Danfoss Native BACnet VLT HVAC Drive Operating Instructions Manual

MAKING MODERN LIVING POSSIBLE

Operating Instructions

Native BACnet

VLT® HVAC Drive

Contents

Contents

VLT® HVAC Drive Native BACnet Operating Instructions

1 Safety

1.1.1 Copyright, Limitation of Liability and Revision Rights 2

1.1.4 Before Commencing Repair Work 3

1.1.5 Special Conditions 4

2 Introduction

3 How to Install

3.1 The BACnet Interface

3.1.4 Switches S201, S202, and S801 9

3.2 Bus Cabling

4 How to Configure the System

4.1 Configuring BACnet

4.2 Example of a simple setup of BACnet

5 BACnet Objects

5.1 Feedback to Network

5.2 BIBBs

2

5

7
7

10

11
11
12

13
20
20

6 Parameters

6.1 Parameter Overview

6.2 Parameter Description

7 Troubleshooting

7.1 Alarm, Warning and Extended Status Word

7.1.2 Alarm Words 28

7.1.3 Warning Words 29

22
22
24

27
27

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Safety

VLT® HVAC Drive Native BACnet Operating Instructions

11

1 Safety

1.1.1 Copyright, Limitation of Liability and

1.1.2

Safety Note

Revision Rights

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

Danfoss 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 has tested and reviewed the documen­tation within this manual, Danfoss makes no warranty or
representation, neither expressed nor implied, with respect
to this documentation, including its quality, performance, or
fitness for a particular purpose.

In no event shall Danfoss 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 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 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.

1. The frequency converter must be disconnected
from mains if repair work is to be carried out. Check
that the mains supply has been disconnected and
that the necessary time has passed before
removing motor and mains plugs.

2. The [STOP/RESET] key on the LCP of the frequency
converter does not disconnect the equipment from
mains and is thus not to be used as a safety switch.

3. Correct protective earthing of the equipment must
be established, 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 currents are higher than 3.5mA.

5. Protection against motor overload is set by
1-90 Motor Thermal Protection. If this function is
desired, set 1-90 Motor Thermal Protection to data
value [ETR trip] (default value) or data value [ETR
warning]. Note: The function is initialized at 1.16 x
rated motor current and rated motor frequency.
For the North American market: The ETR functions
provide class 20 motor overload protection in
accordance with NEC.

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
passed before removing motor and mains plugs.

7. Please note that the frequency converter has more
voltage inputs than L1, L2 and L3, when load
sharing (linking of DC intermediate circuit) and
external 24V DC have been installed. Check that all
voltage inputs have been disconnected and that
the necessary time has passed before commencing
repair work.

2 MG.14.C1.02 - VLT® is a registered Danfoss trademark

Safety

VLT® HVAC Drive Native BACnet Operating Instructions

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 personal safety consider­ations make it necessary to ensure that no
unintended start occurs, these stop functions are
not sufficient.

2. While parameters are being changed, the motor
may start. Consequently, the stop key [STOP/RESET]
must always be activated; following which data can
be modified.

3. A motor that has been stopped may start if faults
occur in the electronics of the frequency converter,
or if a temporary overload or a fault in the supply
mains or the motor connection ceases.

Symbols

1.1.3

Symbols used in this manual

NOTE

Indicates something to be noted by the reader.

1 1

CAUTION

Indicates a general warning.

WARNING

Indicates a high-voltage warning.

Indicates default setting

✮

1.1.4 Before Commencing Repair Work

1. Disconnect the frequency converter from mains

2. Disconnect DC bus terminals 88 and 89

3. Wait at least the time mentioned in section General
Warning above

4. Remove motor cable

MG.14.C1.02 - VLT® is a registered Danfoss trademark 3

Safety

VLT® HVAC Drive Native BACnet Operating Instructions

11

1.1.5 Special Conditions

Electrical ratings:
The rating indicated on the nameplate of the frequency
converter is based on a typical 3-phase mains power supply,
within the specified voltage, current and temperature range,
which is expected to be used in most applications.

The frequency converters also support other special
applications, which affect the electrical ratings of the
frequency converter.
Special conditions which affect the electrical ratings might
be:

Single phase applications

•

High temperature applications which require de-

•

rating of the electrical ratings
Marine applications with more severe environ-

•

mental conditions.

Other applications might also affect the electrical ratings.

Consult the relevant sections in this manual and in the VLT
HVAC Drive Design Guide, MG.11.BX.YY for information about
the electrical ratings.

Installation at High Altitudes (PELV)

1.1.6

WARNING

Hazardous Voltage!
By altitudes above 2km, please contact Danfoss regarding
PELV.
Avoid un-intended start
While the frequency converter is connected to mains, the
motor can be started/stopped using digital commands, bus
commands, references or via the LCP.

Disconnect the frequency converter from mains

•

whenever personal safety considerations make it
necessary to avoid unintended start.

To avoid unintended start, always activate the

•

[OFF] key before changing parameters.
Unless terminal 37 is turned off, an electronic fault,

•

temporary overload, a fault in the mains supply, or
lost motor connection may cause a stopped motor
to start.

Failure to follow recommendations could result in death or

®

serious injury.

Installation requirements:
The overall electrical safety of the frequency converter
requires special installation considerations regarding:

Fuses and circuit breakers for over-current and

•

short-circuit protection
Selection of power cables (mains, motor, brake,

•

loadsharing and relay)
Grid configuration (grounded delta transformer

•

leg, IT,TN, etc.)
Safety of low-voltage ports (PELV conditions)

•

Consult the relevant clauses in these instructions and in the
VLT® HVAC Drive Design Guide for information about the
installation requirements.

4 MG.14.C1.02 - VLT® is a registered Danfoss trademark

Introduction

2 Introduction

VLT® HVAC Drive Native BACnet Operating Instructions

2.1.1 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

For more detailed information including the full range of set­up options and diagnosis tools please refer to the chapters:

How to Control the Frequency Converter
Parameters
Troubleshooting

Technical Overview

2.1.2

BACnet (Building Automation and Control Network) is an
open data communications protocol, American National
Standard (ANSI/ASHRAE 135-1995). BACnet provides a
means by which computer-based control equipment from
different manufacturers can work together. BACnet is
designed to handle many types of building controls,
including HVAC, lighting, security, fire, access control,
maintenance and waste management. BACnet permits
flexibility for expansion and different equipment
combinations.

Conformance Classes, Function Groups and the PICS:
Evaluating the capabilities of a BACnet 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 every BACnet device to have a full
BACnet implementation in order to carry out its task.
ASHRAE's BACnet Committee recognized this problem and
responded with aids to evaluation in the form of
"Conformance Classes," "Function Groups" and the "Protocol
Implementation Conformance Statement" (PICS).

