller fw 4.013 – Ed. 01/2013
Minimum switch-on time of a category
This further parameter is present for every category. This allows to define the minimum switch-on time of
every stage of the category and has the purpose of preventing that the machines are kept on for a period that
is too brief, with negative impact on the yield of the same. In practice, when a stage is switched on, it can be
switched off only after the
“minimum switch-on time” has passed, whatever the rules of the regulation
algorithm described in the relative paragraph; for example, referring to Figure 16, if the time passing between
points 2 and 4 is less than the
“minimum switch on time” , the first stage would not be switched off in point 4,
but later, after the “minimum switch on time” calculated from point 2. It is clear that the use of too high a
value of this parameter can lead to poor regulation, as the respect for the minimum switch on time will cause
frequent and consistent breaches in the rules of the normal algorithm; on the other hand, too low a value will
lead to the machine being switched on for very short periods, which will compromise yield.
Default values of the parameters and indications for correct choice of their values (categories 1 and 3)
Default values
Parameter Value of Categ. 1 Value of Categ. 3 Recommended setting
Machine power 35 kW 35 kW Not modifiable
Priority 6 4 Not modifiable
Prevention time 5 minutes 2 minutes Use default values
Mi. switch-on time 7 minutes 3 minutes Use default values
Number of stages 10 10
Use the maximum value
possible for the number of
machines present
Enable integral
6 °C * minutes
(10,8 °F * minutes)
6 °C * minutes
(10,8 °F * minutes)
Disable integral
8 °C * minutes
(14,4 °F * minutes)
8 °C * minutes
(14,4 °F * minutes)
Use the semi automatic
configuration (refer to paragraph
4.4.2.6.4 “Regulation
parameters” on page 96), which
calculates the value of these
parameters according to the
other data set for all categories;
the calculation is made when
exiting the configuration panel
Table 1 – REGULATION PARAMETER DEFAULT VALUESHEATING OPERATION (categories 1 and 3)