Danfoss VLT HVAC Drive Metasys N2 User manual

Contents
Introduction 3
About this Manual 3
References 3
Abbreviations and Definitions 5
Network Connection 5
Hardware Set-up 5
VLT Parameters 7
Analog Inputs (AI) 23
Binary Inputs (BI) 24
Analog Outputs (AO) 28
Binary Outputs (BO) 29
Internal Floating Point (ADF) 30
Internal Integers (ADI) 33
Index
35
VLT
®
HVAC Drive Metasys N2 Contents
MG.11.G1.02 - VLT®is a registered Danfoss trademark 1

1. Overview VLT
®
HVAC Drive Metasys N2
2 MG.11.G1.02 - VLT®is a registered Danfoss trademark
1

1.1.1. Introduction
The frequency converter control board is program selectable for use with the Johnson controls
Metasys N2 protocol. Metasys N2 is a master/slave control network. The physical layer is RS-485
compatible, half duplex 9600 baud shielded twisted pair. The N2 software protocol is designed to
be general in nature to accommodate the unique properties each device type may have. Every
device connection to the N2 network can be thought of as a small data manager. Data points in
the database are classified as analog I/O (floating point), binary I/O or integer data points - floats,
integers or bytes. Each data type has its own unique structure defined in the Metasys N2 system
Protocol Specification for Vendors.
The information in this manual is intended to provide you with comprehensive information on how
to install and set up the frequency converter for communication over a Metasys network.
For specific information on operation of the drive, refer to the
VLT
®
HVAC Drive Operating In-
structions, MG.11.Ax.yy.
1.1.2. About this Manual
This manual is for both instructional and for reference purposes. This manual can also serve as a
guideline when you specify and optimize your communication system.
It is highly recommended that you read this manual in its entirety before initiating any program-
ming. It is assumed that the user has full knowledge of the capabilities and limitation of the
controller node in addition to full knowledge of the frequency converter.
1.1.3. References
In addition to this manual, the following two manuals should be consulted: VLT
®
HVAC Drive
Operating Instruction, MG.11.Ax.yy
and Johnson Controls METASYS N2 System Protocol Specifi-
cation for Vendors, Johnson Controls number 04-3402-22, rev A
.
VLT
®
HVAC Drive Metasys N2 1. Overview
MG.11.G1.02 - VLT®is a registered Danfoss trademark 3
1

2. Instructions VLT
®
HVAC Drive Metasys N2
4 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

2.1.1. Abbreviations and Definitions
Abbreviations and definitions
ACK Acknowledge
ADF Internal Floating Points
ADI Internal Integers
AI Analog Inputs
AO Analog Outputs
BI Binary Inputs
BO Binary Outputs
COS Change Of State
HPFB High Performance Field Bus
JCI Johnson Controls Inc. developers of the METASYS N2 protocol
N2 METASYS N2
N2 master A N2 master is either a PC with JCI software or a dedicated JCI controller
NAK Not acknowledged
NPA N2 Point Address (Each N2 Point Type has a address range from 0 to 255)
NPT N2 Point Type
PAR Parameter Number
2.1.2. Network Connection
Connect signal wires to terminal 68 (N+) and terminal 69 (N-) on main control board of the drive.
If shielded cabling is used, connect one end of the shield to terminal 61. This terminal is connected
to ground via an internal RC link. It is highly recommended to use twisted-pair cables to reduce
the differential mode interference between the conductors
Torque Specifications: 4.5 in.lb. (0.5 Nm)
Control wire: 18 - 24 AWG, shielded, twisted pair
2.1.3. Hardware Set-up
RS 485 Bus Connection:
One or more frequency converters can be connected to a control (or master) using the RS485
standardized interface. Terminal 68 is connected to the P signal (TX+, RX+), while terminal 69 is
connected to the N signal (TX-,RX-). If more than one frequency converter is connected to a
master, use parallel connections.
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 5
2

Illustration 2.1: Bus termination switch
In order to avoid potential equalizing currents in the screen, earth the cable screen via terminal
61, which is connected to the frame via an RC-link.
Bus termination: The RS485 bus must be terminated by a resistor network at both ends. For this
purpose, set switch S801 on the control card to "ON". For more information, see the paragraph:
Switches S201, S202 and S801.
NB!
Communication protocol must be set to FC MC par. 8-30.
2. Instructions VLT
®
HVAC Drive Metasys N2
6 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