The BACnet protocol defines six levels of Conformance
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
executable by the device, as well as the Service Requests it
must be able to initiate. Conformance Class 6 requires 21
types of Service Requests (of the 32 overall) to be
implemented, of which 20 must be initi able and 17

executable. Conformance Class thus provides a measure of
the device's ability to communicate.

Function Groups specify a combination of Objects and
Services necessary to carry out certain 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.

Background information
Protocol name: BACnet
Technology developer: ASHRAE
Year introduced: 1995
Governing standards: ANSI/ASHRAE Standard

135-2008 version 4, 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

2.1.3 Assumptions

This manual assumes you are using the BACnet Protocol with
a FC102 series frequency converter. It is also assumed that
your system is equipped with a firmware supporting 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 respected.

Background Knowledge

2.1.4

The Danfoss BACnet Protocol is designed to communicate
with any system complying with the BACnet MS/TP standard.
Familiarity with the PC, BMS or PLC used as a master in the
system is assumed. Issues regarding hardware or software
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 communication to a non-Danfoss slave,
please consult the appropriate manuals.

2 2

MG.14.C1.02 - VLT® is a registered Danfoss trademark 5

Introduction

VLT® HVAC Drive Native BACnet Operating Instructions

2.1.5

Available Literature for VLT® HVAC

2.1.6

Abbreviations

Drive

22

- Operating Instructions MG.11.Ax.yy provide the
necessary information for getting the frequency
converter up and running.

-

Operating Instructions VLT® HVAC Drive High
Power, MG.11.Fx.yy

- Design Guide MG.11.Bx.yy entails all technical
information about the frequency converter and
customer design and applications.

- Programming Guide MG.11.Cx.yy provides
information on how to programme and includes
complete parameter descriptions.

- Mounting Instruction, Analog I/O Option MCB 109,
MI.38.Bx.yy

- Application Note, Temperature Derating Guide,
MN.11.Ax.yy

- PC-based Configuration Tool MCT 10, MG.10.Ax.yy
enables the user to configure the frequency
converter from a Windows™ based PC
environment.

-

Danfoss VLT® Energy Box software at

www.danfoss.com/BusinessAreas/DrivesSolutions

then choose PC Software Download

-

VLT® HVAC Drive Drive Applications, MG.11.Tx.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 BACnet,
MG.11.Dx.yy

-

Operating Instructions VLT® HVAC Drive LonWorks,
MG.11.Ex.yy

-

Operating Instructions VLT® HVAC Drive Metasys,
MG.11.Gx.yy

-

Operating Instructions VLT® HVAC Drive FLN,
MG.11.Zx.yy

- Output Filter Design Guide, MG.90.Nx.yy

- Brake Resistor Design Guide, MG.90.Ox.yy

x = Revision number
yy = Language code

ACI Acyclical Control Interval
AOC Application Orientated Controller
AV Analog Variable
BMS Building Management System
BV Binary Variable
CTW Control Word
EEPROM Electrical Erasable Programmable Read Only Memory
EIA Electronic Industries Association: Specifies of the EIA

Standard RS 485-A
EMC Electromagnetic Compatibility
I/O Input/Output
ISO International Standards Organization
LCP Local Control Panel
LED Light Emitting Diode
MAV Main Actual Value
MRV Main Reference Value
PC Personal Computer
PDU Protocol Data Unit
PELV Protected Extra Low Voltage
PLC Programmable Logic Control
PNU Parameter Number
STW Status Word

Danfoss technical literature is available in print from your
local Danfoss Sales Office or online at:

www.danfoss.com/BusinessAreas/DrivesSolutions/Documen­tations/Technical+Documentation.htm

6 MG.14.C1.02 - VLT® is a registered Danfoss trademark

How to Install

3 How to Install

VLT® HVAC Drive Native BACnet Operating Instructions

3.1 The BACnet Interface

3.1.1 Cabling

Cable lengths and number of nodes
For the correct function of a BACnet MS/TP system, it is mandatory to fulfill installation of the communication cables given in
this manual. Under correct installation it is possible to have up to 250 nodes (125 masters and 125 slaves) on 1200 meter (4000
feet) cable.

The use of drop cable connection (i.e. T-connection) is not allowed in a BACnet MS/TP system. Drop cables will lead to reflection
and malfunction of the system. In location where the cabling will demand a T-connection the use of repeaters is recommended.

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 devices (e.g. PC tools, Routers), the number of frequency converters must be reduced
correspondingly.

- Maximum length of an MS/TP segment: 1200 meters (4000 feet)

-

Characteristic impedance: 100 to 130Ω

-

Resistance: <110Ω/km

- Distributed capacitance: <100pF/m, between conductors

-

Cross section: 0.82mm2 conductor area, corresponding to AWG 18

- Cable type: twisted in pairs, 1 x 2, or 2 x 2 wires

- Screening: Copper-braided screen or braided screen and foil screen

3

3

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

MG.14.C1.02 - VLT® is a registered Danfoss trademark 7

130BA884.11

Ω

Ω

Ω

Ω

Ω

Ω

How to Install

VLT® HVAC Drive Native BACnet Operating Instructions

3.1.2 Network Connection

Connect the frequency converter to the RS-485 network as follows (see also diagram):

1. Connect signal wires to terminal 68 (P+) and terminal 69 (N-) on the main control board of the frequency converter.

2.

Connect the cable screen as described under chapter Bus Cabling.

3

NOTE

Screened, twisted-pair cables are recommended to reduce
noise between conductors.

3.1.3 Network Termination

Maximum Cable Lengths
Maximum total bus cable length: 4000 feet ~ 1200m

8 MG.14.C1.02 - VLT® is a registered Danfoss trademark

130BT310.10

1

2

N O

VLT

BUS TER.
OFF-ON

A53 A54
U- I U- I

Fieldbus cable

Brake resistor

Min.200mm

90° crossing

130BA080.10

How to Install

VLT® HVAC Drive Native BACnet Operating Instructions

3.1.4 Switches S201, S202, and S801

Switches S201 (A53) and S202 (A54) are used to select a
current (0-20mA) or a voltage (-10 to 10V) configuration of
the analog input terminals 53 and 54 respectively.

Switch S801 (BUS TER.) can be used to enable termination on
the RS-485 port (terminals 68 and 69).

See drawing Diagram showing all electrical terminals in
section Electrical Installation.

