DIN NANO FSC
Chapter 5
– Data Programming
USER AND MAINTENANCE MANUAL
Rev. 03-18
Page 18
OPERATING MODE
The condenser fans are controlled via a 0-10V analogue output and sideband-type adjustment.
The LED icon (11) turns on to identify the fan condenser control.
The regulation probe (terminal 23 /24) can be of two types:
-
Flow pressure probe 4-20mA (parameter Pt = 0).
-
Condensing temperature probe NTC 10K
Ω (parameter Pt = 1).
The setting of parameter Pt according to the type of probe connected must be combined with the correct
setting of the jumpers on the NDINFSC board (see connection diagram). Changing the Pt involves loading
the relevant default paramet
ers on the variables marked with an asterisk in the “default Pt” column and
changing the unit of measure of some parameters (Bar if the probe connected is a pressure probe, °C if the
probe connected is a temperature probe). There are various fan control modes available.
CONTROL IN THE EVENT OF ALARMS
With the presence of ‘fans alarm’, the analog output is immediately brought to 0V and then open the digital
output 1 (inverter off). In addition, the display shows alarm (Ev).
NORMAL MODE (mOd = 0)
The adjustment follows the operation of graph nr.1 with the increase of the output pressure/condensing
temperature and the decrease of graph nr.2. For simplicity, we define the value of the probe pressure /
temperature as adjustment probe.
Adjustment probe value INCREASE
(Graph nr.1):
The analogue output of the adjuster will be
0V for output pressure probe less or equal to
point (B) representing the "SET point + iOv
offset" value.
If the adjustment probe value is higher than
point (B), you will have the analogue output
at (iHv) for the maximum BOv time. BOv is
the Fans Boost times for which the adjuster
output is increased by 100% in order to help
the start-up of the fans.
Between points (B) and (C), the analogue
output will have a value proportional to the
value of the adjustment probe starting from
the minimum value of the parameter (iLv) up
to the maximum value of the parameter (iHv).
With adjustment probe value equal or higher
than point (C), you will have a (iHv) analogue
output.
Digital output nr.1 represents "the condenser
fans inverter activation" and is ON for
adjustment probe value higher than or equal
to the set point and OFF for lower values.
5.12
Graph. nr.1
5.12.1
