INSPY. 1003. 4138305_03
12
4.6. ELECTRONIC REGULATION
Electronic regulation on the NS chillers
consists of control cards for each compres-
sor connected to each other in a network
and a control panel with display, see figure.
In the case of models with more than one
compressor, the card that controls com-
pressor 1 is the “MASTER” card, while the
others are “SLAVE”. On each card, trans-
ducers, loads and alarms are connected
to the compressor that commands while
the general machine ones are connected
only on the master card. The program and
parameter pre-set are stored permanently
in the controller’s FLASH memory, to ensure
that they are kept in memory even when
the system is not powered (without the
need for an auxiliary battery).
The connection to the serial supervision as-
sistance line in accordance with the RS485
standard, is performed through the serial
card ACCESSORY RS485P1 and the com-
munication protocol.
• The terminal, which is always controlled by
microprocessor, is equipped with a display,
a keypad and a set of LEDs, and is used
for programming control parameters (Set
Points, differential band, alarm threshold)
and for fundamental user operations (ON/
OFF, display controlled values).
The terminal does not need to be con-
nected to the pCO for normal controller op-
eration, and is necessary only when initially
programming the basic parameters.
Microprocessor
−
Remote on/off with external contact
without power
− Multi-lingual menu
− Phase sequence control
− Independent control of individual
compressors
− Ammetric transformer
− Cumulative failure block signalling
− Alarm log function
− Daily/weekly programming
− Inlet/outlet water temperature display
− Alarm display
− Full proportional regulation of the out-
put water temperature
− Programmable timer function
− Function with double setting point con-
nected to an external contact
− Fan regulation
− Interfaceability with the Modbus proto-
col (accessory)
− Pump/s control
− Compressor rotation control
− Analogue input from 4 to 20 mA
− Outside air temperature sensor
− Function "Always Woking" In the case
of critical conditions (e.g. ambient tem-
perature that is too high) the machine
does not stop but is able to regulate
itself and provide the maximum power
that can be generated in those condi-
tions.
− Self adapting operating differential
“Switching Histeresys” to ensure the cor-
rect compressor functioning at all times
even in plants with a low water content
or insufficient flow rates. This system
reduces the compressor wear
− The AFFP “Anti Freezing Fan Protection”
system that turns on the fans periodi-
cally when the external temperatures
are very low
− The PDC “Pull Down Control” system
to prevent the activation of the power
steps when the water temperature is
approaching the set point quickly. It
optimises the operation of the machine
both when running normally or when
there are load variations, thereby
assuring top machine efficiency in all
situations.
For further information, refer to the user
manual.
pCO
3
MASTER
pCO
3
SLAVE
pCO
3
SLAVE
SINGLE
Compressor
BI
Compressor
TRI
COMPRESSOR
Terminal on the machine
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