Danfoss VLT Metasys Operating guide

Contents

VLT® Metasys

1 Overview

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

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

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

MG.11.G2.02 - VLT® is a registered Danfoss trademark 1

Overview

VLT® Metasys

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 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 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.

References

1.1.4

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.

2 MG.11.G2.02 - VLT® is a registered Danfoss trademark

130BA060.11

68 69 68 69 68 69

RS 485

RS 232 USB

1 2

S801

130BA272.11

Instructions

VLT® Metasys

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

A N2 master is either a PC with JCI software or a dedicated JCI

mast

controller er 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

2.1.3 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 N signal (TX-,RX-). If more than one frequency converter is connected to a master, use parallel connections.

Illustration 2.1: Bus termination switch

2 2

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: Control wire: 18 - 24 AWG, shielded, twisted pair

4.5 in.lb. (0.5 Nm) if screw terminal is used

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.

MG.11.G2.02 - VLT® is a registered Danfoss trademark 3

Instructions

2.1.4 Error Codes

VLT® Metasys

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 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

4 MG.11.G2.02 - VLT® is a registered Danfoss trademark

Instructions

VLT® Metasys

2.1.6 General Commands (Acknowledged)

VLT Response Command Subcommand

ACK 0 4 -

ACK 0 5 -

ACK 0 9 - Status update Message -

ACK F - - Identify Device Type -

ACK 0 0 - Synch Time -

ACK, no action 8 0 - Upload -

ACK, no action 8 1 - Upload -

ACK, no action 8 3 - Upload Record -

ACK, no action 8 4 - Upload Complete -

ACK, no action 9 0 - Download -

ACK, no action 9 1 - Download -

ACK, no action 9 3 - Download -

ACK, no action 9 4 - Download Complete -

NAK 0 1 - Read Memory 01

NPA Object

no.

Attribute Message Type Error Code Comments

Poll Message

No Acknowledge

Poll message

With Acknowledge

The slave is to respond with any data

points, analog or binary I/O that have

been flagged for COS The slave is to respond with any data points, analog or binary I/O that have

been flagged for COS

Slave device must respond with device

manufacturing model number (Par. 6-21),

days in service (Par. 6-00) and device

status

Slave device responds with an identifica-

tion number of 10H to indicate non JCI

device

The internal clock is syncronized by this

command