Danfoss VLT HVAC Drive Metasys N2 User manual

MAKING MODERN LIVING POSSIBLE
Operating Instructions
Metasys N2
VLT® HVAC Drive FC 102
VLT® AQUA Drive FC 202

Contents
1 Overview 2
1.1.1 Software Version 2
1.1.2 Introduction 2
1.1.3 About this Manual 2
1.1.4 References 2
2 Instructions 3
2.1.1 Abbreviations and Definitions 3
2.1.2 Network Connection 3
2.1.3 Hardware Set-up 3
2.1.5 VLT Parameters 4
3 Appendix 18
3.1.1 Analog Inputs (AI) 18
3.1.2 Binary Inputs (BI) 19
3.1.3 Analog Outputs (AO) 23
3.1.4 Binary Outputs (BO) 24
3.1.5 Internal Floating Point (ADF) 25
3.1.6 Internal Integers (ADI) 27
Index 29
Contents VLT®Metasys
MG.11.G2.02 - VLT®is a registered Danfoss trademark 1

1 Overview
1.1.1 Software Version
VLT HVAC Drive
FC 102 Series
Software version: 3.4x
and VLT AQUA Drive FC 202 Series
Software version: 1.7x
This guide can be used with all VLT HVAC Drive frequency converters with
software version 3.4x and VLT AQUA Drive frequency converters with
software version 1.7x.
The actual software version number can be read from
par. 15-43 Software Version.
1.1.2 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 Instructions, MG.11.Ax.yy or the VLT
AQUA Drive Operating Instructions, MG.20.Mx.yy.
1.1.3 About this Manual
This manual is for both instructional and for reference
purposes. This manual can also serve as aguideline when you
specify and optimize your communication system.
It is highly recommended that you read this manual in its
entirety before initiating any programming. 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.
1.1.4 References
In addition to this manual, the following two manuals should
be consulted: VLT HVAC Drive Operating Instructions, MG.
11.Ax.yy, VLT AQUA Drive Operating Instructions, MG.20.Mx.yy
and Johnson Controls METASYS N2 System Protocol Specification
for Vendors, Johnson Controls number 04-3402-22, rev A.
Overview VLT®Metasys
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2 Instructions
2.1.1 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
FC Frequency Converter
HPFB High Performance Field Bus
JCI Johnson Controls Inc. developers of the METASYS N2 protocol
N2 METASYS N2
N2
mast
er
AN2 master is either aPC with JCI software or adedicated 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 shielded twisted-pair cables to reduce
the differential mode interference between the conductors.
Danfoss do not take any responsibility for consequences, if
unshielded or untwisted cables are used.
Torque Specifications: 4.5 in.lb. (0.5 Nm) if screw terminal is used
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 RS-485 standardized interface.
Terminal 68 is connected to the P signal (TX+, RX+), while
terminal 69 is connected to the Nsignal (TX-,RX-). If more than
one frequency converter is connected to amaster, use parallel
connections.
130BA060.11
68 69 68 69 68 69
RS 485
RS 232
USB
+
-
1 2
S801
ON
130BA272.11
Illustration 2.1: Bus termination switch
NOTE
The factory setting for the dip switch is OFF.
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 RS-485 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.
Instructions VLT®Metasys
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2.1.4 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 2bit 6"Current State" on aBO 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 VLT HVAC Drive
Design Guide, MG.11.Bx.yy, or VLT AQUA Drive Design Guide, MG.20.Nx.yy, for the frequency converter for programming.
