Danfoss VLT® HVAC Drive BACnet Operating Instr Operating instructions

Contents

1. Introduction

3

Introduction 3

2. Safety

7

Copyright, Limitation of Liability and Revision Rights 7

Safety Precautions 7

3. How to Install

11

The BACnet Option 11

System Specifications 15

4. How to Configure the System

17

Configuring BACnet 17

BIBBs 18

Example of a simple setup of BACnet 19

5. How to Control the Frequency Converter

21

Network Frequency Converter Control Inputs and -Outputs 21

Frequency Converter Feedback to Network 34

6. Parameters

37

Parameter Overview 37

Parameter Description 37

7. Troubleshooting

45

Alarm-, Warning and Extended Status Word 45

Alarm words 46

Warning words 47

Extended status words 48

LED Status 49

Index

50

VLT

®

HVAC Drive BACnet Operating Instruc-

tions

Contents

MG.11.D1.02 - VLT

®

is a registered Danfoss trademark

1

1. Introduction

VLT

®

HVAC Drive BACnet Operating Instruc-

tions

2

MG.11.D1.02 - VLT

®

is a registered Danfoss trademark

1

1. Introduction

1.1. Introduction

1.1.1. About this Manual

First time users can obtain the most essential

information for quick installation and set-up in

these chapters:

Introduction

How to Install

How to Configure the System

Application Example

For more detailed information including the

full range of set-up options and diagnosis

tools please refer to the chapters:

How to Control the FC 100

How to Access FC 100 Parameters

Parameters

Troubleshooting

1.1.2. Technical Overview

BACnet (Building Automation and Control Net-

work) is an open data communications proto-

col, American National Standard (ANSI/ASH-

RAE 135-1995). BACnet provides a means by

which computer-based control equipment

from different manufacturers can work to-

gether. BACnet is designed to handle many

types of building controls, including HVAC,

lighting, security, fire, access control, mainte-

nance and waste management. BACnet per-

mits flexibility for expansion and different

equipment combinations.

Conformance Classes, Function Groups and

the PICS: Evaluating the capabilities of a BAC-

net device is potentially a formidable task,

given the great choice of Objects, Properties

and Services, which can be implemented, as

well as the fact that it is not necessary for ev-

ery BACnet device to have a full BACnet im-

plementation in order to carry out its task.

ASHRAE's BACnet Committee recognized this

problem and responded with aids to evalua-

tion in the form of "Conformance Classes,"

"Function Groups" and the "Protocol Imple-

mentation Conformance Statement" (PICS).

The BACnet protocol defines six levels of Con-

formance Classes, each of which specifies the

minimum subset of Services implemented on

the device. The lowest level, Conformance

Class 1, requires only that the BACnet device

contain a Device Object and that it be able to

execute (respond to) a ReadProperty Service

request. Each successive Conformance Class

level adds Service Requests that must be ex-

ecutable by the device, as well as the Service

Requests it must be able to initiate. Conform-

ance Class 6 requires 21 types of Service Re-

quests (of the 32 overall) to be implemented,

of which 20 must be initi able and 17 execut-

able. Conformance Class thus provides a

measure of the device's ability to communi-

cate.

Function Groups specify a combination of Ob-

jects and Services necessary to carry out cer-

tain building automation functions. They are

specified independently of Conformance

Class, though the implementation of some of

the Function Groups automatically confers

some Conformance Class higher than 1.

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HVAC Drive BACnet Operating Instruc-

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1. Introduction

MG.11.D1.02 - VLT

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is a registered Danfoss trademark

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1

Background information

Protocol name: BACnet

Technology developer: ASHRAE

Year introduced: 1995

Governing standards: ANSI/ASHRAE Standard 135-2004, ISO

16484-5

Openness: Open specification

Physical characteristics

Network topology: Bus

Physical media: Shielded twisted pair

Max. Distance at low speed: 1200 meters

Transport mechanism

Communication methods: Master/slave

Baud Rates Supported: 9600, 19200, 38400, 76800

Termination: 120 ohm

1. Introduction

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HVAC Drive BACnet Operating Instruc-

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MG.11.D1.02 - VLT

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1.1.3. Assumptions

This manual assumes you are using a Danfoss

BACnet Option Card in conjunction with a

Danfoss FC 100 series frequency converter. It

is also assumed that your master is a BMS or

PC equipped with a serial communication card

supporting all the BACnet communication

services required by your application, and that

all requirements stipulated in the BACnet

standard, as well as those pertaining to the

VLT Variable Speed Drive are strictly observed

as well as all limitations therein fully respec-

ted.