2.1.4. Error Codes
Error codes
Error Code 00 is issued after power up or after a time out where all overridden points
were released, as long as no Identify yourself command has been issued
by the master.
Error Code 01 is issued if the command is not supported or not known by the drive.
Error Code 02 is issued if the received telegram has a checksum error.
Error Code 03 is issued if the N2 telegram receive buffer exceeds 256 characters.
Error Code 05 is issued if the received N2 telegram is too long.
Error Code 10 is issued the data is out of expected range
Error Code 11 is issued when:
1. A point attributes or attribute bit is unused.
2. A point attributes or attribute bit is for JCI use only.
3. An internal data point attribute for current value can not be changed
while running
Error Code 12 is issued when:
1. The N2 master tries to change attribute 2 bit 6 "Current State" on a BO
and the drive is tripped.
2. The N2 master tries to change attribute 2 bit 6 "Current State" on a BO
and the drive is trip locked except for BO 5 "reset"
2.1.5. VLT Parameters
The following parameters may need to be manually set for each drive in the Metasys N2 network.
Refer to the Installation, Operation and Maintenance Manual for the frequency converter for pro-
gramming.
Parameter list
FC PARAMETER DESCRIPTION DEFAULT DESIRED SETTING
8-01 Control side Digital & Ctrl. Word
8-02 Control source FC Port FC Port
8-03 Control word timeout 60 s 1-18000 s
8-30 Protocol FC Metasys N2
8-31 Address 11-255
8-32 Baud rate 9600 Fixed to 9600
8-33 Parity Even, 1stop Fixed to No Parity, 1stop
8-37 Max Inter-char delay 25 s for Metasys N2
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 7
2

2.1.6. General Commands (Acknowledged)
VLT Re-
sponse Com- mand Subcom- mand NPA Ob- ject no. Attribute Mes- sage Type Error Code Comments
ACK 0 4 - Poll Message
No Acknowledge -The slave is to respond with any
data points, analog or binary I/O
that have been flagged for COS
ACK 0 5 - Poll message
With Acknowledge -The slave is to respond with any
data points, analog or binary I/O
that have been flagged for COS
ACK 0 9 - Status update Mes-
sage -
Slave device must respond with de-
vice manufacturing model number
(Par. 621), days in service (Par.
600) and device status
ACK F - - Identify Device
Type -Slave device responds with an iden-
tification number of 10H to indicate
non JCI device
ACK 0 0 - Synch Time -The internal clock is syncronized by
this command
ACK, no ac-
tion 80- Upload -
Optional, no support in the fre-
quency converter
ACK, no ac-
tion 8 1 - Upload -Optional, no support in the fre- quency converter
ACK, no ac-
tion 8 3 - Upload Record - Optional, no support in the fre-
quency converter
ACK, no ac-
tion 8 4 - Upload Complete -Optional, no support in the fre- quency converter
ACK, no ac-
tion 90-Download-
Optional, no support in the fre-
quency converter
ACK, no ac-
tion 9 1 - Download -Optional, no support in the fre- quency converter
ACK, no ac-
tion 93-Download-
Record optional, no support in the
frequency converter
ACK, no ac-
tion 9 4 - Download Complete -Optional, no support in the fre- quency converter
NAK 0 1 - Read Memory 01 Slave device memory read based
on memory addresses
NAK 0 8 - Warm Start 01 JCI use only
Table 2.1: No Region, Attribute Number and -type in this table.
2. Instructions VLT
®
HVAC Drive Metasys N2
8 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