Default setting:

S201 (A53) = OFF (voltage input)
S202 (A54) = OFF (voltage input)
S801 (Bus termination) = OFF

NOTE

When changing the function of S201, S202 or S801 be careful
not to use force for the switch over. It is recommended to
remove the LCP fixture (cradle) when operating the switches.
The switches must not be operated with power on the
frequency converter.

3.1.5 Cable Routing

The BACnet 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 200mm 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 cable must cross
motor and brake resistor cables at an angle of 90°.

3

3

MG.14.C1.02 - VLT® is a registered Danfoss trademark 9

How to Install

3.2 Bus Cabling

VLT® HVAC Drive Native BACnet Operating Instructions

3

3.2.1 EMC Precautions

The following EMC precautions are recommended to achieve
interference-free operation 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.

Ensure compliance with relevant national and local
regulations, for example in protective earth connection.

3.2.2 Single Ground Shielding

For installing the bus cable on MS/TP, two different
strategies can be followed, Single ground of shield and
multiple ground of shield. Each strategy has both
advantages and disadvantages. The following chapter
explains the different between the two strategies. The single
ground shield is specified in the ANSI/ASRAHE 135-2004
standard. The solution benefits by having only one ground
connection of the shield, by doing so the possibility for
ground loop of equalizing current is heavily reduced. In
these systems the shield of the MS/TP cables has to be
isolated from ground at all stations, except one. At each
station the shield from the two cables has to be connected
with each other, and isolated from ground. The best solution
for this has been proven to be the use of shrink tubes. The
single ground shielding is a good approach where the
system uses long bus cables. If two buildings have to be
connected over the same MS/TP bus cable, the use of fibre
optic has to be considered. This will prevent that a lightning
stroke will be carried from one building to another, and
problem with difference in earth potential can be neglected.

Multiple Ground Shielding

3.2.3

If the distance between the individual drives is limited (e.g.
inside a cabinet or in one control room) Danfoss
recommends connecting the screen to ground at both ends
of the bus cable. This ensures the maximum protection from
EMC noise. Connecting the screen at each end will require
that each BACnet device has the same earth potential or an
equalizing current will flow in the screen of the cable and
cause disturbance and poor performance of the system. Low
impedance to ground connection of the screen can be
achieved by connecting the surface of the screen to ground,
by means of a cable clamp or a conductive cable gland. The
FC 100 Series supplies various clamps and brackets to enable
a proper ground connection of the BACnet cable screen.

Danfoss recommends to connect the screen to ground at
both ends of the bus cable. This ensures the maximum
protection from EMC noise. Connecting the screen at each
end will require that each BACnet device has the same earth
potential or else an equalizing current will flow in the screen
of the cable and cause disturbance and poor performance of
the system. Where this is not possible, the screen can be
isolated from the chassis of the drive by use of shrink-tubing.
It must be pointed out that the routing of the BACnet cable
must be established with a maximum distance to other
cables such as mains, motor cable, etc.

10 MG.14.C1.02 - VLT® is a registered Danfoss trademark

How to Configure the System

VLT® HVAC Drive Native BACnet Operating Instructions

4 How to Configure the System

4.1 Configuring BACnet

4.1.1 Initialization Procedure

Parameter Default Value Setting for BACnet

8-01 Control Site
8-02 Control Source
8-03 Control Timeout Time
8-04 Control Timeout Function
8-05 End-of-Timeout Function
8-06 Reset Control Timeout
8-07 Diagnosis Trigger
8-09 Communication Charset
8-10 Control Profile

Table 4.1 General Settings

Parameter Default Value Setting for BACnet

8-30 Protocol
8-31 Address
8-32 Baud Rate
8-35 Minimum Response Delay
8-36 Maximum Response Delay

Table 4.2 FC Port Settings

1

) Depending on your application.

2)

Depending on the BMS system

3)

The adress setting is depending on the system and each device connected to the BACnet MS/TP must have a unique adress on

Digital and control word Digital and control word

FC RS485 FC RS-485

60 sec 1)

Off 1)

Resume setup 1)

Do not reset 1)

Disable n.a.
ANSI X3.4
FC Profile 2)

FC BACnet

1

9600 9600 baud

10ms 10ms

5000ms 5000ms

3

1

this MS/TP network. Please also see section Parameter Overview >Parameter List.

4 4

Parameter

8-50 Coasting Select
8-52 DC Brake Select
8-53 Start Select
8-54 Reversing Select
8-55 Set-up Select
8-56 Preset Reference Select

Table 4.3 Digital/Bus Settings

Name

8-70 BACnet Device Instance
8-72 MS/TP Max Masters
8-74 "I-Am" Service
8-75 Initialisation Password

Table 4.4 BACnet Settings

1

) The device instance setting is depending on the system, and each device connected to the BACnet MS/TP must have a unique

Default Value Setting for BACnet

Logic-or Logic-or
Logic-or Logic-or
Logic-or Logic-or
Logic-or Logic-or
Logic-or Logic-or
Logic-or Logic-or

Default Value Setting for BACnet

1

127 Dependent on the Number of Masters in the system

At power up At power up

“admin” “admin”

1

1

device instance in the complete system.

MG.14.C1.02 - VLT® is a registered Danfoss trademark 11

How to Configure the System

VLT® HVAC Drive Native BACnet Operating Instructions

4.1.2 Control Word Time-out Function

8-03 Control Timeout Time and 8-04 Control Timeout Function
are not enabled in this version of the BACnet option.

4.2 Example of a simple setup of BACnet

This example shows the necessary steps to set up the FC102

44

BACnet interface with the following system requirements:

MS/TP running at 38,400 Baud

•

MAC address 20 for the FC102 on the MS/TP

•

network
Device Instance number 1025 for the FC102

•

Highest number of a Master device is 35

•

Start/stop of FC from BACnet only

•

Reference from BACnet

•

Read status of FC (Actual speed)

•

Set the following parameters:
Parameter Value

8-30 Protocol
8-31 Address
8-32 Baud Rate
8-50 Coasting Select
8-70 BACnet Device Instance
8-72 MS/TP Max Masters

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:1 will set
the speed reference of the drive. The actual speed can be
monitored via AV:3. See also Analog Input- and Output
Objects section.

BACnet [5]

20

38,400 Baud [4]

Bus [1]

1025

35

12 MG.14.C1.02 - VLT® is a registered Danfoss trademark

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

5 BACnet Objects

5.1.1 Analog Input- and Output Objects

Control the frequency converter from the BACnet network using 'objects'. The various types of 'objects' and their descriptions
are shown in the following tables. In the following tables all available objects are shown. The availability of objects depends on
the mounting of the B and/or C options.