1.1.4. Background Knowledge

The Danfoss BACnet Option Card is designed

to communicate with any master complying

with the BACnet standard. Familiarity with the

PC or PLC used as a master in the system is

assumed. Issues regarding hardware or soft-

ware produced by other manufacturers are

beyond the scope of this manual and are not

the responsibility of Danfoss.

If you have questions regarding set-up of

master-to-master communication or commu-

nication to a non-Danfoss slave, please con-

sult the appropriate manuals.

1.1.5. Available Literature

- Operating Instructions MG.11.Ax.yy provide the neccessary information for getting the

drive up and running.

- Design Guide MG.11.Bx.yy entails all technical information about the drive and customer

design and applications.

- Programming Guide MG.11.Cx.yy provides information on how to programme and in-

cludes complete parameter descriptions.

- Mounting Instruction, Analog I/O Option MCB109, MI.38.Bx.yy

-

VLT

®

6000 HVAC Application Booklet, MN.60.Ix.yy

-

Operating Instructions VLT

®

HVAC Drive BACnet, MG.11.Dx.yy

-

Operating Instructions VLT

®

HVAC Drive Profibus, MG.33.Cx.yy.

-

Operating Instructions VLT

®

HVAC Drive Device Net, MG.33.Dx.yy

-

Operating Instructions VLT

®

HVAC Drive LonWorks, MG.11.Ex.yy

-

Operating Instructions VLT

®

HVAC Drive High Power, MG.11.Fx.yy

-

Operating Instructions VLT

®

HVAC Drive Metasys, MG.11.Gx.yy

x = Revision number

yy = Language code

Danfoss Drives technical literature is also available online at

www.danfoss.com/BusinessAreas/

DrivesSolutions/Documentations/Technical+Documentation.htm

.

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HVAC Drive BACnet Operating Instruc-

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1. Introduction

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1.1.6. Abbreviations

ACI Acyclical Control Interval PCD Process Data

AOC Application Orientated Controller PCA Parameter Characteristics

BMS Building Management System PCV Parameter-Characteristics-

Value

CAN Controller Area Network PDU Protocol Data Unit

CTW Control Word PLC Programmable Logic Con-

trol

EE-

PROM

Electrical Erasable Programmable Read Only

Memory

PNU Parameter Number

EIA Electronic Industries Association: Specifies of the

EIA Standard RS 485-A

PVA Parameter Value

EMC Electromagnetic Compatibility RC Request/Response Charac-

teristics

FDL Fieldbus Data link Layer STW Status Word

FDT Field Device Tool

IND Sub index

I/O Input/Output

ISO International Standards Organization

LCD Liquid Crystal Display

LCP Local Control Panel

LED Light Emitting Diode

MAV Main Actual Value

MOC Motion Orientated Controller

MRV Main Reference Value

PC Personal Computer

1. Introduction

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2. Safety

2.1. Safety

2.1.1. Copyright, 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 from Danfoss A/S or equipment from other vendors provided that such equipment is

intended for communication with Danfoss equipment over a serial communication link. This pub-

lication 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 pro-

vided 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, neither expressed nor implied, with respect to this doc-

umentation, 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 to its

contents without prior notice or any obligation to notify former or present users of such revisions

or changes.

2.1.2. Safety Precautions

The voltage of the frequency converter is dangerous whenever connected to mains.