2.1.7. Analog Input Commands (Acknowledged)
VLT Re-
sponse Com- mand
Sub-
com-
mand
Re-
gion NPA Object no. Attrib- ute No. Attribute Message Type Comments
ACK 1 - 1 0-23 1Byte Read Analog
Input
Read Object Configura-
tion attribute associ-
ated with each individ-
ual point
ACK 1 - 1 0-23 2Byte Read Analog
Input
1) Read Object Status
attribute associated
with each individual
point
ACK 1 - 1 0-23 3Float Read Analog
Input
2) Read Analog Input
Value attribute associ-
ated with each individ-
ual point
ACK 1 - 1 0-23 8Float Read Analog
Input
Read Low Alarm attrib-
ute associated with
each individual point
ACK 1 - 1 0-23 9Float Read Analog
Input
Read Low Warning at-
tribute associated with
each individual point
ACK 1 - 1 0-23 10 Float Read Analog
Input
Read High Warning at-
tribute associated with
each individual point
ACK 1 - 1 0-23 11 Float Read Analog
Input
Read High Alarm attrib-
ute associated with
each individual point
ACK 1 - 1 0-23 12 Float Read Analog
Input
Read Differential attrib-
ute associated with
each individual point
ACK 2 - 1 0-23 1Byte Write Analog
Input
Write to Object Config-
uration attribute associ-
ated with each individ-
ual point
ACK 2 - 1 0-23 8Float Write Analog
Input
Write toLow Alarm Lim-
it attribute associated
with each individual
point
ACK 2 - 1 0-23 9Float Write Analog
Input
Write to Low Warning
Limit attribute associ-
ated with each individ-
ual point
ACK 2 - 1 0-23 10 Float Write Analog
Input
Write to High Warning
Limitattribute associ-
ated with each individ-
ual point
ACK 2 - 1 0-23 11 Float Write Analog
Input
Write to High Alarm
Limit attribute associ-
ated with each individ-
ual point
ACK 2 - 1 0-23 12 Float Write Analog
Input
Write to Differential at-
tribute associated with
each individual point
ACK, no ac-
tion 7 2 1 0-23 -Float Override Ana- log inputs
Analog inputs are "out-
puts" from the frequen-
cy converter and should
not be written over by
the network controller
ACK, no ac-
tion 7 3 1 0-23 - - Override Ana- log Release
Analog inputs are "out-
puts" from the frequen-
cy converter and should
not be written over by
the network controller
ACK, no ac-
tion 7 7 1 0-23 - - Write Analog Input Attributes
Optional command for
slave devices. Only
used for N2 commis-
sioning purposes
Table 2.2: No Error code in this table.
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 9
2

2.1.8. Analog Input Commands (Not Acknowledged)
VLT
Re-
sponse
Com
man
d
Re-
gio
n
NPA Ob-
ject no. Attribu- te No. Attribute Mes- sage Type Er- ror
Cod
e
Comments
NAK 1 1 0-23 4Float Read Ana-
log Input 11
1 )
Read Linear Ranging
Parameter 1 attrib-
ute associated with
each individual
point. (JCI use only)
NAK 1 1 0-23 5Float Read Ana-
log Input 11
1)
Read Linear Ranging
Parameter 2 attrib-
ute associated with
each individual
point. (JCI use only)
NAK 2 - 0-23 2Byte Write Ana-
log Input 11
1)
Object Status write-
able
NAK 2 - 0-23 3Float Write Ana-
log Input 11
1)
Analog Input Value
not writeable
NAK 2 - 0-23 4Float Write Ana-
log Input 11
1)
Write to Linear
Ranging Parameter
1 attribute associ-
ated with each indi-
vidual point. (JCI use
only)
NAK 2 - 0-23 5Float Write Ana-
log Input 11
1)
Write to Linear
Ranging Parameter
2 attribute associ-
ated with each indi-
vidual point. (JCI use
only)
NAK 2 - 0-23 6Float Write Ana-
log Input 11
1)
Write to Linear
Ranging Parameter
3 attribute associ-
ated with each indi-
vidual point. (JCI use
only)
NAK 2 - 0-23 7Float Write Ana-
log Input 11
1)
Write to Linear
Ranging Parameter
4 attribute associ-
ated with each indi-
vidual point. (JCI use
only)
NAK 2 - 0-23 13 Inte-
ger Write Ana- log Input 11
1)
Write to Filter
Weight attribute as-
sociated with each
individual point. (JCI
use only)
NAK 2 - 0-23 14 Float Write Ana-
log Input 11
1)
Write to AI Offset at-
tribute associated
with each individual
point. (JCI use only)
1)
Error code 11 is used because attributes are considered as fields/records in the point map
database.
Table 2.3: No Subcommand coloumn in this table.
2. Instructions VLT
®
HVAC Drive Metasys N2
10 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