Object_Name Present_Value
ID
AI:0 Analog Input 53 1662 %
AI:1 Analog Input 54 1664 %
AI:2 Analog In X30/11 1675 % MCB 101
AI:3 Analog In X30/12 1676 % MCB 101
AI:4 Analog In X42/1 1830 V MCB 109
AI:5 Analog In X42/3 1831 V MCB 109
AI:6 Analog In X42/5 1832 V MCB 109

Table 5.1 Analog Inputs Object Map

Default name Parameter Unit Option

5 5

Object_Name Present_Value

ID

AO:0
AO:1 Pulse out #27 Bus Control 593 % x x x
AO:2 Pulse out #29 Bus Control 595 % x x x

AO:3
AO:4 Analog Output X42/7 2643 V x x x MCB 109
AO:5 Analog Output X42/9 2653 V x x x MCB 109
AO:6 Analog Output X42/11 2663 V x x x MCB 109

Table 5.2 Analog Outputs

Default name Parameter Unit Writeable Cmd.able Timeout Option
Terminal 42 Output Bus
Control 653 % x x x

Terminal X30/8 Output Bus
Control 663 % x x x MCB 101

MG.14.C1.02 - VLT® is a registered Danfoss trademark 13

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

Object_Name Present_Value
Default

ID

AV:0 Reserved for VFD profile

AV:1

AV:2

AV:3

AV:4

55

AV:5
AV:6 Power x x 1610 kW
AV:7
AV:8
AV:9
AV:10
AV:11
AV:12
AV:13
AV:14

AV:15
AV:16
AV:17
AV:18
AV:19
AV:20

AV:21

AV:22
AV:23 kWh Counter 1502 kWh

AV:24
AV:25 Frequency 1613 Hz
AV:26 Torque 1622 %

AV:27

AV:28

AV:29
AV:30 Setpoint 1 2021 % x

AV:31
AV:32
AV:33
AV:34
AV:35 Setpoint 2 2022 % x

AV:36

name Writeable EEPROM Parameter Unit Writeable Cmd.able Timeout Option

Input
Reference 1 x x Note 1 % x x x
Input
Reference 2 Note 1 % x x x
Output
Speed x x Note 2 %
PID
Feedback Note 3 %
Motor
Current x x 1614 Amps

Reserved for VFD profile

Motor
Thermal 1618 %

Reserved for VFD profile

Operating
Hours 1500 Hours
Running
Hours 1501 Hours

Motor
Voltage 1612 V

DC Link
Voltage 1630 V
Heatsink
Temp. 1634 Deg
Inverter
Thermal 1635 %

Bus
Feedback 1 894 % x

Reserved for P, I, D

Bus
Feedback 2 895 % x

14 MG.14.C1.02 - VLT® is a registered Danfoss trademark

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

Object_Name Present_Value
Default

ID

AV:37

AV:39
AV:40 Setpoint 3 2023 % x

AV:41
AV:42
AV:43
AV:44

AV:45
AV:46
AV:47
AV:48
AV:49

AV:50
AV:51 Fault Code Note 4 NONE

AV:52

AV:53

AV:54

AV:55

AV:56

AV:57

name Writeable EEPROM Parameter Unit Writeable Cmd.able Timeout Option

Reserved for P, I, DAV:38

Bus
Feedback 3 896 % x

Reserved for P, I, D

Running
Bypass 3111 Hours MCO 104

Alarm Log:
Error Code 1530 NONE

PID Start
Speed 2083 Hz x
On
Reference
Bandwidth 2084 % x
PID Propor­tional Gain 2093 NONE x
PID Integral
Time 2094 Sec x
PID Differen­tiation Time 2095 Sec x
PID Diff. Gain
Limit 2096 NONE x

5 5

Table 5.3 Analog Values

1

Either AV:1 or AV:2 controls the drive reference. Only one of them can control the frequency converter at a time and BV:2

decides which one.

2

This value is not directly available in the frequency converter. The value must be calculated as follows:

Par

# 3 =

# 4 =

. 16 − 17

Par

Par

. 16 − 52

Par

. 20 − 14

. 4 − 13

× 100 %

× 100 %

AV

3

This value is not directly available in the frequency converter. The value must be calculated as follows:

AV

4

VLT® HVAC Drive fault codes are transmitted as an analog value in AV:51. The Fault codes are mapped as shown in table on

following page. The VLT® HVAC Drive alarm codes are shown as well for comparison.

MG.14.C1.02 - VLT® is a registered Danfoss trademark 15

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

The following table shows the mapping of the FC102 alarmcodes and their mapping to the BACnet's fault codes.

Fault codes Fault

Code
Communication Error 1 17, 34 Loss of communication with the network
Over Current 2 13, 40, 41, 42, 59 Instantaneous Output Current has exceeded

Over Temperature 3 11, 29, 65, 69, 74, 244, 245, 247 Heat sink Temperature Limit has been reached
Over Speed Deviation 4 49, 62 Inverter has exceeded maximum or programmed

Over Voltage 5 5, 7, 64 DC Bus Voltage has exceeded inverter limit
Under Voltage 6 1, 6, 8 DC Bus Voltage is lower than required inverter

VLT® HVAC Drive Alarms

55

Short Circuit 7 16 Inverter Output has shorted Phase to Phase
Ground Fault 8 14 Inverter Output Grounding Current has

Motor Overload 9 10, 50-58, 222 Motor is overloaded
Inverter Overload 10 9 Timed over current fault
Over Torque Detection 11 12 Programmed limit for torque has been exceeded
External Fault 12 142 External fault has been activated in the inverter.

Operator Interface Error 13 - Inverter programming or operational interface

Load Loss 14 3, 95, 229 Load on the Motor is less than programmed limit

Configuration Error 15 70, 76, 79, 81, 82, 91 Errors exist in the programmed or operational

Feedback Failure 16 60, 90, 192 Required system operational feedback (signal or

Output Phase Loss 17 30, 31, 32 One or more of the output phases from the

Motor Stall 18 99 Motor is operating in stall region and not able to

Power Unit Error 19 4, 33, 36, 37, 46, 228, 246 Error sensed on the power section of the inverter
Input Phase 20 - Input single phase or low line voltage condition
Internal Drive Failure 21 23, 27, 38, 39, 47, 48, 73, 85, 86 FC102 specific fault.

