Danfoss FCM 300 PROFIBUS, VLT 2800 PROFIBUS User Manual

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

■ Introduction ..............................................................3

■ Quick Setup..............................................................4

■ The PROFIBUS interface .......................................... 5

FCM 300FCM 300

■

FCM 300 - Physical connection ...............................7

FCM 300FCM 300

VLVL

T 2800T 2800

■

VL

T 2800 - Physical connection ............................. 10

VLVL

T 2800T 2800

■ System layout......................................................... 13

■ Timing ....................................................................15

■ DP (Distributed Periphery)....................................... 16

■ Parameters............................................................. 30

■ Warning and alarm messages ................................ 35

■ Glossary and parameter list.................................... 36

Contents

■ Index ...................................................................... 39

Copyrights, Limitation of Liability and Revision Rights.

This publication contains information proprietary to Danfoss A/S. By accepting and using this manual the user
agrees that the information contained herein will be used solely for operating equipment of Danfoss A/S or
equipment from other vendors provided that such equipment is intended for communication with Danfoss
equipment over a PROFIBUS serial communication link. This publication is protected under the Copyright laws of
Denmark and most other countries.

Danfoss A/S does not warrant that a software program produced according to the guidelines provided in this
manual will function properly in every physical, hardware or software environment.

Although Danfoss A/S has tested and reviewed the documentation within this manual, Danfoss A/S makes no
warranty or representation, either express or implied, with respect to this documentation, including its quality,
performance, or fitness for a particular purpose.

In no event shall Danfoss A/S be liable for direct, indirect, special, incidental, or consequential damages arising
out of the use, or the inability to use information contained in this manual, even if advised of the possibility of such
damages. In particular, Danfoss A/S is not responsible for any costs including but not limited to those incurred as
a result of lost profits or revenue, loss or damage of equipment, loss of computer programs, loss of data, the
costs to substitute these, or any claims by third parties.

Danfoss A/S reserves the right to revise this publication at any time and to make changes in its contents without
prior notice or any obligation to notify previous users of such revisions or changes.

MG.90.A2.02 – VL T is a registered Danfoss trademark

1

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

When reading through this manual, you will come
across various symbols that require special attention.

The symbols used are the following:

Indicates a general warning.

Indicates something to be noted by
the reader.

Indicates a high-voltage warning.

PROFIBUS is a registered trademark.

2

MG.90.A2.02 – VL T is a registered Danfoss trademark

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

■ About this manual

This manual is intended to be used both as an
instructional and as a reference manual. It only briefly
touches on the basics of the PROFIBUS protocol
whenever it is necessary for gaining an understanding
of the PROFIDRIVE implementation of the PROFIBUS
Profile for Variable Speed Drives (VDI/VDE 3689) and
the DANFOSS PROFIBUS for the FC motor and the
VLT 2800.

The manual is also intended to serve as a guideline
when you specify and optimize your communication
system.

If you are not completely familiar with PROFIBUS or
the Profile for Variable Speed Drives, it may be
advisable to read some of the material provided on
these subjects, eg DIN 19245 parts 1 and 3 and VDI/
VDE 3689.

Even if you are an experienced PROFIBUS
programmer, we suggest that you read this manual in
its entirety before you start programming, since
important information can be found in all chapters.

Introduction

■ Assumptions

This manual assumes that you are using a DANFOSS
FCM 300 and VLT 2800 with PROFIBUS. It is also
assumed that you, as a master, are using a PLC or
PC that is equipped with a serial communication card
supporting all the PROFIBUS communication services
required by your application, and that all
requirements stipulated in the PROFIBUS standard as
well as those set up in the PROFIBUS Variable Speed
Drives Profile and its company-specific
implementation PROFIDRIVE, as well as those
pertaining to the VLT Variable Speed Drive are strictly
observed as well as all limitations therein fully
respected.

■ What you should already know

The DANFOSS PROFIBUS is designed to
communicate with any master abiding by the
PROFIBUS DP standard. It is therefore assumed that
you have full knowledge of the PC or PLC you intend
to use as a master in your system. Any questions
pertaining to hardware or software produced by any
other manufacturer is beyond the scope of this
manual and is of no concern to DANFOSS.

