Stulz Air Booster 2, Operating Instructions Manual

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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”.