CONTROL
UNIT
The FOCS and FOCS-CA units fitted with two screw compressors
feature the innovative CLIMAVENETA W3000 control unit.
The units fitted with 3 and 4 compressors use the CVM3000 control unit
instead: the new W3000 control unit will shortly be available for the
entire FOCS and FOCS-CA range.
The main characteristics and innovations of the new control unit are connected
with the following:
User
Interface.
Machine management.
Interfacing with supervision
system and BMS, FWS.
Service.
Remote keyboard.
User
interface
Located
on the outside of the electrical panel and protected by a transparent
cover, the user interface is easy to access.
Together with a graphic display for reading and writing control parameters,
the interface also comprises a mimic panel for real-time visualisation
of compressor operating status and any compressor / circuit faults.
Up to 10 chillers, joined together with suitable communication cables,
can be managed from just one keyboard (local or remote); the maximum distance
between the keyboard and the furthest unit must not exceed 200 m.

A mask offers access to five main menus:
Unit menu:
displays the temperatures of the water entering and leaving the evaporator/recuperator
(if fitted).
The main functions include the display of cooling circuit high and low
pressure values and compressor discharge temperatures; compressor and
pump (if fitted) operating hours are also displayed.
Setpoint
menu: sets the operative setpoints of the unit
I/O menu:
displays the status of the digital inputs and outputs
Clock menu:
displays the current date and time as well as the weekly/daily unit programming
User menu:
defines the methods for adjusting the unit and the limit (min. and max.)
setpoint values.
It can also enable/disable setpoint modification from an external contact/signal,
switch on and off the unit from an external contact/supervision, limit
power output (demand limit) from an external signal, etc..
Access to the user menu is password protected.
Press
the “Alarm” button to access the
Alarms menu:
identifies and resets any active alarms (e.g.: phase sequence, high/low
temp. of evaporator inlet water, low water flow rate, low water content
in system, compressor, fan or pump (if fitted) overload, etc.).
Machine
management
The standard software
of the W3000 control units comprises special control algorithms which
boost energy saving and assure maximum system reliability.
All the management activities of compressor starting / stopping times,
which are based on the management of compressor operating hours and relative
hourly rotation + FIFO logic, work towards this aim.
Fan management, performed on the basis of condensation pressure values,
is also optimised in order to boost power saving and assure silent running,
compatibly with operating conditions that do not affect the efficiency
and reliability of the system.
Chilled water temperature adjustment is based on a proportional logic
and affects the evaporator inlet temperature.
Hourly
compressor rotation + FIFO |
X |
Compressor operating hours management |
X |
Ventilation adjustment |
X |
Proportional adjustment of inlet water temperature
|
X |
Unlike CVM3000, the new W3000 control unit also manages
the available resources at the thermoregulator from an external contact
(Demand limit).
Moreover, thanks to the installation of an expansion board, the following
can be directly managed from the control unit:
- Dual setpoint from an external contact
- Setpoint regulation from an external signal (40..20 mA)
or
-
On-board pump control (optional)*
*Simultaneous
setpoint regulation and pump management requires the installation of 2
additional boards.
In particular,
as regards the on-board pump assemblies (optional), the W3000 control
unit now controls pump rotation and stand-by with a microprocessor, with
automatic starting of stand-by pump if a fault develops in the primary
pump, as well as controlling rotation according to the number of operating
hours.
The new W3000 control unit also features integrated compressor
management:
- No-load
start management.
- Control of compressor discharge temperature with control (if fitted)
of liquid injection.
The
following functions are also managed:
- Phase sequence
control.
- Remote on/off.
- Cumulative fault alarm
The FOCS and FOCS-CA units are fitted with phase
sequence relays and volt-free external contacts for remote on/off and
cumulative fault alarm reporting.
Compressor power is
adjusted by moving the relative slide valve.
Standard step adjustment is particularly suitable for plants with greater
thermal inertia.
The W3000 control unit will shortly be able to control infinite adjustment
of the compressor distribution chamber (optional):
infinite power adjustment is recommended for systems requiring elevated
adjustment precision.
If required, electronic thermostat valves can also be
controlled (optional).
A special driver connected with the W3000 control unit allows controls
these using a dedicated software application totally developed by Climaveneta.
The electronic expansion valves offer limited overheating of the refrigerant
leaving the evaporator without danger of fluctuations, thereby boosting
system efficiency and reducing the risk of reverse liquid flow.
Electronic thermostat valves are particularly advantageous in operating
conditions with low external air temperatures, where considerable savings
in power draw can be obtained.
Limitation
of resources available at the thermoregulator from an external contact
|
X |
Dual setpoint from an external contact |
OPT |
Setpoint variation from an external signal 4-20 mA
|
OPT |
Pump control |
OPT |
Second pump control |
OPT |
Phase sequence control |
X |
Remote on/off with external volt-free contact |
X |
Cumulative fault alarm |
X |
Up to 5 daily operating time bands can also be set up from the control unit;
machine on/off and different setpoints can be set for each time band according
to requirements.
Programmable
timer function |
Par |
Operation
with dual calibration point linked to programmable timer |
Par |
As regards
interfacing with supervisions systems and BMS, please consult the relative
chapter.
Future developments of the W3000 control unit will involve installing
a particular version of the software for integrating the control and management
of a system comprising more than one Climaveneta energy-raiser unit (up
to a maximum of 5).
Similarly to CVM MASTER, units of different construction types and potentials
can be joined together: this makes it possible to integrate chillers and
heaters to provide hot and cold loads at the same time or separately for
seasonal requirements. The integration of these units perfectly satisfies
the various requests for heat and/or cold and assures elevated power saving
by selecting the operating sequence of the most suitable system resources.
This context of integration clearly includes control of any pumps on the
chilled water circuit and, if required (depending on the types of integrated
machines), on the hot water circuit.