2.1.9. Analog Output Commands (Acknowledged)
VLT
Re-
sponse
Com-
man
d
Sub
com-
mand
Re-
gio
n
NPA Ob-
ject no. Attrib- ute No. Attribute Mes- sage Type Comments
ACK 1 - 3 0-2 1Byte Read Ana-
log Output Read Object Config- uration attribute as-
sociated with each
individual point
ACK 1 - 3 0-2 2Byte Read Ana-
log Output Read Object Status attribute associated
with each individual
point
ACK 0 9 - - - - Status up-
date Mes-
sage
Slave device must
respond with device
manufacturing mod-
el number (Par.
621), days in service
(Par. 600) and de-
vice status
ACK 1 - 3 0-2 3Float Read Ana-
log Output Read Current Value attribute associated
with each individual
point
ACK 2 - 3 0-2 1Byte Write Ana-
log Output Write to Object Con- figuration attribute
associated with each
individual point
ACK 7 2 3 0-2 -Float Override
Analog Out-
put
Write to analog out-
put current value
(frequency setpoint)
ACK 7 2 3 0-2 -Float Override
Analog Out-
put
Write to analog out-
put current value
(frequency setpoint)
ACK 7 3 3 0-2 - - Override
Release Set the current val- ue, the value that it
was before the 1.
Override Command
was issued
ACK, no
action 7 7 3 0-2 - - Write Ana- log Output Optional command for slave devices.
Only used for N2 At-
tributes commis-
sioning purposes.
Not to be implemen-
ted at this time
ACK, no
action 7 8 3 0-2 - - Read Ana- log Output
Attributes
Optional command
for no action slave
devices. Only used
for N2 commission-
ing purposes. Not to
be implemented at
this time
Table 2.4: No Error Code coloumn in this table.
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 11
2

2.1.10. Analog Output Commands (Not Acknowledged)
VLT
Re-
sponse
Com-
mand Re- gion NPA Ob- ject no. Attrib- ute No. Attribute Message Type Error Code Comments
0-2 1 3 0-2 4Float Read Ana-
log Output 11
1
Read Low Linear
Ranging Parameter
attribute associated
with each nindividual
point. (JCI use only)
NAK 1 3 0-2 5Float Read Ana-
log Output 11
1
Read High Linear
Ranging Parameter
attribute associated
with each individual
point. (JCI use only)
NAK 2 3 0-2 2Byte Write Ana-
log Output 11
1
Object Status not
writeable
NAK 2 3 0-2 3Float Write Ana-
log Output 11
1
Write to Current Val-
ue structure attrib-
utes associated with
each individual point.
(N2 does not support
this, override func-
tion must be used)
NAK 2 3 0-2 4Float Write Ana-
log Output 11
1
Write Debouncing
Value in msec attrib-
ute associated with
each individual point.
(JCI use only)
NAK 2 3 0-2 5Float Write Ana-
log Output 11
1
Write Accumulator
value attribute asso-
ciated with each indi-
vidual point. (JCI use
only)
1)
Error code 11 is used because attributes are considered as fields/records in the point map
database.
Table 2.5: No Subcommand coloumn in this table.
2. Instructions VLT
®
HVAC Drive Metasys N2
12 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

2.1.11. Binary Input (BI) Commands (Acknowledged)
VLT
Re-
sponse
Com-
mand Sub- com-
mand
Re-
gion NPA Ob- ject no. Attribute No. Attribute Mes- sage Type Comments
ACK 1 - 2 0-135 1Byte Read Bi-
nary In-
put
Read Object Con-
figuration attribute
associated with
each individual
point
ACK 1 - 2 0-135 2Byte Read Bi-
nary In-
put
Read Object Status
attribute associ-
ated with each in-
dividual point
ACK 2 - 2 0-135 1Byte Write Bi-
nary In-
put
Write to Object
Configuration at-
tribute associated
with each individu-
al point
ACK, no
action 7 2 2 0-135 -Byte( 0/1) Override Binary In-
put
Binary inputs are
"outputs" from the
frequency convert-
er and should not
be written over by
the network con-
troller. (Status
word, Warnings,
and Alarms)
ACK, no
action 7 3 2 0-135 - - Overri- deRelease Binary inputs are "outputs" from the
drive and should
not be written over
by the network
controller. (Status
word, Warnings
and Alarms)
ACK, no
action 7 7 2 0-135 - - Write Bi- nary In-
put
Optional command
for slave devices.
Only Attributes
used for N2 com-
missioning purpo-
ses. Not to be im-
plemented at this
time
ACK, no
action 7 8 2 0-135 - - Read Bi- nary In-
put
Optional command
for Attributes slave
devices. Only used
for N2 commission-
ing purposes. Not
to be implemented
at this time
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 13
2