If you have questions about how to set up master ­master communication or communication to a non­Danfoss slave, the appropriate manuals should be
consulted.

MG.90.A2.02 – VL T is a registered Danfoss trademark

3

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

Programming: See the design guide:

FC motor (MG.03.Bx.02)

VLT 2800 (MG.28.Ex.02)
for descriptions on how to programme the ordinary
FC motor and VLT 2800.

Quick Setup

■ General information

Parameter 918:
Set the station address, - one unique address per
unit.

In parameters 502-508 it is possible to define how to
gate the control commands from the PROFIBUS with
the equivalent control commands of the digital inputs.

The FC motor/VLT 2800 adjusts to the baudrate and
the configuration from the master.

Communication is established by setting the
parameters stated below.
Setting up the master: See the manual on the master
as well as the chapters of this manual giving details
on the PROFIBUS interface for information on how to
set up the master.

4

MG.90.A2.02 – VL T is a registered Danfoss trademark

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

■ Master controlled Variable Speed Drives (VSD)

The PROFIBUS Field-bus was designed to give you
unprecedented flexibility and command over your
VSD controlled system. The PROFIBUS will perform
as an integrated part of your VLT VSD, giving you
access to all parameters relevant to your application.
The VSD will always act as a slave, and together with
a master it can exchange a multitude of information
and commands. Control signals such as speed
reference, start / stop of motor, reverse operation,
etc. are transmitted from the master in the form of a
telegramme. The VSD acknowledges receipt by
transmitting status signals, such as running, on
reference, motor stopped and so on to the master.
The VSD may also transmit fault indications, alarms
and warnings to the master, such as Overcurrent or
Phaseloss.

The PROFIBUS communicates according to the

PROFIBUS Protocol Standard DIN 19245 parts 1 and

3. This means that it can communicate with all

masters that comply with this standard, but it does
not necessarily mean that all services available in the
PROFIBUS standard are supported. The VDI / VDE
3689 PROFIBUS Profile for Variable Speed Drives is a
subset of PROFIBUS which only supports the
services relevant to speed control applications.
PROFIDRIVE is an implementation of VDI / VDE 3689
profile created by DANFOSS and a number of other
companies.

Communication partners
In a control system the VSD will always act as a slave,
and as such it may communicate with a single master
or multiple masters depending on the nature of the
application. A master may be a PLC or a PC that is
equipped with a PROFIBUS communication card.

■ Physical layer

The field of application of a field-bus system is
primarily determined by the transmission media and
the physical bus interface selected. The type of bus
cable required for the application and its installation
(physical layer) are particularly important factors, in
addition to the required transmission reliability of the
physical level.

Though a fundamental feature of the PROFIBUS stan­dard is the possibility of specifying several different
physical interfaces, the standard, at the time of
printing, has allowed for one universal specification
only, namely the EIA Standard RS 485-A, which has
found acceptance both in the field of factory automa­tion and in several areas of the processing industry.

The PROFIBUS Interface

■ Cable lengths/number of nodes

The maximum cable length in one segment is
depending on the transmission speed. The total cable
length includes drop cables if any. A drop cable is the
connection from the main bus cable to each node if a
T-connection is used instead of connecting the main
bus cable directly to the nodes, see drop cable
length. The table below shows the maximum allowed
cable length and maximum number of nodes/VLT’s
with 1, 2, 3 and 4 bus segments.

Max. total bus cable lenght

1 segment: 2 segments: 3 segments: 4 segments:

32 nodes 64 nodes 96 nodes 128 nodes
Transmission (31 VLT) (1 repeater, 61 VLT) (2 repeaters, 91 VLT) (3 repeaters, 121 VLT)
speed [m] [m] [m] [m]

9.6-187.5 kBaud 1000 2000 3000 4000
500 kBaud 400 800 1200 1600

1.5 MBaud 200 400 600 800

3 MBaud 100 200 300 400

Note that a repeater is a node in both of the two
segments it connects. The number of VLT is based on
a single master system. If there are more masters the
number of VLT must be reduced correspondingly.

MG.90.A2.02 – VL T is a registered Danfoss trademark

5

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

The total drop cable length for one segment is limited
as stated in the table below.