Incorrect installation of the motor, frequency converter or fieldbus may cause dam-

age to the equipment, serious personal injury or death. Consequently, the instruc-

tions in this manual, as well as national and local rules and safety regulations, must

be complied with.

Safety Regulations

1. The mains supply to the frequency converter must be disconnected whenever repair work

is to be carried out. Check that the mains supply has been disconnected and that the

necessary time has elapsed before removing motor and mains supply plugs.

2. The [OFF] button on the control panel of the frequency converter does not disconnect

the mains supply and consequently it must not be used as a safety switch.

3. The equipment must be properly earthed, the user must be protected against supply

voltage and the motor must be protected against overload in accordance with applicable

national and local regulations.

4. The earth leakage current exceeds 3.5 mA.

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HVAC Drive BACnet Operating Instruc-

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2. Safety

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5. Protection against motor overload is not included in the factory setting. If this function

is desired, set par.

1-90 Motor Thermal Protection

to data value ETR trip 1 [4] or data

value ETR warning 1 [3].

6. Do not remove the plugs for the motor and mains supply while the frequency converter

is connected to mains. Check that the mains supply has been disconnected and that the

necessary time has elapsed before removing motor and mains plugs.

7. Please note that the frequency converter has more voltage sources than L1, L2 and L3,

when load sharing (linking of DC intermediate circuit) or external 24 V DC are installed.

Check that all voltage sources have been disconnected and that the necessary time has

elapsed before commencing repair work.

Warning against unintended start

1. The motor can be brought to a stop by means of digital commands, bus commands,

references or a local stop, while the frequency converter is connected to mains. If per-

sonal safety considerations (e.g. risk of personal injury caused by contact with moving

machine parts following an unintentional start) make it necessary to ensure that no un-

intended start occurs, these stop functions are not sufficient. In such cases the mains

supply must be disconnected or the

Safe Stop

function must be activated.

2. The motor may start while setting the parameters. If this means that personal safety

may be compromised (e.g. personal injury caused by contact with moving machine

parts), motor starting must be prevented, for instance by use of the

Safe Stop

function

or secure disconnection of the motor connection.

3. A motor that has been stopped with the mains supply connected, may start if faults occur

in the electronics of the frequency converter, through temporary overload or if a fault in

the power supply grid or motor connection is remedied. If unintended start must be

prevented for personal safety reasons (e.g. risk of injury caused by contact with moving

machine parts), the normal stop functions of the frequency converter are not sufficient.

In such cases the mains supply must be disconnected or the

Safe Stop

function must be

activated.

NB!

When using the

Safe Stop

function, always follow the instructions in the

Safe Stop

section.

4. Control signals from, or internally within, the frequency converter may in rare cases be

activated in error, be delayed or fail to occur entirely. When used in situations where

safety is critical, e.g. when controlling the electromagnetic brake function of a hoist ap-

plication, these control signals must not be relied on exclusively.

Touching the electrical parts may be fatal - even after the equipment has been dis-

connected from mains.

Also make sure that other voltage inputs have been disconnected, such as external 24 V DC, load

sharing (linkage of DC intermediate circuit), as well as the motor connection for kinetic back up.

Protection Mode

Once a hardware limit on motor current or dc-link voltage is exceeded the drive will enter “Pro-

tection mode”. “Protection mode” means a change of the PWM modulation strategy and a low

switching frequency to minimize losses. This continues 10 sec after the last fault and increases

the reliability and the robustness of the drive while re-establishing full control of the motor.

In hoist applications “Protection mode” is not usable because the drive will usually not be able to

leave this mode again and therefore it will extend the time before activating the brake – which is

not recommendable.

2. Safety

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The “Protection mode” can be disabled by setting parameter 14-26 “Trip Delay at Inverter Fault”

to zero which means that the drive will trip immediately if one of the hardware limits is exceeded.

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2. Safety

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3. How to Install

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3. How to Install

3.1. The BACnet Option

3.1.1. Installation of the Option

Items required to install a fieldbus option in the frequency converter:

- - The fieldbus option

- - Fieldbus option adaptor frame for the frequency converter. This frame is deeper than

the standard frame, to allow space for the fieldbus option beneath.