Fault Descriptions

inverter rated or programmed value

limit

limit

exceeded manufacturer

This is a hard fault that must be reset

malfunction

of system. An Example is a broken belt or
coupling

configuration of the inverter

sensor) is not responding as expected for correct
system operation

inverter to the motor are open

accelerate

Table 5.4 Mapping of Fault Codes

16 MG.14.C1.02 - VLT® is a registered Danfoss trademark

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

5.1.2 Binary Input- and Output Objects

Object_Name Present_Value
ID Default name Parameter Bit number Option
BI:0 Digital input Term 33 1660 0
BI:1 Digital input Term 32 1660 1
BI:2 Digital input Term 29 1660 2
BI:3 Digital input Term 27 1660 3
BI:4 Digital input Term 19 1660 4
BI:5 Digital input Term 18 1660 5
BI:6 Digital input Term 37 1660 6
BI:7 Digital input GPIO Term X30/2 1660 9 MCB 101
BI:8 Digital input GPIO Term X30/3 1660 8 MCB 101
BI:9 Digital input GPIO Term X30/4 1660 7 MCB 101
BI:10..BI:15 are reserved for P1660/x (MCB 115)

Table 5.5 Binary Inputs

Object_Name Present_Value
ID
BO:0 Digital Output Term 27 590 0 x x x
BO:1 Digital Output Term 29 590 1 x x x
BO:2 GPIO Output Term X30/6 590 2 x x x MCB 101
BO:3 GPIO Output Term X30/7 590 3 x x x MCB 101
BO:4 Relay 1 590 4 x x x
BO:5 Relay 2 590 5 x x x
BO:6 Option B Relay 1 Output 590 6 x x x MCB 105
BO:7 Option B Relay 2 Output 590 7 x x x MCB 105
BO:8 Option B Relay 3 Output 590 8 x x x MCB 105
BO:9..BO:39 are reserved for Output P590/x (MCB 115)

Default name Parameter Bit number Writeable Cmd.able Timeout Option

5 5

Table 5.6 Binary Outputs

MG.14.C1.02 - VLT® is a registered Danfoss trademark 17

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

Object_Name Present_Value
Default

ID

BV:0 Reserved for VFD profile

BV:1

BV:2

BV:3

55

BV:4

BV:5

BV:6
BV:7
BV:8
BV:9
BV:10
BV:11
BV:12
BV:13
BV:14
BV:15
BV:16
BV:17
BV:18
BV:19
BV:20
BV:21 Warning x x STW 7
BV:22 Trip x x STW 3
BV:23 Triplock STW 6
BV:24 Coasting CTW 3 x x x
BV:25 CW/CCW CTW 15 x x x
BV:26 Jog CTW 8 x x x
BV:27 Reset CTW 7 x x x

BV:28

BV:29
BV:30 Reverse STW 1

BV:31
BV:32 Bus control STW 9
BV:33 Running x x STW 11

BV:34

BV:35

name Writeable EEPROM Parameter

CTW=047c

+
RUN/STOP
Command x x
REF 1 / REF
2 Select x x Note 1 n/a x x x x
Fault Reset
Command x x CTW 7 x
RUN / STOP
Monitor x x STW 1
OK / FAULT
Monitor x x STW 3, 6, 7
HAND /
AUTO
Reference x x 16-95 1

Reserved for VFD profile

Reset KWh
Counter 1506 n/a x
Reset
Running
Hours
Counter 1507 n/a x

Speed =
reference STW 8

Ramp 1/
Ramp 2 CTW 9 x x
ECB Test
Mode 3110 0 MCO 104

Reversing

bit 15

Bit

Timeout Option

number Writeable Cmd.able EEPROM

6 reverse
15 x x x

18 MG.14.C1.02 - VLT® is a registered Danfoss trademark

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

Object_Name Present_Value
Default

ID

BV:36

BV:37

BV:38
BV:39
BV:40
BV:41
BV:42
BV:43
BV:44
BV:45

name Writeable EEPROM Parameter

ECB Drive
Mode 3110 1 MCO 104
ECB auto.
Bypass
Enable 3110 2 MCO 104
ECB Bypass
Mode 3110 3 MCO 104

Reserved for ECB (MCO 104) - 3110 bit 4..10

Bit
number Writeable Cmd.able EEPROM

Timeout Option

5.1.3 Multi-state Value Objects

5 5

Object_Name Present_Value
ID
MSV:0 Smart Logic Controller State 1638 n/a
MSV:1 Active Setup CTW 13 and 14 x x x

TimeoutDefault name Parameter Bit number Writeable Cmd.able

MG.14.C1.02 - VLT® is a registered Danfoss trademark 19

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

5.1.4 Real Time Clock Variable

The frequency converter has a built-in real-time clock. The
standard real-time clock has no battery backup function,
which will lead to a loss of time if the drive is un-powered.
Some BACnet Master's can be programmed to send out the
date and time as a Broadcast Telegram on a regular basis.
The BACnet Interface will update the real-time clock of the
drive if it receives the time synchronization telegram.

5.1 Feedback to Network

55

The BACnet option provides several output variables (nvo’s)
objects to the network, containing important -, motor- and
I/O feedback data. The BACnet option transmits bound
network variables only and sends feedback data when there
is a change in value.

Influence of the digital input terminals upon the Control
Mode, 8-50 Coasting Select to 8-56 Preset Reference Select
The influence of the digital input terminals upon control of
the frequency converter can be programmed in

8-50 Coasting Select to 8-56 Preset Reference Select.

8-01 Control Site
8-56 and Terminal 37, Safe Stop overrules any parameter.

overrules the settings in parameters 8-50 to

Each of the digital input signals can be programmed to logic
AND, logic OR, or to have no relation to the corresponding
bit in the control word. In this way a specific control
command i.e. stop / coast, can be initiated by the fieldbus
only, fieldbus AND Digital Input, or Fieldbus OR Digital input
terminal.

In order to control the frequency converter via BACnet,
8-50 Coasting Select must be set to either Bus [1], or to Logic
AND [2] and 8-01 Control Site must be set to Digital and ctrl.
word [0] or Controlword only [2].

