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3. REGULATION PRINCIPLES
The range of humidifiers includes the following regulation possibilities.
3.1 ON/OFF regulation
The action in this case is all or nothing, activated by an external contact which thus determines the Set Point and the
regulation differential (or hysteresis).
Average steam production can be adjusted using a pseudo-modulating action, through the cyclical activation of the remote-
control switch with a fractional actuation period (operation) that can be programmed in four steps: 30%, 50%, 75% or 100% of
the total time (this mode can not be applied in severe operating conditions and without consequences on the noise level, caused
by the frequent activation of the remote-control switch).
3.2 Modulating regulation
The appliance is fitted with solid-state relays and thus steam production can be regulated continuously as a function of the
required quantity, in one of the following modes.
3.2.1 ON/OFF regulation
As for the type C control module (see ON/OFF regulation (type C control module)).
Slave regulation, with signal emitted from an external regulator
Steam production is proportional to the value of an
external signal Y, (selected by programming one of the
following standards: 0 1Vdc; 0 10Vdc; 2 10Vdc;
0 20mA; 4 20mA) the entire range of which is indicated
by BP (proportional band).
The maximum production P
maximum value of the external signal Y, can be
programmed between 10
value of the humidifier.
The minimum production P
nominal value, with an activation hysteresis provided by
the value hy, equal to 2% of the entire range BP of the
external signal Y.
If enabled, the pre-heating function overlaps the
regulation diagram, and is activated when the external
signal Y is lower than the activation point for steam
production by a quantity b2.
3.2.2 Autonomous regulation with relative humidity transducer
Steam production is linked to the measurement of % rH,
performed by the relative humidity transducer connected
to the regulator, and increases as the distance from the Set
Point St increases.
The maximum production P0, which occurs when the relative
humidity is less that the Set Point by a value P1, can be
programmed between 10% and 100% of the nominal
value of the humidifier.
The minimum production Pmin is fixed at 10% of the
nominal value, with an activation hysteresis provided by
the value hy, equal to 10% of P1.
The pre-heating function, if enabled, overlaps the regulation
diagram and is activated when the relative humidity % rH,
measured by the
programmable quantity b2.
The dehumidification function, if enabled, overlaps the regulation diagram and is
activated when the relative humidity % rH, transmitted by the transducer, is
higher than St by a programmable quantity P5+P6; the hysteresis of the step, also
programmable, is equal to P6.
Carel code +030221761
(control module C)
(control module H)
(parameter A0=0)
, corresponding to the
max
and 100
of the nominal
%
%
is fixed at 10% of the
min
transducer, is higher than St by a
(parameter A0=1)
steam production
Pmax
hy
P
min
OFF
ON
b2
0 Vdc
0 Vdc
2 Vdc
0 mA
OFF
ON
4 mA
hy
hy
(parameter A0=2)
steam production
P0
Pmin
STEAM
PRODUCTION
P1
active
PRE-HEATING
inactivate
7
preliminary version - rel. 2.0 - 03/09/99
PRODUZIONE
DI VAPORE
active
PRE-HEATING
inactivate
BP
Fig. 3.2.2.1
hy
% rH
ON
OFF
St
b2
ON
OFF
ON
hy
P6
P5
active
OFF
DEHUMIDIFIER
inactivate
Fig. 3.2.3.1
heaterSteam
Y
1 Vdc
10 Vdc
10 Vdc
20 mA
20 mA
ON
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