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To check that the relative humidity measured by the transducer is within the pre-
set values, the control module with autonomous regulation allows two alarm
thresholds to be programmed:
high relative humidity alarm threshold P2;
low relative humidity alarm threshold P3.
When these thresholds are exceeded, after a programmable delay P4, an alarm
state is activated, with the closing of the contact of the corresponding relay on
the main control board.
With autonomous regulation (parameter A0=2) it is also possible to have an ON/OFF action, as represented in the graph, by
disabling power modulation (setting parameter b0=0).
The pre-heating and/or dehumidification, if enabled, remain unchanged.
3.2.3 Autonomous regulation with ambient relative humidity transducer and supply humidity
limiting transducer
In this case too the regulator modulates steam production as a function
of the measurement % rH performed by the main relative humidity
transducer, however, in addition, its entity is limited if the relative
humidity % rH2 measured by a second compensation transducer
placed in the humidifier air inlet duct exceeds the maximum desired
value.
This limiting occurs by giving the command to decrease steam
production proportionally to the difference between the measurement %
rH2 of the supply relative humidity and the programmable threshold
P7.
The compensation probe has its own Set Point P7 and differential P8,
based on which the limit of production is calculated. If the production
required by the main transducer is greater than the limit, production
will be equal to the limit itself.
To prevent the relative humidity measured by the transducer in the
humidifier air inlet duct exceeding a value considered as excessive, the
control module with autonomous regulation and second transducer
connected allows a high supply relative humidity alarm threshold P9, to
be programmed. If this threshold is exceeded, after a programmable delay P4, an alarm state is activated, with closing of the
contact of the corresponding relay on the main control board.
3.2.4 Application for steam baths
In applications for steam baths, where the regulation probe measures temperature rather than humidity, the same
considerations are valid as for the type H control module with modulating action and autonomous regulation.
Recommended transducer: SSTOOB/P40 or ASET030001.
3.3 Setting the alarm thresholds
The control module panel allows the setting of limit thresholds for the activation of the alarm in the event where these are
exceeded.
These alarm thresholds can be programmed using the following regulation parameters:
P2: high relative humidity alarm threshold, measured by the ambient probe;
P3: low relative humidity alarm threshold, measured by the ambient probe;
P4: alarm signalling delay (to prevent false signals);
P9: high relative humidity alarm threshold, measured by the supply probe (for ducted humidification).
The parameters P2, P3, P4 are programmable only when A0=2 or 3; the parameter P9 is programmable only when
A0=3.
Furthermore, the control module allows the signalling of excessive conductivity (and thus salt concentration) of the supply
water, but only as a default setting.
WARNING: the parameter A0 and the functional alarm parameters Px and b0 are set in the factory (default values valid for
normal applications). Nonetheless, these can be modified by the user, following the instructions contained in: Reading and
programming the parameters for the type H or T control module.
Carel code +030221761
(parameter A0=3)
(type T control module)
(type H or T control module)
P n o m
L im it
O f pr od u c tio n %
P 0
1 0
8
preliminary version - rel. 2.0 - 03/09/99
heaterSteam
S te a m p ro d u c tio n
S T E A M
O N
O F F
P R O D U C T I O N
% r H
S t
P 1
Fig. 3.2.3.2
1 0% P 8
S up p ly
P 7
P 8
p ro b e
(% rH 2 )
Fig. 3.2.4.1
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Troubleshooting
