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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
For the three-speed fan:
if Treg > WHS, the fan is off,
if Treg decreases and Treg < (WHS - (
157
*(1/3))) and Treg > (WHS - (
157
*(2/3))), speed 1 is ON,
if Treg decreases and Treg < (WHS - (
157
*(2/3))) and Treg > (WHS -
157
), speed 2 is ON,
If Treg < (WHS -
157
) speed 3 is ON,
if Treg increases and Treg > (WHS - (
157
*(2/3))) and Treg < (WHS - (
157
*(1/3))), speed 2 is ON,
if Treg increases and Treg > (WHS - (
157
*(1/3))) and Treg < WHS, speed 1 is ON,
if Treg > WHS, the fan is off
For the modulating fan:
if Treg < WHS, the fan is off,
If Treg < (WHS -
158
), the speed starts at a speed between 1 and 3.
The speed is modulated up to speed 3 if Treg continues to decrease.
If Treg increases and Treg > WHS, the fan is off.
If a modulating electrical resistance is activated, the speed of the modulating fan follows the chart indicated above as long as
the required heating power is lower than the parameter
211
.
When the required heating power exceeds the parameter
211
, the speed of the modulating fan is adjusted based on the power
applied to the electrical resistance.
For example: if the parameter
211
= 80%, as long as the modulating fan speed is less than 80% of its control band defined by
the parameter
157
, the speed corresponds to the chart shown above. If the modulating fan speed is upper than 80% the speed
of the fan will have a percentage value equal to the percentage value of power applied to the electrical resistance.
In case of an on/off fan, if the heating power required exceeds the parameter
211
, the speed of the fan switches to maximum
speed.
Control of speed based on temperature and CO
2
(
009
=4):
The fan is controlled considering the maximum value between the theoretical control speed based on the temperature only
(see the paragraph “
“Control of speed based on temperature (009=2):” page 71
”) and the theoretical control speed based
on the CO
2
only (see the paragraph “
“Control of speed based on CO
2
(009=1):” page 70
”).
Control of speed based on pressure with direct action (
009
=5):
This type of control only applies to modulating fans.
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
=5 (regulation based on pressure with direct action).
A pressure transmitter 0..10 V must be connected to the input AI3 (
023
= 7) and the JP1 jumper must be put in the “3-2” posi
-
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 pressure with reverse action (
009
=6):
This type of control only applies to modulating fans.
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
=6 (regulation based on pressure with reverse action).
A pressure transmitter 0..10 V must be connected to the input AI3 (
023
= 7) and the JP1 jumper must be put in the “3-2” posi
-