Parameter list
VLT 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 1 1-255
8-32 Baud Rate 9600 Fixed to 9600
8-33 Parity Even, 1stop Fixed to No Parity, 1stop
8-37 Maximum Inter-char Delay 25 s for Metasys N2
Instructions VLT®Metasys
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2.1.6 General Commands (Acknowledged)
VLT Response Command Subcommand NPA Object
no. Attribute Message 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 Message -
Slave device must respond with device
manufacturing model number (Par. 6-21),
days in service (Par. 6-00) and device
status
ACK F - - Identify Device Type -
Slave device responds with an identifica-
tion number of 10H to indicate non JCI
device
ACK 0 0 - Synch Time - The internal clock is syncronized by this
command
ACK, no action 8 0 - Upload - Optional, no support in the frequency
converter
ACK, no action 8 1 - Upload - Optional, no support in the frequency
converter
ACK, no action 8 3 - Upload Record - Optional, no support in the frequency
converter
ACK, no action 8 4 - Upload Complete - Optional, no support in the frequency
converter
ACK, no action 9 0 - Download - Optional, no support in the frequency
converter
ACK, no action 9 1 - Download - Optional, no support in the frequency
converter
ACK, no action 9 3 - Download - Record optional, no support in the
frequency converter
ACK, no action 9 4 - Download Complete - Optional, no support in the frequency
converter
NAK 0 1 - Read Memory 01 Slave device memory read based on
memory addresses
NAK 0 8 - Warm Start 01 JCI use only
Instructions VLT®Metasys
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2.1.7 Analog Input Commands (Acknowledged)
VLT
Response
Command Subcom-
mand Region NPA Object no.
Attribute
No. Attribute Message Type Comments
ACK 1 - 1 0-23 1 Byte Read Analog
Input
Read Object Configuration attribute
associated with each individual point
ACK 1 - 1 0-23 2 Byte Read Analog
Input
1) Read Object Status attribute
associated with each individual point
ACK 1 - 1 0-23 3 Float Read Analog
Input
2) Read Analog Input Value attribute
associated with each individual point
ACK 1 - 1 0-23 8 Float Read Analog
Input
Read Low Alarm attribute associated
with each individual point
ACK 1 - 1 0-23 9 Float Read Analog
Input
Read Low Warning attribute associ-
ated with each individual point
ACK 1 - 1 0-23 10 Float Read Analog
Input
Read High Warning attribute associ-
ated with each individual point
ACK 1 - 1 0-23 11 Float Read Analog
Input
Read High Alarm attribute associated
with each individual point
ACK 1 - 1 0-23 12 Float Read Analog
Input
Read Differential attribute associated
with each individual point
ACK 2 - 1 0-23 1 Byte Write Analog
Input
Write to Object Configuration attrib-
ute associated with each individual
point
ACK 2 - 1 0-23 8 Float Write Analog
Input
Write to Low Alarm Limit attribute
associated with each individual point
ACK 2 - 1 0-23 9 Float Write Analog
Input
Write to Low Warning Limit attribute
associated with each individual point
ACK 2 - 1 0-23 10 Float Write Analog
Input
Write to High Warning Limitattribute
associated with each individual point
ACK 2 - 1 0-23 11 Float Write Analog
Input
Write to High Alarm Limit attribute
associated with each individual point
ACK 2 - 1 0-23 12 Float Write Analog
Input
Write to Differential attribute associ-
ated with each individual point
ACK, no
action 7 2 1 0-23 - Float Override Analog inputs
Analog inputs are "outputs" from the
frequency converter and should not
be written over by the network
controller
ACK, no
action 7 3 1 0-23 - - Override Analog Release
Analog inputs are "outputs" from the
frequency converter and should not
be written over by the network
controller
ACK, no
action 7 7 1 0-23 - -
Write Analog
Input Attrib-
utes
Optional command for slave devices.
Only used for N2
commissioning purposes
Instructions VLT®Metasys
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2.1.8 Analog Input Commands (Not Acknowledged)
VLT
Response
Comm and Region NPA Object no. Attribute
No.