2.1.12. Binary Input (BI) Commands (Not Acknowledged)
VLT
Re-
sponse
Com-
mand Re- gion NPA Ob- ject no. Attribute No. Attribute Mes- sage Type Error Code Comments
NAK 2 2 0-135 2Byte Write Bi-
nary In-
put
11
1
Object Status not
writeable
NAK 2 2 0-135 3Inte-
ger Write Bi- nary In-
put
11
1
Write Debouncing
Value in msec attrib-
ute associated with
each individual point.
(JCI use only)
NAK 2 2 0-135 4Inte-
ger3
2
Write Bi-
nary In-
put
11
1
Write Accumulator
value attribute asso-
ciated with each indi-
vidual point (JCI use
only)
Table 2.6: No Subcommand coloumn in this table.
2. Instructions VLT
®
HVAC Drive Metasys N2
14 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

2.1.13. Binary Output Commands (Acknowledged)
VLT
Response Com- mand Subcom- mand Re- gion NPA Ob- ject no. Attribute No. Attribute Message Type Comments
ACK 1 - 4 0-10 1Byte Read Binary
Output Read structure attributes associated with each indi-
vidual point
ACK 1 - 4 0-10 2Byte Read Binary
Output Read structure attributes associated with each indi-
vidual point
ACK 2 - 4 0-10 1Byte Write Binary
Output Write to Object Configu- ration attribute associ-
ated with each individual
point
ACK 7 2 4 0-10 -Byte(0/
1) Override Binary Output Write to binary output current state (VLT control
word)
ACK 7 2 4 0-10 -Byte(0/
1) Override Binary Output Write to binary output current state (VLT control
word)
ACK 7 3 4 0-10 - - Override Re-
lease Set the current value, the value that it was before
the 1. Override Command
was issued
ACK, no
action 1 - 4 0-10 3Integer Read Binary Output Read Minimum On-time attribute associated with
each individual point. Re-
turn value = 0
ACK, no
action 1 - 4 0-10 4Integer Read Binary Output Read Minimum Off-time attribute associated with
each individual point. Re-
turn value = 0
ACK, no
action 1 - 4 0-10 5Integer Read Binary Output Read Maximum Cycles/ Hour attribute associated
with each individual
point. Return value = 0
ACK, no
action 2 - 4 0-10 3Integer Write Binary Output Write Minimum On-time attribute associated with
each individual point
ACK, no
action 2 - 4 0-10 4Integer Write Binary Output Write Minimum Off-time attribute associated with
each individual point
ACK, no
action 2 - 4 0-10 5Integer Write Binary Output Write Maximum Cycles/ Hour attribute associated
with each individual point
ACK, no
action 7 7 4 0-10 - - Write Binary Output Optional command for slave devices. Only Attrib-
utes used for N2 commis-
sioning purposes
ACK, no
action 7 8 4 0-10 - - Read Binary Output Optional command for slave devices. Only Attrib-
utes used for N2 commis-
sioning purposes
Table 2.7: No Error Code coloumn in this table.
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 15
2