5.2 BIBBs

ReadProperty Execute
WriteProperty Execute
DeviceCommunicationControl Execute
ReinitializeDevice Execute
I-Am Initiate
I-Have Initiate
TimeSynchronization Execute
Who-Has Execute
Who-Is Execute

20 MG.14.C1.02 - VLT® is a registered Danfoss trademark

BACnet Objects

VLT® HVAC Drive Native BACnet Operating Instructions

5.3.1 Object/Property Support Matrix

The following table summarises the Object Types and Properties supported:

Property Device

Object identifier X X X X X X X X
Object Name X X X X X X X X
Object Type X X X X X X X X
System Status X
Vendor Name X
Vendor Identifier X
Model Name X
Firmware Revision X
Appl. Software Revision X
Location X
Description X
Protocol Version X
Protocol Revision X
Services Supported X
Object List X
Max. APDU Length X
Segmentation Support X
Local Time X
Local Date X
APDU Timeout X
Number APDU Retries X
Max Master X
Max Info Frames X
Device Address Binding X
Database Revision X
Present Value X X X X X X X
Status Flags X X X X X X X
Event State X X X X X X X
Reliability X X X X X X X
Out-of-Service X X X X X X X
Number of States X
State Text X
Units X X X
Priority Array X X* X X* X*
Relinquish Default X X* X X* X*
Polarity X X
Active Text X X X
Inactive Text X X X
*For commandable values only

Binary

input

Binary

output

Binary

value

Analog

input

Analog
output

Analog

value

Multistage

value

5 5

MG.14.C1.02 - VLT® is a registered Danfoss trademark 21

Parameters

6 Parameters

6.1 Parameter Overview

6.1.1 Parameter List

VLT® HVAC Drive Native BACnet Operating Instructions

6

Parameter Default value Range

8-01 Control Site
8-02 Control Source
8-03 Control Timeout Time
8-04 Control Timeout Function
8-05 End-of-Timeout Function
8-06 Reset Control Timeout
8-07 Diagnosis Trigger
8-10 Control Profile
8-30 Protocol
8-31 Address
8-32 Baud Rate
8-33 Parity / Stop Bits
8-35 Minimum Response Delay
8-36 Maximum Response Delay
8-37 Maximum Inter-Char Delay
8-50 Coasting Select
8-52 DC Brake Select
8-53 Start Select
8-54 Reversing Select
8-55 Set-up Select
8-56 Preset Reference Select
8-70 BACnet Device Instance
8-72 MS/TP Max Masters
8-73 MS/TP Max Info Frames
8-74 "I-Am" Service
8-75 Initialisation Password

Dig. and ctrl. word [0] [0 - 2] - 5
Option A [0 - 4] - 5
1 s 0.1 - 18000 - 1 7
Off [0] [0 - 10] - 5
Hold set-up [0] [0 - 1] - 5
Do not reset [0] [0 - 1] - 5
Disable [0] [0 - 3] - 5
FC [0] [0 - x] - 5
FC
1 [0 – 255]
9600 [0 – 7]
No Parity, 1 Stop Bit
10mS
5000mS

25.00mS
Logic OR [3] [0 - 3] - 5
Logic OR [3] [0 - 3] - 5
Logic OR [3] [0 - 3] - 5
Logic OR [3] [0 - 3] - 5
Logic OR [3] [0 - 3] - 5
Logic OR [3] [0 - 3] - 5
1 [1-4194304] ­127 [1-127] -

Once at powerup [0] [0-1] ­“admin” String[19]

Conversion
index

Data
type

Table 6.1 BACnet Specific Parameter List

Please refer to the VLT® HVAC Drive Drive Operating Instructions, MG.11.Ax.yy for a comprehensive parameter list or to the VLT
HVAC Drive Drive Programming Guide, MG.11.Cx.yy for detailed descriptions of parameters.

Conversion index
This number refers to a conversion figure used when writing or reading to and from the frequency converter.

Conv.
index
Conv.
factor

22 MG.14.C1.02 - VLT® is a registered Danfoss trademark

100 67 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6

1 1/60 1000000 100000 10000 1000 100 10 1 0.1 0.01 0.001 0.0001 0.00001 0.000001

®

Parameters

Data type Description Type
2 Integer 8 Int8
3 Integer 16 Int16
4 Integer 32 Int32
5 Unsigned 8 Uint8
6 Unsigned 16 Uint16
7 Unsigned 32 Uint32
9 Visible String VisStr
33 Normalized value 2 bytes N2
35 Bit sequence of 16 boolean variables V2
54 Time difference w/o date TimD

See the frequency converter Design Guide for further information about data types 33, 35 and 54.

VLT® HVAC Drive Native BACnet Operating Instructions

6

6

MG.14.C1.02 - VLT® is a registered Danfoss trademark 23

Parameters

VLT® HVAC Drive Native BACnet Operating Instructions

6

6.2 Parameter Description

6.2.1 8-** Comm. and Options

8-01 Control Site

Option: Function:

The setting in this parameter overrides
the settings in 8-50 Coasting Select to
8-56 Preset Reference Select.

[0] * Digital and

ctrl.word

[1] Digital only Control by using digital inputs only.

[2] Controlword only Control by using control word only.

8-02 Control Source

Option: Function:

Select the source of the control word: one of two
serial interfaces or four installed options. During
initial power-up, the frequency converter automat­ically sets this parameter to Option A [3] if it
detects a valid fieldbus option installed in slot A. If
the option is removed, the frequency converter
detects a change in the configuration, sets
8-02 Control Source back to default setting FC Port,
and the frequency converter then trips. If an
option is installed after initial power-up, the
setting of 8-02 Control Source will not change but
the frequency converter will trip and display:
Alarm 67 Option Changed.

[0] None
[1] FC Port
[2] * USB Port
[3] Option A
[4] Option B

This parameter cannot be adjusted while the motor is
running.

8-03 Control Timeout Time

Range: Function:

0 s* [0.1 -

18000 s]

Enter the maximum time expected to pass
between the reception of two consecutive
telegrams. If this time is exceeded, it indicates that
the serial communication has stopped. The
function selected in 8-04 Control Timeout Function
will then be carried out.
In BACnet the following variables will trigger the
Control Word Time parameter:

Control by using both digital input and
control word.

Analog Outputs

Binary Outputs

AV0

AV1

AV2

8-03 Control Timeout Time

Range: Function:

AV4

BV1

BV2

BV3

BV4

BV5

Multistate Outputs

8-04 Control Timeout Function

Option: Function:

Select the time-out function. The time­out function is activated when the
control word fails to be updated within
the time period specified in
8-03 Control Timeout Time. Choice [20]
only appears after setting the Metasys
N2 protocol.

[0] * Off
[1] Freeze output
[2] Stop
[3] Jogging
[4] Max. speed
[5] Stop and trip
[7] Select setup 1
[8] Select setup 2
[9] Select setup 3
[10] Select setup 4
[20] N2 Override Release

8-05 End-of-Timeout Function

Option: Function:

Select the action after receiving a valid control
word following a time-out. This parameter is
active only when 8-04 Control Timeout Function
is set to [Set-up 1-4].