Attribute Message Type Error
Code
Comments
NAK 1 1 0-23 4 Float Read Analog
Input
111 ) Read Linear Ranging Parameter 1
attribute associated with each
individual point. (JCI use only)
NAK 1 1 0-23 5 Float Read Analog
Input
111) Read Linear Ranging Parameter 2
attribute associated with each
individual point. (JCI use only)
NAK 2 - 0-23 2 Byte Write Analog
Input
111) Object Status writeable
NAK 2 - 0-23 3 Float Write Analog
Input
111) Analog Input Value not writeable
NAK 2 - 0-23 4 Float Write Analog
Input
111) Write to Linear Ranging Parame-
ter 1 attribute associated with
each individual point. (JCI use
only)
NAK 2 - 0-23 5 Float Write Analog
Input
111) Write to Linear Ranging Parame-
ter 2 attribute associated with
each individual point. (JCI use
only)
NAK 2 - 0-23 6 Float Write Analog
Input
111) Write to Linear Ranging Parame-
ter 3 attribute associated with
each individual point. (JCI use
only)
NAK 2 - 0-23 7 Float Write Analog
Input
111) Write to Linear Ranging Parame-
ter 4 attribute associated with
each individual point. (JCI use
only)
NAK 2 - 0-23 13 Integer Write Analog
Input
111) Write to Filter Weight attribute
associated with each individual
point. (JCI use only)
NAK 2 - 0-23 14 Float Write Analog
Input
111) Write to AI Offset attribute associ-
ated 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.
Instructions VLT®Metasys
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2.1.9 Analog Output Commands (Acknowledged)
VLT
Response
Command Sub
command
Region NPA Object no. Attribute
No.
Attribute Message Type Comments
ACK 1 - 3 0-2 1 Byte Read Analog
Output
Read Object Configuration
attribute associated with each
individual point
ACK 1 - 3 0-2 2 Byte Read Analog
Output
Read Object Status attribute
associated with each individual
point
ACK 0 9 - - - - Status update
Message
Slave device must respond
with device manufacturing
model number (Par. 6-21), days
in service (Par. 6-00) and
device status
ACK 1 - 3 0-2 3 Float Read Analog
Output
Read Current Value attribute
associated with each individual
point
ACK 2 - 3 0-2 1 Byte Write Analog
Output
Write to Object Configuration
attribute associated with each
individual point
ACK 7 2 3 0-2 - Float Override Analog
Output
Write to analog output current
value (frequency setpoint)
ACK 7 2 3 0-2 - Float Override Analog
Output
Write to analog output current
value (frequency setpoint)
ACK 7 3 3 0-2 - - Override Release Set the current value, the value
that it was before the 1.
Override Command was issued
ACK, no
action
7 7 3 0-2 - - Write Analog
Output
Optional command for slave
devices. Only used for N2
Attributes commissioning
purposes. Not to be implemen-
ted at this time
ACK, no
action
7 8 3 0-2 - - Read Analog
Output Attributes
Optional command for no
action slave devices. Only used
for N2 commissioning
purposes. Not to be implemen-
ted at this time
Instructions VLT®Metasys
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2.1.10 Analog Output Commands (Not Acknowledged)
VLT
Response
Command Region NPA Object
no.
Attribute
No.
Attribute Message Type Error
Code
Comments
0-2 1 3 0-2 4 Float Read Analog
Output
111Read Low Linear Ranging
Parameter attribute associated
with each individual point. (JCI
use only)
NAK 1 3 0-2 5 Float Read Analog
Output
111Read High Linear Ranging Para-
meter attribute associated with
each individual point. (JCI use
only)
NAK 2 3 0-2 2 Byte Write Analog
Output
111Object Status not writeable
NAK 2 3 0-2 3 Float Write Analog
Output
111Write to Current Value structure
attributes associated with each
individual point. (N2 does not
support this, override function
must be used)
NAK 2 3 0-2 4 Float Write Analog
Output
111Write Debouncing Value in msec
attribute associated with each
individual point.(JCI use only)
NAK 2 3 0-2 5 Float Write Analog
Output
111Write Accumulator value attrib-
ute associated with each individ-
ual point. (JCI use only)
1) Error code 11 is used because attributes are considered as fields/records in the point map database.
Instructions VLT®Metasys
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