Stulz Air Booster 2 - Temperature Control Functionality; System States and Start-up;Shutdown Delays

22
AIR BOOSTER 2
EN/10.2018/IT30I © STULZ SpA – all rights reserved
5.3.1. Temperature control
The parameters involved for temperature control are: SPt, LS, US.
After the selection of temperature control, select the type of application via parameter CMt.
• CMt = BAF: Air Booster Fan → Fan Mode
Fan Mode
The parameters involved for fan mode of temperature control are: SPt, tIP, HY, int, HL, LAF, UAF.
• The control must command an electronic fan.
• The associated digital output will be K1 and it will be enabled when the controller is set to ON,
after the delay upon start-up (ton).
• The associated analogue output will be equivalent on both outputs AO1 and AO2 and will be
enabled after the delay upon start-up (ton).
• The control signal depends on the setting of temperature calculation parameter (tIP).
Proportional adjustment
SWITCHON:
• The analogue output will be 0 if: tIP ≤ SPt - HL + 1
• The analogue output will be at the minimum speed value (LAF) with: SPt - HL + 1≤ tIP ≤ SPt
• The analogue output will be at the maximum speed value (UAF) with: tIP ≥ SPt + HY
• The intermediate values will be calculated based on the two extreme values reported above
SWITCHOFF:
• The analogue output will be 0 if: tIP ≤ SPt - HL
• The analogue output will be at the minimum speed value (LAF) with: SPt - HL ≤ tIP ≤ SPt
• The analogue output will be at the maximum speed value (UAF) with: tIP ≥ SPt + HY
INFORMATION
If HL=0 (temperature switch-off hysteresis equal to zero), activation and deactivation on
temperature setpoint (SPt) occurs; the minimum value for the required operation to be
attributed to parameter HL is 0,5 °C.
Adjustment PI
The analogue output will modulate between minimum (LAF) and maximum (UAF) speed value, in order
to reset the error between temperature calculation (tIP) and temperature setpoint (SPt), considering
the temperature proportional band (HY) as a proportional component and integral time for temperature
adjustment (int) for the calculation of the integral part. With an integral type of adjustment, the steady-
state system can always reach the setpoint if the load conditions are constant.
5.4. System states
The parameters involved are: ton, toF, OPC.
Switch-on adjustment delay
Upon switch-on, in “System ON” state, the controller will wait for the delay upon start-up time (ton)
before starting to regulate. This not only applies to the switch-on, but also when switching from
“System OFF” to “System Stand By” or to “System ON”.