VLT
®
6000 HVAC
5MD.60.A2.02 - VLT is a registered Danfoss trademark
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■ Fieldbus protocols
Danfoss VLT frequency converters are able to fulfil
many different functions in an automated building
management system. The VLT frequency converter
can be integrated directly in an overall monitoring
system.
This means that detailed process data can be
transmitted via serial communication. The protocols
listed below are based on a RS 485 bus system
with a maximum transmission speed of 9600 bauds.
As standard, the following protocols are supported:
- Danfoss FC protocol
- Johnson's Control Metasys N2
- Landis & Staefa FLN
A frequency converter can be set and applied in all
building management control systems.
Status messages, warnings and alarms provide
valuable assistance in visualising and assessing
processes.
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■ Fieldbus options
The increasing need for information in building
management systems makes it necessary to collect
or visualise many different types of process data.
Important process data can help the system
technician in the day-by-day monitoring of the
system, which means that a negative development
- e.g. an increase in energy consumption - can be
rectified in time.
The substantial amount of data in large buildings
may generate a need for a higher transmission
speed than 9600 baud. Danfoss VLT 6000 HVAC is
available with LonWorks
®
or Profibus
®
, both of which
have higher performance than standard integrated
serial communication.
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■ Profibus
Profibus is a fieldbus system with FMS and DP,
which can be used for linking automation units,
such as sensors and actuators, to the controls by
means of a two-conductor cable.
Profibus
FMSFMS
FMSFMS
FMS is used if major communication tasks
are to be solved at cell and system level by means
of large volumes of data.
Profibus
DPDP
DPDP
DP is an extremely fast communication
protocol, made specially for communication
between the automation system and various units.
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■ LON - Local Operating Network
LonWorks is an intelligent fieldbus system which
improves the possibility of decentralising control, as
communication is enabled between individual units
in the same system (Peer-to-Peer).
This means that there is no need for a big main
station for handling all the signals of the system
(Master-Slave). Signals are sent direct to the unit
that needs them via a common network medium.
This makes communication much more flexible and
the central building state control and monitoring
system can be changed into a dedicated building
state monitoring system whose task is to ensure
that everything is running as planned. If the potential
of LonWorks is fully utilised, sensors will also be
connected to the bus, which means that a sensor
signal can quickly be moved to another controller. If
room dividers are mobile, this is a particularly useful
feature.
Two feedback signals can be linked to the VLT 6000
HVAC by means of LonWorks, thereby enabling the
internal PID regulator to regulate directly on the bus
feedback.
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