Variable Airflow Operation (Vav) - S&P SLIM Series Manual

Follow this sequence to check the sensors settings:
Occasionally, depending on the characteristics of the ductwork and the regulating elements, it may be necessary
to modify the Proportional and Integral Bands of the fan speed control output. To modify the Proportional and
Integral Bands, follow the next sequence:
Regulation problem Behaviour
It is not possible to maintain an stable airflow owing to the fans speeds being pumping
Unstable regulation
and dumping constantly
Airflow set point is not achieved. While the fans do not reach their maximum speed, the
Slow regulation
increase in its speed is low.
19.1.2. Variable airflow operation (VAV)
Mode recommended for variable airflow applications depending on an analogue signal (0-10V).
The set point value depends on an external 0-10V signal (sensor, BMS, etc.) connected as shown in section "14.4.3. VAV
wiring diagram".
The access to the simplified parameter setting menu allows to set:
• The selection of the useful range of the signal 0-10V (see example below).
• The range of the supply and extract airflow.
44
Settings
Increase P-Band
Reduce I -time
Reduce P -Band
Increase I -time