[0] Hold set-up

[1] * Resume set-upResumes the set-up active prior to the time-

Retains the set-up selected in 8-04 Control

Timeout Function and displays a warning, until
8-06 Reset Control Timeout toggles. Then the

frequency converter resumes its original set-up.

out.

8-06 Reset Control Timeout

Option: Function:

This parameter is active only when the choice Hold

set-up [0] has been selected in 8-05 End-of-Timeout
Function .

[0] * Do not

reset

Retains the set-up specified in 8-04 Control Timeout
Function, [Select setup 1-4] following a control
time-out.

24 MG.14.C1.02 - VLT® is a registered Danfoss trademark

Parameters

VLT® HVAC Drive Native BACnet Operating Instructions

8-06 Reset Control Timeout

Option: Function:

[1] Do reset Returns the frequency converter to the original

set-up following a control word time-out. When
the value is set to Do reset [1], the frequency
converter performs the reset and then
immediately reverts to the Do not reset [0] setting.

8-07 Diagnosis Trigger

Option: Function:

This parameter has no function for
BACnet.

[0] * Disable
[1] Trigger on alarms
[2] Trigger alarm/warn.

8-09 Communication Charset

Option: Function:

[0] * ISO 8859-1
[1] ANSI X3.4

8-30 Protocol

Option: Function:

[5] BACnet Communication according to the BACnet protocol as

described in FC 100 Native BACnet Operating
Instructions.

8-31 Address

Range: Function:

1. * [1. - 127. ] Sets the drives MAC ID on the MS/TP network.

8-32 Baud Rate

Option: Function:

Baud rate selection depends on Protocol
selection in 8-30 Protocol.

[2] 9600 Baud
[3] 19200 Baud
[4] * 38400 Baud
[6] 76800 Baud

Default refers to the FC Protocol.

8-33 Parity / Stop Bits

Option: Function:

Parity and Stop Bits for the protocol
8-30 Protocol using the FC Port. For
some of the protocols, not all options
will be visible. Default depends on
the protocol selected.

[0] * Even Parity, 1 Stop Bit
[1] Odd Parity, 1 Stop Bit
[2] No Parity, 1 Stop Bit
[3] No Parity, 2 Stop Bits

8-35 Minimum Response Delay

Range: Function:

Size related* [5. - 10000.

ms]

Specify the minimum delay time
between receiving a request and
transmitting a response. This is used
for overcoming modem turnaround
delays.

8-36 Maximum Response Delay

Range: Function:

Size related* [11. - 10001.

ms]

Specify the maximum permissible
delay time between transmitting a
request and receiving a response.
Exceeding this delay time will cause
control word time-out.

8-37 Maximum Inter-Char Delay

Range: Function:

Size related* [0.00 - 35.00

ms]

Specify the maximum permissible
time interval between receipt of two
bytes. This parameter activates time­out if transmission is interrupted.

8-50 Coasting Select

Option: Function:

Select control of the coasting function via the
terminals (digital input) and/or via the bus.

[0] Digital

input

[1] Bus Activates Start command via the serial

[2] Logic AND Activates Start command via the fieldbus/serial

[3] * Logic OR Activates Start command via the fieldbus/serial

Activates Start command via a digital input.

communication port or fieldbus option.

communication port, AND additionally via one
of the digital inputs.

communication port OR via one of the digital
inputs.

8-52 DC Brake Select

Option: Function:

Select control of the DC brake via the terminals
(digital input) and/or via the fieldbus.

[0] Digital

input

[1] Bus Activates Start command via the serial

[2] Logic AND Activates Start command via the fieldbus/serial

[3] * Logic OR Activates Start command via the fieldbus/serial

Activates Start command via a digital input.

communication port or fieldbus option.

communication port, AND additionally via one
of the digital inputs.

communication port OR via one of the digital
inputs.

6

6

MG.14.C1.02 - VLT® is a registered Danfoss trademark 25

Parameters

VLT® HVAC Drive Native BACnet Operating Instructions

6

8-53 Start Select

Option: Function:

Select control of the frequency converter start
function via the terminals (digital input) and/or
via the fieldbus.

[0] Digital

input

[1] Bus Activates Start command via the serial

[2] Logic AND Activates Start command via the fieldbus/serial

[3] * Logic OR Activates Start command via the fieldbus/serial

Activates Start command via a digital input.

communication port or fieldbus option.

communication port, AND additionally via one
of the digital inputs.

communication port OR via one of the digital
inputs.

8-54 Reversing Select

Option: Function:

Select control of the frequency converter reverse
function via the terminals (digital input) and/or
via the fieldbus.

[0] * Digital

input

[1] Bus Activates Reverse command via the serial

[2] Logic AND Activates Reverse command via the fieldbus/

[3] Logic OR Activates Reverse command via the fieldbus/

Activates Reverse command via a digital input.

communication port or fieldbus option.

serial communication port, AND additionally via
one of the digital inputs.

serial communication port OR via one of the
digital inputs.

NOTE

This parameter is active only when 8-01 Control Site is set to
[0] Digital and control word.

8-56 Preset Reference Select

Option: Function:

Select control of the frequency converter Preset
Reference selection via the terminals (digital
input) and/or via the fieldbus.

[0] Digital

input

[1] Bus Activates Preset Reference selection via the

[2] Logic AND Activates Preset Reference selection via the

[3] * Logic OR Activates the Preset Reference selection via the

Activates Preset Reference selection via a digital
input.

serial communication port or fieldbus option.

fieldbus/serial communication port, AND
additionally via one of the digital inputs.

fieldbus/serial communication port OR via one
of the digital inputs.

8-70 BACnet Device Instance

Range: Function:

0 - 4194302 The Device Instance number must be unique

for the complete BACnet, not only for this
MS/TP Branch.

1 * [0 - 4194302 ] Enter a unique ID number for the BACnet

device.

8-72 MS/TP Max Masters

Option: Function:

0 - 127 Define the address of the master which holds the

highest address in this network. Decreasing this value
optimises polling for the token.

8-73 MS/TP Max Info Frames

Range: Function:

1 - 65534 Define how many info/data frames the device is

allowed to send while holding the token.

1* [1 - 65534 ] Define how many info/data frames the device is

allowed to send while holding the token.

8-55 Set-up Select

Option: Function:

Select control of the frequency converter set-up
selection via the terminals (digital input) and/or
via the fieldbus.

[0] Digital

input

[1] Bus Activates the set-up selection via the serial

[2] Logic AND Activates the set-up selection via the fieldbus/

[3] * Logic OR Activate the set-up selection via the fieldbus/

26 MG.14.C1.02 - VLT® is a registered Danfoss trademark

Activates the set-up selection via a digital input.

communication port or fieldbus option.

serial communication port, AND additionally via
one of the digital inputs.

serial communication port OR via one of the
digital inputs.