- - Cable holders

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Instructions:

- - Remove the LCD panel from the frequency converter.

- - Remove the frame located beneath and discard.

- - Push the option into place. Two positions are possible, with cable terminal facing either

up or down. The cable up position is often most suitable when several frequency con-

verters are installed side by side in a rack, as this position permits shorter cable lengths.

- - Push the fieldbus option adaptor frame for the frequency converter into place.

- - Remove the Plug for the FC Port and connect the Plug that is connected to the BACnet

Option

- - Replace the LCD panel.

- - Attach cable.

- - Fasten the cable in place using cable holders. The frequency converter top surface has

pre-drilled threaded holes for attaching the cable holders to the unit.

3.1.2. Cabling

Cable lengths and number of nodes

The maximum cable length allowable in one segment is dependent 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 permissible cable length and maximum

number of nodes/Drivess with 1, 2, 3 and 4 bus segments.

3. How to Install

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Drop cable connection (i.e. T-connection) beyond the cable lengths indicated is not recommended,

due to the increased risk of reflection occurring. Instead, Danfoss recommends direct connection

of the frequency converter.

Note that a repeater is a node in both of the two segments it connects. The number of frequency

converters is based on a single master system. If there are two or more masters (e.g. PC tools,

Routers), the number of frequency converters must be reduced correspondingly.

Network topology Maximum cable length

Free topology without repeater 500 m

Free topology with one repeater 1000 m

Free topology maximum device-to-device 500 m

Bus topology single terminated 500 m

Bus topology double terminated without repeater 2700 m

Bus topology double terminated with one repeater 5400 m

Bus topology maximum stub length 3 m

The length statements in the tables above are valid for bus cable with the following properties:

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

- Resistance: <110 Ohm/km

- Capacitance: <30 pF/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

Use of the same cable type throughout the entire segment is recommended to avoid impedance

mismatch.

3.1.3. Network Termination

Connecting the Bus Line

Connect the BACnet Option Card to the bus

line via terminals 62, 63 and 66. Terminal 62

is Marked Red and Terminal 62 is marked

Green. These two are the RS485 lines. Termi-

nal 66 the signal Ground for the RS485 Trans-

mitter. In large systems it is recommended to

use

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Maximum Cable Lengths

Maximum total bus cable length: 4000Feet ~ 1200Meter

3.1.4. Cable Routing

The BACnet communication cable must be

kept away from motor and brake resistor ca-

bles to avoid coupling of high frequency noise

from one cable to the other. Normally a dis-

tance of 200 mm is sufficient, but maintaining

the greatest possible distance between cables

is generally recommended, especially where

cables run in parallel over long distances.

When crossing is unavoidable, the BACnet ca-

ble must cross motor and brake resistor cables

at an angle of 90 degrees.

3. How to Install

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3.2. System Specifications

3.2.1. EMC Precautions

The following EMC precautions are recom-

mended to achieve interference-free opera-

tion of the BACnet network. Additional EMC

information is available in the

VLT

®

HVAC

Drive Design Guide, MG.11.Bx.yy

. Please also

consult the BACnet master manual for further

installation guidelines.

NB!

Ensure compliance with relevant national and local regulations, for example in pro-

tective earth connection.

3.2.2. Connection of the Cable Screen

It is recommended to connect the screen to

ground in both end of the Bus Cable. This en-

sures the optimum resistance towards EMC

noise. screen of the BACnet cable must always

be connected to ground at both ends, mean-

ing the screen must be connected to ground

in all stations connected to the BACnet net-

work. It is very important to have a low im-

pedance 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 100

Series has various clamps and brackets to en-

able a proper ground connection of the BAC-

net cable screen.