Interfacing
with supervision systems and BMS
The new W3000 control unit interfaces both with Climaveneta–De’Longhi
supervision systems and with many of the BMS systems currently available
on the market.
Similarly
to the other control units for Applied line units, the W3000 is compatible
with the innovative supervision system.
Climaveneta FWS (Field Web Server)
As regards the other main BMS systems on the market, W3000 is compatible
with:
- METASYS®
- MODBUS®
- LONWORKS®
- SIEMENS®
- TREND®
by installing the relative dedicated interface boards or an RS485 interface
board.
Local/remote
supervision through browser and FWS |
OPT |
Interfacing
with Metasys Johnson Controls |
OPT |
Interfacing
with Modbus protocol |
OPT |
Interfacing
with Bacnet protocol |
OPT |
Interfacing
with LonWorks network |
OPT |
Interfacing
with Siemens |
OPT |
Availability
of protocol specifications |
X |
Climaveneta
FWS (Field Web Server)
The FWS supervision system allows systems (from 1 to 200
units) to be monitored without having to install any additional software
to dedicated supervisor PC's. A normal browser (e.g. Internet Explorer,
Netscape, etc.), in fact, is used to communicate with the system. This
is normally already installed on the PC. If not, it can be downloaded
from the Internet free of charge.
The Web Server “FWS”, the heart of the system, is installed
between the supervisor PC and the Climaveneta units.
The FWS and PC communicate with each other
through the Ethernet (LAN). If the system is already connected via a local
network, simply install the FWS board to the network to access it from
any PC connected to the LAN. If no local network (LAN) has been installed,
there will be just a direct connection between the FWS and the PC.

The units and the FWS communicate with each other via an RS 485 local
network (a serial board must therefore be fitted on the units). The maximum
distance between the FWS and the furthest unit must not exceed 1,000 metres.
Some of the main variables involved in the management and adjustment process
of the heat raisers can be displayed with the browser of the supervisor
PC (e.g.: unit status, compressor status, operating method, operating
setpoint, main temperatures, etc.). The main parameters can also be modified
(e.g.: operating setpoint and relative proportional bands, unit operating
mode, etc.).
Daily/weekly programming can be set on each unit.
Weekly planning allows two different time bands to be managed on a daily
basis. These feature independently customisable times.
Five time bands can be set for each day of the week.
The operative setpoints can be set for each time band.
Though the setpoints can be modified from the supervisor PC, temperatures
can always be adjusted on each unit. This ensures that all the units in
the system continue to work even if the supervisor is disabled.
Alarm
events are logged for each unit by storing the date/time/code/description
of each fault and the relative reset date/time.
Access to FWS is protected, of course, and users must enter their login
and password before being able to use it. Various types of user profiles
can be created. Which parts of the system and what information can be
accessed are defined for each profile.
The supervisor user interface has been organised like a website. In the
standard version, the system information is divided into several pages
that can be dynamically accessed by means of links. The information on
each page is organised into a table.
On request, and if the complexity of the system allows, the pages may
be customised. Pictures (photos, for example) may be added and the main
system descriptions and link references can be customised. Sensitive areas
can be created next to the pictures (photos of the units, for example)
in order to link the screens giving further information about the units.
If the FWS
is connected to the Internet, the supervision software can be updated
and/or modified online. The FWS works correctly even if it is not connected
to the Internet. In this case, the software must be updated/modified from
a PC connected to the system LAN.
On
request, it is also possible to configure the Climaveneta Technical Assistance
notification function on the FWS. This function makes it possible to exploit
the full potential of the Service software via the Internet; additionally,
if one of the Climaveneta units signals an alarm, the FWS sends an e-mail
to the Climaveneta Technical Assistance service indicating which unit/system
is involved, the date and time, the alarm code and the description. The
same message can be sent to a GSM cellular phone via SMS, if required.
Equipment
not supplied by Climaveneta can be controlled through volt-free contacts.
Temperatures can also be read with NTC probes. When the electrical panels
are installed, enough terminal boards must be fitted and enough free space
left for additional boards. This feature is not included in the standard
version of the supervisor, of course, and feasibility will be assessed
on a case-by-case basis depending on the specifications provided by the
customer.
The FWS system
also interfaces with the DèLonghi Touch Screen and can therefore
interface with hydronic terminals and any additional DeLonghi chillers
belonging, for example, to complete DeLonghi Relax® hydronic systems.

Service
The W3000
control unit software includes the Alarms Log and Black Box functions
as standard features.
With the introduction of the W3000 control unit, we can proudly talk about
a “second generation” of black boxes.
This new box
can log data relative to up to 200 variables, acquired every 30 seconds
in the 10 minutes before an event; all the above can be repeated for up
to 400 separate events.
This amply exceeds the possibilities of the previous version which was
limited to a decidedly lower number of acquirable events (7) and variables
(20).
The software
is also compatible with the Service programme: thanks to the remote Internet
connection, the Climaveneta Service can remotely monitor the unit, take
preventive and corrective action and thus offer the final customer a more
effective and higher quality service. In the event of a fault, it is also
possible to send an e-mail to the technical assistance centre indicating
which unit/system is involved, the date and time, the alarm code and the
description. The same message can also be sent to a GSM cellular phone
via SMS, if required.
Alarm
log function |
X |
"Black-Box"
function for alarm events |
X |
Number
of alarm events that can be memorised |
200 |
Number
of alarm events that can be memorised and printed with a PC |
200 |


Remote
keyboard
The units
with the W3000 control unit can be fitted with a remote keyboard which
can be used to perform all the display and setting activities performed
on the main display (except for alarm resets).
Climaveneta
S.p.A
|