2.1.14. Binary Output (BO) Commands (Not Acknowledged)
VLT
Re-
sponse
Com-
mand Re- gion NPA Ob- ject no. Attribute No. Attribute Mes- sage Type Error Code Comments
NAK 1 4 0-10 6In-
te-
ger
Read Bi-
nary Out-
put
11
1)
Read Interstage on
delay attribute asso-
ciated with each in-
dividual point. (JCI
use only)
NAK 1 4 0-10 7In-
te-
ger
Read Bi-
nary Out-
put
11
1)
Read Interstage off
delay attribute asso-
ciated with each in-
dividual point. (JCI
use only)
NAK 2 4 0-10 2Byte Write Bi-
nary Out-
put
11
1)
Object Status not
writeable
NAK 2 4 0-10 6In-
te-
ger
Write Bi-
nary Out-
put
11
1)
Write Interstage on
delay attribute asso-
ciated with each in-
dividual point. (JCI
use only)
NAK 2 4 0-10 7In-
te-
ger
Write Bi-
nary Out-
put
11
1)
Write Interstage off
delay attribute asso-
ciated with each in-
dividual point. (JCI
use only)
1)
Error code 11 is used because attributes are considered as fields/records in the point map
database.
Table 2.8: No Subcommand coloumn in this table.
2.1.15. Internal Integers (ADI) Commands (Acknowledged)
VLT
Response Command Subcom- mand Region NPA Object no. Attribute No. Attribute Message Type Comments
ACK 1 - 6 0-254 1Inte-
ger Read Internal Parameter of
object type in-
teger (16 bit)
Read Object Status
associated with each
individual point
ACK 1 - 6 0-254 2Inte-
ger Read Internal Parameter of
object type in-
teger (16bit)
Read Current Value
attribute associated
with each individual
point
ACK 2 - 6 0-254 -Inte-
ger Write Internal Parameter of
object type in-
teger (16bit)
Write to Current Value
attribute associated
with each individual
point
ACK 7 2 6 0-254 -Inte-
ger Override In- ternal Param-
eter of object
type Integer
(16 bit)
Write to internal pa-
rameter current value
(set-up parameters
for VLT)
ACK 7 3 6 0-254 - - Override Re-
lease Set the current value, the value that it was
before the 1. Override
Command was issued
Table 2.9: No Error Code coloumn in this table.
2. Instructions VLT
®
HVAC Drive Metasys N2
16 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

2.1.16. Internal Floating Point Commands (Acknowledged)
VLT
Response Command Subcom- mand Re- gion NPA Object no. Attribute No. Attribute Message Type Comments
ACK 1 - 5 0-101 1Byte Read Internal
Parameter of
object type
float
Read Object Status
associated with each
individual point
ACK 1 - 5 0-101 2Float Read Internal
Parameter of
object type
float
Read Current Value
attribute associated
with each individual
point
ACK 2 - 5 0-101 -Float Write Internal
Parameter of
object type
float
Write to Current Val-
ue attribute associ-
ated with each indi-
vidual point
ACK 2 - 5 0-101 -Float Write Internal
Parameter of
object type
float
Write to Current Val-
ue attribute associ-
ated with each indi-
vidual point
ACK 7 2 5 0-101 -Float Override Inter-
nal Parameter
of object type
float
Write to internal pa-
rameter current val-
ue (set-up parame-
ters for VLT)
ACK 7 3 5 0-101 - - Override Re-
lease Set the current value, the value that it was
before the 1. Over-
ride Command was
issued
Table 2.10: No Error Code coloumn in this table.
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 17
2

2.2.1. Start-up of the Frequency Converter
Use the frequency converter keypad mounted either on the drive or remote. Use the Extended
Menu key to access the 8-00 group parameters (serial communication). The settings shown below
are typical. Some settings may be changed to meet the application requirements. The settings
below will serve as a good starting reference. Refer to the operating instruction manual for in-
structions on changing parameters and programming the drive.
Examples of typical settings. Program
the following:
Parameter: Setting:
Parameter 8-30 Protocol [3] Metasys N2
Parameter 8-31 Address 1 (Default)
Parameter 8-32 FC Port Baudrate [2] 9600 Baud (fixed at 9600 for N2 protocol)
Parameter 8-50 Coasting Select [3] Logic OR
Parameter 8-52 DC brake Select [3] Logic OR
Parameter 8-53 Start Select [3] Logic OR
Parameter 8-54 Reversing Select [0] Digital input
Parameter 8-55 Set-up Select [3] Logic OR
Parameter 8-56 Preset Reference Select [3] Logic OR
Parameter 8-94 Bus Feedback 1 0
Parameter 8-95 Bus Feedback 2 0
NB!
Send an F command to begin communications between the master and the drive!
Example 1:
F command Setting:
Device address XX
Char1 command F
Checksum YY
Telegram code:
>XXFYY <CR> Issue a run command through the master, to the device:
Example 2:
Bus start, BO override command: Setting:
Device address XX
Char1 command 7
Char1 subcommand 2
Char2 region 04
Char2 object number (NPA) 04 (Start)
Char2 override value 01 (Active)
Checksum YY
Telegram code:
>XX72040401YY <CR> Issue a frequency reference through the mas- ter, to the device:
2. Instructions VLT
®
HVAC Drive Metasys N2
18 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2