Drop cable length

Max. drop cable
length per segment

Transmission speed [m]

9.6-93.75 kBaud 96

187.5 kBaud 75
500 kBaud 30

The PROFIBUS Interface

1.5 MBaud 10

3 MBaud none

The length statements in the tables above are valid
provided that bus cable with the following properties
is used:

- Impedance: 135 to 165 ohm
at a measuring frequency from 3 to
20 MHz

- Resistance: <110 ohm/km

- Capacity: < 30pF/m

- Damping: max. 9 dB over the whole wire
length

- Cross section: max. 0.34 mm

2

,

corresponding to AWG 22

- Cable type: twisted in pairs,

1 x 2, or 2 x 2, or 1 x 4 wires

- Screening: Copper-braided screen

or braided screen and foil screen

It is recommended to use the same cable type in the
entire network to avoid impedance mismatch.

The numbers on the following drawing indicate the
maximum number of stations in each segment. They
are

not the station addresses as each station in the

network must have a unique address.

Segment 1

Segment 2

Segment 3

Segment 4

Rt = termination

resistors

6

MG.90.A2.02 – VL T is a registered Danfoss trademark

FCM 300:FCM 300:

FCM 300:

FCM 300:FCM 300:

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

The PROFIBUS Interface

■ Physical connection

The PROFIBUS is connected to the bus line via X100,
terminals 1 and 2.

It is recommended to use a master with a galvanic
isolated bus driver and with over voltage protection
(e.g. zenerdiode).

EMC precautions
The following EMC precautions are recommended to
obtain interference free operation of the PROFIBUS
network. Additional information on EMC can be found
in the design guide on the FC motor (MG.03.Bx.02).
Please also consult the manual of the PROFIBUS
master for further installation guidelines.

If the PROFIBUS cable has to cross a motor and
brake resistor cable they must cross each other at
an angle of 90°.

- Connection of the cable screen

The screen of the PROFIBUS cable must always
be connected to ground at both ends, that means
the screen must be connected to ground in all
stations connected to the PROFIBUS network. It
is very important to have a low impedance
ground connection of the screen, also at high

frequencies.This can be obtained by connecting
the surface of the screen to ground, for example
by means of a cable clamp or a conductive cable
gland.

The FC motor Series is provided with different

clamps and brackets to enable a proper ground
connection of the PROFIBUS cable screen. The
screen connection is shown in the following
drawing.

Relevant national and local regulations, for
example regarding protective earth
connection, must be observed.

- Cable routing
The PROFIBUS communication cable must be

kept away from motor and brake resistor cables to
avoid coupling of high frequency noise from one
cable to the other. Normally a distance of 200 mm
is sufficient, but it is generally recommended to
keep the greatest possible distance between the
cables, especially where cables are running in

parallel over long distances.

- Earth connection
It is important that all stations connected to the

PROFIBUS network are connected to the same
earth potential. The earth connection must have a
low HF (high frequency) impedance. This can be
achieved by connecting a large surface area of the
cabinet to earth, for example by mounting the FC
motor on a conductive rear plate.

Especially when having long distances between

the stations in a PROFIBUS network it can be

necessary to use additional potential equalizing

cables, connecting the individual stations to the
same earth potential.

Connecting the bus line

MG.90.A2.02 – VL T is a registered Danfoss trademark

7

FCM 300:FCM 300:

FCM 300:

FCM 300:FCM 300:

The bus termination

See drawing on page 6

The PROFIBUS Interface

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

It is essential that the bus line be terminated properly.
A mismatch of impedance may result in reflections
on the line that will corrupt data transmission.

- The PROFIBUS is provided with a suitable
termination which may be activated by the
switches of the RS485 switch block located
just to the left of the terminal block X100 (see
drawing below). The switches should be on to
terminate the bus.

The switches should never be left in opposite
positions. They should either both be ON or
both be OFF!

- Most masters and repeaters are equipped with
their own termination.

- If an external termination circuit consisting of three
resistors is connected to the bus line a 5 V d.c.
power supply must be used, please note that this
must be galvanically isolated from the a.c. line.