8-74 "I-Am" Service

Option: Function:

[0] * Send at power-

up

[1] Continuously Choose whether the device should send

8-75 Initialisation Password

Range: Function:

[Size
related]
0 * [0 - 0] Enter the password needed for execution of

0 - 0 Enter the password needed for execution of

Drive Re-initialisation from BACnet.

Drive Re-initialisation from BACnet.

the "I-Am" service message only at power­up or continuously with an interval of
approx. 1 min.

Troubleshooting

VLT® HVAC Drive Native BACnet Operating Instructions

7 Troubleshooting

7.1 Alarm, Warning and Extended Status
Word

7.1.1 Alarm and Warning Messages

General
There is a clear distinction between alarms and warnings. In
the event of an alarm, the frequency converter will enter a
fault condition. After the cause for the alarm has been
cleared, the master must acknowledge the alarm message in
order to start operation of the frequency converter again. A
warning, on the other hand, may appear when a warning
condition arises, then disappear when conditions return to
normal without interfering with the process.

Alarm Word and Warning Word are shown on the display in
Hex format. If there is more than one warning or alarm, a
sum of all warnings or alarms will be shown. Warning Word
and Alarm Word are displayed in par. 16-90 to 16-95. For
more information on the individual alarms and warnings,
please refer to: VLT® HVAC Drive Design Guide.

Warnings
All warnings within the frequency converter are represented
by a single bit within a Warning Word. A Warning Word is
always an action parameter. Bit status FALSE [0] means no
warning, while bit status TRUE [1] means warning. Each bit
status has a corresponding text string message. In addition
to the Warning Word message the master will also be
notified via a change to bit 7 in the status word.

Alarms
Following an alarm message the frequency converter will
enter a fault condition. Only after the fault has been rectified
and the master has acknowledged the alarm message by
setting bit 3 in the Control Word, can the FC resume
operation. All alarms within the FC are represented by a
single bit within an Alarm Word. An Alarm Word is always an
action parameter. Bit status FALSE [0] means no alarm, while
bit status TRUE [1] means alarm.

7 7

MG.14.C1.02 - VLT® is a registered Danfoss trademark 27

Troubleshooting

7.1.2 Alarm Words

VLT® HVAC Drive Native BACnet Operating Instructions

16-90 Alarm Word

Bit

(Hex)
00000001 Brake check
00000002 Power card over temperature
00000004 Earth fault
00000008 Ctrl. card over temperature
00000010 Control word timeout
00000020 Over current
00000040 Torque limit
00000080 Motor thermistor over temp.
00000100 Motor ETR over temperature
00000200 Inverter overloaded
00000400 DC link under voltage

77

00000800 DC link over voltage
00001000 Short circuit
00002000 Inrush fault
00004000 Mains phase loss
00008000 AMA not OK
00010000 Live zero error
00020000 Internal fault
00040000 Brake overload
00080000 Motor phase U is missing
00100000 Motor phase V is missing
00200000 Motor phase W is missing
00400000 Fieldbus fault
00800000 24V supply fault
01000000 Mains failure
02000000 1.8V supply fault
04000000 Brake resistor short circuit
08000000 Brake chopper fault
10000000 Option change
20000000 Drive initialised
40000000 Safe Stop
80000000 Not used

Alarm Word
(16-90 Alarm Word)

16-91 Alarm Word 2

Bit

(Hex)
00000001 Service Trip, read / Write
00000002 Reserved
00000004 Service Trip, Typecode / Sparepart
00000008 Reserved
00000010 Reserved
00000020 No Flow
00000040 Dry Pump
00000080 End of Curve
00000100 Broken Belt
00000200 Not used
00000400 Not used
00000800 Reserved
00001000 Reserved
00002000 Reserved
00004000 Reserved
00008000 Reserved
00010000 Reserved
00020000 Not used
00040000 Fans error
00080000 ECB error
00100000 Reserved
00200000 Reserved
00400000 Reserved
00800000 Reserved
01000000 Reserved
02000000 Reserved
04000000 Reserved
08000000 Reserved
10000000 Reserved
20000000 Reserved
40000000 Reserved
80000000 Reserved

Alarm Word 2
(16-91 Alarm Word 2)

28 MG.14.C1.02 - VLT® is a registered Danfoss trademark

Troubleshooting

7.1.3 Warning Words

VLT® HVAC Drive Native BACnet Operating Instructions

16-92 Warning Word

Bit

(Hex)
00000001 Brake check
00000002 Power card over temperature
00000004 Earth fault
00000008 Ctrl. card over temperature
00000010 Control word timeout
00000020 Over current
00000040 Torque limit
00000080 Motor thermistor over temp.
00000100 Motor ETR over temperature
00000200 Inverter overloaded
00000400 DC link under voltage
00000800 DC link over voltage
00001000 DC link voltage low
00002000 DC link voltage high
00004000 Mains phase loss
00008000 No motor
00010000 Live zero error
00020000 10V low
00040000 Brake resistor power limit
00080000 Brake resistor short circuit
00100000 Brake chopper fault
00200000 Speed limit
00400000 Fieldbus comm. fault
00800000 24V supply fault
01000000 Mains failure
02000000 Current limit
04000000 Low temperature
08000000 Voltage limit
10000000 Encoder loss
20000000 Output frequency limit
40000000 Not used
80000000 Not used

Warning Word
(16-92 Warning Word)

16-93 Warning Word 2

Bit

(Hex)
00000001 Start Delayed
00000002 Stop Delayed
00000004 Clock Failure
00000008 Reserved
00000010 Reserved
00000020 No Flow
00000040 Dry Pump
00000080 End of Curve
00000100 Broken Belt
00000200 Not used
00000400 Reserved
00000800 Reserved
00001000 Reserved
00002000 Reserved
00004000 Reserved
00008000 Reserved
00010000 Reserved
00020000 Not used
00040000 Fans warning
00080000 ECB warning
00100000 Reserved
00200000 Reserved
00400000 Reserved
00800000 Reserved
01000000 Reserved
02000000 Reserved
04000000 Reserved
08000000 Reserved
10000000 Reserved
20000000 Reserved
40000000 Reserved
80000000 Reserved

Warning Word 2
(16-93 Warning Word 2)

7 7

MG.14.C1.02 - VLT® is a registered Danfoss trademark 29

www.danfoss.com/drives

130R0235 MG14C102 Rev. 2010-08-31

*MG14C102*