Introduction To Danfoss Vlt Series And Devicenet; Product Overview; Product And Environment; Overall Function - Danfoss VLT 5000 Operating Instructions Manual

Product Overview

Product and Environment

The DeviceNet Option Card is an interface between
the DeviceNet serial communication bus and the VLT
frequency converter from Danfoss. The option card
will function as an integrated part of the drive.
DeviceNet is a distributed control network. The
DeviceNet protocol is embedded in the controller option
card and is a communication protocol conforming to the
Open DeviceNet Vendor Association (ODVA) standard.
The option card allows DeviceNet compatible
controllers, sensors, and network management tools
to control, monitor, and supervise the VLT frequency
converter. The option is designed to the DeviceNet
System Protocol for Vendors as a slave device.

Overall Function

A DeviceNet compatible device has the ability to
perform the following operations with the VLT frequency
converter over the DeviceNet network:
1. Control speed references and send drive
control commands.
2. Monitor the status of the drive, access alarm
and warning messages, and monitor drive
and motor information.
3. Upload and download drive settings, configure
drives, and also perform the operations
defined in 1 and 2.
Therefore, the level of control and flexibility of the VLT
frequency converter over the network depends on
the capabilities built into the controlling device.
The application program has the following functions:
1. Support interger parameters through the
dual ported RAM.
2. Manipulate the dual ported RAM parameters
to interface with the CAN.
3. Monitor network activity "watchdog" function to
determine Master – Slave communication continuity.
2
®
VLT 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA DeviceNet

Network

The VLT frequency converter will function as a slave
on the DeviceNet network. All addressing and linking
to nodes is done at installation time by a network
manager tool. The network installer and the network
management master have a significant influence on
how the node functions on the network. A DeviceNet
network can support up to 64 nodes.

User Profile

The end-user is a network manager programmer or
a controller who see the DeviceNet control card as
a transparent bridge to the VLT frequency converter.
Control and supervision of the VLT frequency converter
will still be possible through the standard parameter set.

Data Communication Interface

No direct data communication interface (e.g. via a
serial port) other than the DeviceNet interface and the
VLT frequency converter interface is considered.

Initialization of VLT frequency converter Interface

The VLT frequency converter interface is initialized in
three phases. The first two phases are initiated and
controlled by the VLT which will write commands to
the option card through the dual port RAM.
Phase 1:
Is the initialization of the communication system.
During this phase the option card must respond
correctly to the VLT frequency converter initialization
command or else the VLT will not function and
display a "No Option Init" message.
MG.50.H4.02 - VLT is a registered Danfoss trademark