MP2000 AIR CONDITIONERS

Sistema di controllo a microprocessore per condizionatori d'aria • Air conditioners microprocessor control system

running time

150 s

82,5s

37,5s

050

100%

close

open

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Fig.40

Con temperatura ambiente inferiore a 22,3°C la valvola è totalmente CHIUSA, mentre con temperatura ambiente superiore a 23,5°C la valvola è totalmente APERTA.

All’interno del campo di lavoro (da 22,3 a 23,5°C), la posizione della valvola viene determinata regolando il tempo di apertura o chiusura in base alla temperatura ambiente e al tempo impostato nel parametro "floating valve running time".

Esempio:

Se la temperatura varia da 22,3°C (richiesta di apertura = 0%) a 22,6°C (richiesta di apertura = 25%), il tempo di apertura della valvola corrisponde a:

percentuale di apertura/100xfloating valve running time cioè: 25/100x150 = 37.5 secondi, per cui viene attivato il relè di apertura per 37.5 secondi, quindi entrambi i relè vengono disattivati in modo che la valvola rimanga in posizione (aperta al 25 %).

Se la temperatura ambiente aumenta (richiesta di apertura

=55%),il tempo di apertura totale della valvola sarebbe di: 55/100x150 = 82,5 secondi; essendosi già aperta per 37,5 secondi, viene attivato il relè di apertura per 45 (82,5-37,5) secondi, quindi entrambi i relè vengono disattivati in modo che la valvola rimanga in posizione (aperta al 55 %).

Se invece la temperatura diminuisce, viene attivato il relè di chiusura per un tempo proporzionale calcolato con le stesse modalità precedenti.

In questo modo si ottiene un effetto di regolazione propor- zionale pur utilizzando un servomotore con funzionamento ON/OFF.

La stessa logica di funzionamento vale per "heating floating valve" per variazioni di temperatura inferiori al setpoint. All’accensione dell’unità, indipendentemente dalla tempe- ratura, viene attivato il relè di chiusura della "cooling e/o heating floating valve" per il tempo impostato nel parametro "floating valve running time", per garantire il posizionamento in completa chiusura della valvola, quindi inizia la regolazio- ne descritta precedentemente.

Tutto l’esempio è valido quando il parametro "cooling floating valve logic" è impostato su "normal" altrimenti , se fosse impostato su "reverse" verrebbe invertita tutta la logica di apertura/chiusura.

23,5

24 x (°C)

When room temperature is lower than 22.3°C the valve is completely CLOSED, when the room temperature exceeds 23.5°C the valve is completely OPEN.

The valve position in the work field (from 22.3 to 23.5°C) is identified by adjusting the opening or closing time, based on the room temperature and the time set in the "floating valve running time" parameter.

Example:

If the temperature ranges from 22.3°C (opening request = 0%) to 22.6°C (opening request = 25%), the valve’s open- ing time corresponds to:

opening percentage/100xfloating valve running time, i.e.: 25/100x150 = 37.5 seconds.

Accordingly, the opening relay is activated for 37.5 sec- onds, then both relays are deactivated, to allow the valve to remain in position (opened by 25%).

Should the room temperature rise (opening request = 55%), the total opening time of the valve would be 55/ 100x150 = 82.5 seconds.

Since the valve has been opened for 37.5 seconds, the opening relay is activated for 45 seconds (82.5–37.5). Then, both relays are disabled, to allow the valve to remain in position (opened by 55%).

Should the temperature fall, the closing relay is activated for a proportional time, calculated as above.

This procedure allows you to obtain a proportional regula- tion effect, also by using an ON/OFF servomotor.

The same operating logic is used with the "heating floating valve", for temperature changes below the set point. When the unit is switched on, independently of tempera- ture, the closing relay of the "cooling and/or heating floating valve" is activated for the time set in the "floating valve running time" parameter, in order to guarantee that the valve is completely closed.

Then, the regulation described above will begin.

This example is valid when the "cooling floating valve logic" parameter is set to "normal".

If it is set to "reverse", the opening/closing logic would be reversed.

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MP2000 specifications

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