76/160
AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
tion. Set parameter
023
= 7, the pressure is automatically set to the default values
206
= 0 and
207
= 2000 and the pressure
unit
208
= 2 (without a unit). After this, the scale can be modified according to the needs of the facility.
Define parameters of PI regulator (
161
: pressure setpoint,
162
: proportional band pressure,
163
: integral time pressure).
pressure
161
162
0
Modulanting
fan
VEL1
VEL3
pressure
161
162
0
Modulanting
fan
VEL1
VEL3
pressure: pressure detected by the pressure transmitter
161
: pressure setpoint
162
: proportional band of the pressure
Control of speed based on dehumidification (
009
=7):
Modulating fan can be regulated based on dehumidification with built-in humidity sensor (
139
=1 or 3 only for models AH-
xxxSH1) or based on remote 0..10V humidity transmitter (
139
=2 or 4).
Regulation can be done with PI regulator.
To use this function set the following parameters:
008
=4 (modulating fan);
If required on plant select output for supply fan
030
=1 or
031
=1 or
032
=1;
If required on plant select output for return fan
030
=2 or
031
=2 or
032
=2.
Set type of regulation on modulating fan
009
=7 (regulation based on dehumidifcation).
Set parameter
139
to select the type of humidity sensor used for dehumidification:
139
=1 for built-in humidity sensor -> models AH-xxxSH1
139
=2 for a remote 0..10V humidity transmitter (set
023
=6 and position jumper JP1 on position “2-3“, then input sensor AI3
is set for 0..10V input transmitter, the corresponding range is set to 0..100 %r.H. (
206
=0 and
207
=100) with unit set to %r,H.
(
208
=1).
Set regulation parameters for dehumidification (
141
: neutral zone humidity,
142
: set humidity,
143
: proportional band humidity,
144
: integral time humidity)
Speed of modulating fans is regulated between speed 1 and 3 as indicated on the figure below::
H
WDS
143
VEL3
0
Ventilatore
modulante
VEL1
142
AOx
141
/2
H
WDS
143
165
0
Val_damper
164
142
AOx
141
/2
(Fig1)
(Fig2)
H
WDS
143
VEL3
0
Modulating
fan
VEL1
142
AOx
141
/2
(Fig1 inglese)
H: value of built-in humidity sensor or remote humidity transmitter
WDS: working deumidification setpoint
142
: humidity setpoint
141
: neutral zone humidity
143
: proportional band humidity
Speeds 1 and 3 of supply fan are defined based on parameters
150
,
151
,
154
,
155
,
156
.
If return fan is also used set the following parameters to set speed 1 and 3:
152
,
153
,
154
,
155
,
156
.
The percentage output of the PI controller is applied between the speed 1 and 3.
If the dehumidification request corresponds to a value greater than speed 1, the
icon is displayed. If the request corre
-
sponds to the speed 1, the
icon is switched off
Note: If the frost protection alarm is activated (and
188
=1), the fans are immediately stopped.
If the appliance is switched off, the fans are stopped after the switch-off delay for the fans
160
has elapsed.
