EVCO S.p.A.
EV3 MVC & EVD MVC | Application manual ver. 1.0 | Code 144EV3MVI104
page 45 of 72
9 REGULATIONS
9.1 Regulation in the incremental neutral zone
The working parameters for regulation in the neutral zone consist of a setpoint, a regulation band, a reaction time and an incremental
step. Almost all the available functions use these regulating mechanisms.
Because this system is extremely easy and intuitive to operate it provides excellent results, allowing precise regulation.
The neutral zone is between the setpoint:
1) When the regulation variable is in the neutral zone, it is regulated according to the controlled output value, maintaining the
same value
2a) When the regulation variable falls below the neutral zone, the regulation immediately increases the controlled output value by
a percentage equal to the value expressed by the relevant parameter (incremental/decremental step)
2b) If the regulation variable is not within the neutral zone by the time set by the relevant parameter (reaction time) point 2a
above is repeated until the maximum possible value of the output value is reached
3a) When the regulation variable rises above the neutral zone, the regulation immediately decreases the controlled output value
by a percentage equal to the value expressed by the relevant parameter (incremental/decremental step)
3b) If the regulation variable is not within the neutral zone by the time set by the relevant parameter (reaction time) point 3a
above is repeated until the minimum possible value of the output value is reached
The diagram below is a graphic representation of the operating mode.
9.2 Selecting the operating modes
The controller always makes it possible to manage heating and cooling and use either manual operation or timer settings to meet the
user’s needs in the best way.
Selecting hot/cold mode
There are three season change modes in descending order of priority:
- By digital input
- By probe (automatic)
- By keypad/supervisor.
If a digital input is configured as season change the status of this input determines the operating mode.
If a digital input is not configured but the automatic change-over function (C11=2) is activated, the machine heats up if the probe
temperature configured by parameter C23 is lower than C25, while it cools down if the regulation temperature is above C26.
Parameter C24 sets the time necessary for the mode to change.
If the changer-over probe (C23) is not configured by the relative parameters (I01-I20) the configuration alarm is activated, if however,
the probe is in alarm mode the relative probe alarm is activated. In both cases this inhibits the automatic season change and the
machine stays in “current” operating mode.
If a specific digital input is not configured and the automatic change-over function (C11=0) is not activated, the operating mode is set
by the keypad and each time the ESC key is pressed this will change the operating mode...-> COOL -> HEAT.
In this situation the supervisor is able to force the operating mode (Status S16).
If C11=1 (Manual + Auto) is set by the keypad and supervisor, it is possible to decide whether machine is to operate in hot, cold or
automatic mode, in which case every time the ESC key is pressed the operating mode will be changed ...-> COOL -> HEAT → AUTO.
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