Instruction manual 1.0.0 rev1 en
GROW
BASE
19
Current intake fan speed = 40%
With a pressure sensor
PRES
SENSE
, the speed of the intake fans is controlled by a PID
controller to always maintain the desired negative pressure in pascal (Pa).
In this case the value “negative pressure %” provides a limitation of the intake fan speed.
(upper boundary)
Example: Negative pressure in %: 5%
The intake fans will never run faster than “current exhaust fan speed” minus 5% even if the
currently measured negative pressure is above the desired negative pressure (Pa).
EC fans are turned off if they are driven below 10%.
The fan speed of AC fans can’t be decreased without limits. When a certain value is undercut the
fan would not run reliable. How low the fan speed can be reduced, is depending on the particular
AC fan.
To avoid driving the AC fan to low, a value for switch off is defined. This value can be set in
section “advanced setup” at “intake AC turnoff” and “exhaust AC turnoff”.
If at “intake/exhaust MIN/MAX” a value below this setting is entered, the message “AC intake/
exhaust OFF<##!” is displayed. In order to not turn off the corresponding fan, the value for
“intake/exhaust MIN/MAX” must be grater then the corresponding value “AC turnoff”.
If only EC fans are used, “intake AC turnoff” and “Exhaust AC turnoff” can be set to 10% to disable
the message described above.
The minimum fan speed can’t be greater than the maximum fan speed.
Examples:
•
If for “exhaust MAX” a value smaller than “exhaust MIN” is entered, “exhaust MIN” is
set to the same value as “exhaust MAX” by the controller. The message “Fan MIN
updated” is displayed.
•
If for “exhaust MIN” a value greater than “exhaust MAX” is entered, “exhaust MAX” is
set to the same value as “exhaust MIN” by the controller. The message “Fan MAX
updated” is displayed.
Set the maximum fan speed of the exhaust
fans. This fan speed will never be exceeded.
Separate values for day and night are
available.
Set the minimum airflow of the exhaust
fans. Separate values for day and night are
available.
Pleas pay attention to the explanations
regarding “AC turnoff” at the beginning of
this chapter.
Ensure that the fan is still rotating at
the set minimum fan speed and the
Set exhaust
F
day MAX
C
100
A
BC
Set exhaust
F
day MIN
C
50
A
BC