8

MG.90.A2.02 – VL T is a registered Danfoss trademark

FCM 300:FCM 300:

FCM 300:

FCM 300:FCM 300:

■ LEDs

There are 2 LEDs on the PROFIBUS:
LED303: Lights up when the card is initialized

and ready to communicate. It will
flash while auto baudrate detection is
attempting to detect the actual
baudrate.

LED304: Lights up when the card is

communicating, depending on
baudrate.

A high baudrate results in dim light in LED304.

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

The PROFIBUS Interface

MG.90.A2.02 – VL T is a registered Danfoss trademark

9

VLVL

T 2800T 2800

VL

T 2800

VLVL

T 2800T 2800

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

::

:

::

■ Physical connection

The PROFIBUS is connected to the bus line via,
terminals 68 and 69.

It is recommended to use a master with a galvanic
isolated bus driver and with over voltage protection
(e.g. zenerdiode).

The PROFIBUS Interface

EMC precautions
The following EMC precautions are recommended to
obtain interference free operation of the PROFIBUS
network. Additional information on EMC can be found
in the design guide on the VLT 2800 (MG.28.Ex.02).
Please also consult the manual of the PROFIBUS
master for further installation guidelines.

If the PROFIBUS cable has to cross a motor and
brake resistor cable they must cross each other at
an angle of 90°.

- Connection of the cable screen
The screen of the PROFIBUS cable must always
be connected to ground at both ends, that means
the screen must be connected to ground in all
stations connected to the PROFIBUS network. It
is very important to have a low impedance
ground connection of the screen, also at high
frequencies.This can be obtained by connecting
the surface of the screen to ground, for example
by means of a cable clamp or a conductive cable
gland.

The VLT 2800 Series is provided with different
clamps and brackets to enable a proper ground
connection of the PROFIBUS cable screen. The
screen connection is shown in the following
drawing.

Relevant national and local regulations, for
example regarding protective earth
connection, must be observed.

- Cable routing
The PROFIBUS communication cable must be
kept away from motor and brake resistor cables to
avoid coupling of high frequency noise from one
cable to the other. Normally a distance of 200 mm
is sufficient, but it is generally recommended to
keep the greatest possible distance between the
cables, especially where cables are running in
parallel over long distances.

- Earth connection
It is important that all stations connected to the
PROFIBUS network are connected to the same
earth potential. The earth connection must have a
low HF (high frequency) impedance. This can be
achieved by connecting a large surface area of the
cabinet to earth, for example by mounting the VLT
2800 on a conductive rear plate.

Especially when having long distances between
the stations in a PROFIBUS network it can be
necessary to use additional potential equalizing
cables, connecting the individual stations to the
same earth potential.

Connecting the bus line

10

MG.90.A2.02 – VL T is a registered Danfoss trademark

VLVL

T 2800T 2800

VL

T 2800

VLVL

T 2800T 2800

The bus termination

See drawing on page 6

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

The PROFIBUS Interface

::

:

::

It is essential that the bus line be terminated properly.
A mismatch of impedance may result in reflections on
the line that will corrupt data transmission.

- The PROFIBUS is provided with a suitable
termination which may be activated by the
switches of the RS485 switch block located
just to the left of the terminal block X100 (see
drawing below). The switches should be on to
terminate the bus.

The switches should never be left in opposite
positions. They should either both be ON or
both be OFF!

- Most masters and repeaters are equipped with
their own termination.

- If an external termination circuit consisting of three
resistors is connected to the bus line a 5 V d.c.
power supply must be used, please note that this
must be galvanically isolated from the a.c. line.

MG.90.A2.02 – VL T is a registered Danfoss trademark

11

VLVL

T 2800T 2800

VL

T 2800

VLVL

T 2800T 2800

■ LEDs

There are 2 LEDs on the PROFIBUS:
LD851: Lights up when the card is initialized

and ready to communicate. It will
flash while auto baudrate detection is
attempting to detect the actual

The PROFIBUS Interface

LD852: Lights up when the card is

A high baudrate results in dim light in LD852.

baudrate.

communicating, depending on
baudrate.

::

:

::

FCM 300 PROFIBUS / VLT 2800 PROFIBUS

12

MG.90.A2.02 – VL T is a registered Danfoss trademark