3.2.3. Earth Connection

It is important that all stations connected to

the BACnet network are connected to the

same earth potential. The earth connection

must have low HF (high frequency) impe-

dance. This can be achieved by connecting a

large surface area of the cabinet to earth, for

example by mounting the FC 100 series on a

conductive rear plate. Particularly when there

are long distances between the stations in a

BACnet network, it can be necessary to use

additional potential equalizing cables, con-

necting the individual stations to the same

earth potential. The use of Repeaters with

galvanic isolation or Fibre optic can improve

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the EMC performance and reduce Ground loop

Current.

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4. How to Configure the System

4.1. Configuring BACnet

4.1.1. Initialization Procedure

The Initialization Procedure is explained by the flow chart given below:

Initialization Parameter

General Settings

Name

Parameter

Number

Default Value Setting for BACnet

Control Site 8-01

Digital and control

word

Digital and control word

Control word source 8-02 FC RS-485 FC RS-485

ControlWord Timeout

time

8-03 1.0 sec 1.0 sec

ControlWord Timeout

Function

8-04 Off Off

End of Timeout Function 8-05 Resume setup Resume setup

Reset ControlWord Time-

out

8-06 Do not reset Do not reset

Diagnosis 8-07 Set up Don’t care

ControlWord Profile 8-10 FC Profile FC Profile

FC Port Settings

Name

Parameter

Number

Default Value Setting for BACnet

Protocol 8-30 FC FC Option

Address 8-31 1 1

Baud Rate 8-32 9600 baud 9600 baud

Minimum Response Delay 8-35 10 ms 10 ms

Max Response Delay 8-36 5000 ms 5000 ms

Table 4.1: 1) Please see also section: Parameter Overview >Parameter List.

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Digital/Bus settings

Name

Parameter

Number

Default Value Setting for BACnet

Coasting Select 8-50 Logic-or Logic-or

Quick Stop Select 8-51 Logic-or Logic-or

DC Brake Select 8-52 Logic-or Logic-or

Start Select 8-53 Logic-or Logic-or

Reversing Select 8-54 Logic-or Logic-or

Set-up Select 8-55 Logic-or Logic-or

Preset reference Select 8-56 Logic-or Logic-or

BACnet settings

Name

Parameter

Number

Default Value Setting for BACnet

BACnet device Instance 8-71 1 1

MS/TP Max Masters 8-73 127

Depent on the Number

of Masters in the system

I am transmit time 8-74 At power up At power up

Initialisation Password 8-75 “admin” “admin”

4.1.2. Control Word Time-out Function

Par. 8-03 Control Word Timeout Time

and

par. 8-04 Control Word Timeout Function

are not en-

abled in this version of the BACnet option.

4.2. BIBBs

4.2.1. Bibb's

ReadProperty Service

ReadPropertyMultiple Service

WriteProperty Service

WritePropertyMultiple Service

ConfirmedEventNotification Service

UnconfirmedEventNotification Service

GetEventInformation Service

AcknowledgeAlarm Service

ReinitializeDevice Service

DeviceCommunicationControl Service

I-Have Service

Who-Has Service

Who-Is Service

I-am Service

4. How to Configure the System

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TimeSynchronization

4.3. Example of a simple setup of BACnet

This example shows the necessary steps to set up the FC102 BACnet interface with the following

system requirements:

• • MS/TP running at 38.400 Baud

• • MAC address 20 for the FC102

• • BACnet Device Instance 0 1025

• • Highest number of a Master stack is 35

• • Start/stop of FC from BACnet only

• • Reference from BACnet

• • Read status of FC (Actual speed)

Set the following parameters:

Name Parameter number Value

Protocol 8-30 FC option [9]

Address 8-31 20

FC Port Baud Rate 8-32 38,400 Baud [4]

Coasting Select 8-50 Bus [1]

BACnet device Instance 8-70 1025

MS/TP Max Masters 8-72 35

After the parameters have been set according the table above, the drive has to be unpowered

and repowered before the changes take effect. When the frequency converter is detected by the

BMS, the drive can be controlled by BV:1, which will start the motor if set to [1]. Setting AV:0 will

set the speed reference of the drive. The actual speed can be monitored via AV:1. See also

Analog

Input- and Output Objects

section.

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5. How to Control the Frequency Converter

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