Example 3:
Over-ride analog output, speed (50%)
change command: Setting:
Device address XX
Char1 command 7
Char1 subcommand 2
Char2 region 03
Char2 object number (NPA) 00
Char8 override value * 4E 00 00 00 override value = 50% speed (IEEE
floating point, format)
Checksum YY
Telegram code:
>XX7203004E000000<CR> To calculate override value for speed: refer to Scaling of Bus Reference and Bus Feedback.
Issue an override release command through
the master to the device:
Example 4:
Bus stop, BO over-ride release com-
mand: Setting:
Device address XX
Char1 command 7
Char1 subcommand 2
Char2 region 04
Char2 object number (NPA) 04 (Start)
Char8 override value * 00 (Not active)
Checksum Y
Telegram code:
>XX72040400YY <CR> If the preceding commands were issued, the drive should have accelerated to 50% after
the speed reference was issued. After the
override release, the drive should have stop-
ped.
2.2.2. Scaling of Bus Reference and Feedback
Reference/feedback Scaling Float IEEX hex
20% 20 * 16384/100 3276.8 454C CCCD
50% 50 * 16384/100 8192 4600 0000
100% 100 * 16384/100 16384 4680 0000
200% 200 * 16384/100 32767 46FF FE00
-100% -100 * 16384/100 -16384 C680 0000
-200% -200 * 16384/100 -32768 C700 0000
Table 2.11: Reference/feedback values
The reference/feedback value is the percentage of the range of parameter 3-02 and 3-03. Values
within the ranges 100% to 200% and -200% to -100% applies only to the reference. The Float
representation of the value 200% must be limited to maximum 32767 and minimum -32768.
VLT
®
HVAC Drive Metasys N2 2. Instructions
MG.11.G1.02 - VLT®is a registered Danfoss trademark 19
2

2.2.3. Status Update Request
A Status Update Request will cause the drive to report its current operating status. The status
codes, descriptions and associated alarms are shown in the chart below.
The Device Status Code consists of two parts. The Least Significant Byte, (LSB) of the hex number
is the Alarm Number. The Most Significant Byte (MSB) indicates if the alarm is a normal trip (01)
that can be reset automatically or manually, or if the alarm is a trip lock (02) requiring cycling
power to the drive.
Status codes with associated alarms and
descriptions
Device Status Code1 Alarm
No. Description
0x0000 -Device OK
0x0102 2Live zero error
0x0204 4Phase fault (Trip lock)
0x0107 7Over voltage
0x0108 8Under voltage
0x0109 9Inverter overloaded
0x010A 10 Motor overloaded
0x010B 11 Motor thermistor
0x010C 12 Current limit
0x020D 13 Over current (Trip lock)
0x020E 14 Earth fault (Trip lock)
0x020F 15 Switch mode fault (Trip lock)
0x0210 16 Short circuit (Trip lock)
0x0111 17 Standard bus time out
0x0112 18 HPFB time out
0x0116 22 Auto optimization not OK
0x021D 29 Heat sink temperature to high (Trip
lock)
0x011E 30 Motor phase U missing
0x011F 31 Motor phase V missing
0x0120 32 Motor phase W missing
0x0122 34 Profibus communication error
0x0225 37 Inverter fault (Trip lock)
0x013C 60 Safety interlock
0x0263 99 Unknown fault (Trip lock)
Read / Write Notes
A write command to an ADF (Internal Floating Point) or BD (Internal Byte) point type will be stored
in the drive's EEPROM.
NB!
If write command is issued to an overridden point, the new value will not be stored
in the drive's EEPROM.
2. Instructions VLT
®
HVAC Drive Metasys N2
20 MG.11.G1.02 - VLT®is a registered Danfoss trademark
2