73/160
AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
Control of speed based on temperature ON/OFF (
009
=3):
Control of the fans is carried out based on the temperature of the control sensor, the operating setpoint and the proportional
band of the fan defined by the parameter
157
. When the temperature reaches the operating setpoint, the fan is switched off
after the switch-off delay for the fan
160
has elapsed.
Depending on the type of fan, they will work according to the following chart:
- Summer control:
Treg
WCS
OFF
Fan 1
on/off speed
Treg
WCS
157
0
Modulating
fan
ON
Treg
WCS
OFF
Fan 2
on/off speed
FAN1
FAN2
Treg
WCS
OFF
Fan 3
on/off speed
FAN1
FAN3
FAN2
FAN1
FAN3
157
157
157
158
Treg: temperature of the control sensor
WCS: cooling operation setpoint
157
: proportional band of the fan
158
: step enabling for supply fan
VEL1: speed 1= [(
154
/ 100) x (
151
-
150
)] +
150
for the supply and =[(
154
/ 100) x (
153
-
152
)] +
152
for the extraction.
VEL2: speed 2= [(
155
/ 100) x (
151
-
150
)] +
150
for the supply and =[(
155
/ 100) x (
153
-
152
)] +
152
for the extraction.
VEL3: speed 3= [(
156
/ 100) x (
151
-
150
)] +
150
for the supply and =[(
156
/ 100) x (
153
-
152
)] +
152
for the extraction.
For the two-speed fan:
if Treg < WCS, the fan is off
if Treg increases and Treg > (WCS + (
157
/2)) and Treg < (WCS +
157
), speed 1 is ON,
If Treg > (WCS +
157
), speed 2 is ON,
if Treg decreases and Treg <= (WCS + (
157
/2)) and Treg > WCS, speed 1 is ON,
if Treg < WCS, the fan is off
For the three-speed fan:
if Treg < WCS, the fan is off,
if Treg increases and Treg > (WCS + (
157
*(1/3))) and Treg < (WCS + (
157
*(2/3))), speed 1 is ON,
