Danfoss VLT series Guide

Contents

1. How to Read this Design Guide

Approvals 6

Symbols 6

Abbreviations 7

Definitions 7

2. Introduction to the VLT HVAC Drive

Disposal Instructions 14

CE labeling 16

Air humidity 18

Aggressive Environments 18

Vibration and shock 19

VLT HVAC Controls 33

PID 35

General aspects of EMC 47

Galvanic isolation (PELV) 50

Ground leakage current 51

Control with brake function 51

Mechanical brake control 53

Extreme running conditions 53

3. VLT HVAC Selection

Specifications 55

Efficiency 66

Special Conditions 68

Purpose of derating 68

Automatic adaptations to ensure performance 71

Options and Accessories 74

Analog I/O option MCB 109 80

4. How to Order

Ordering form 85

Type Code String 86

Ordering Numbers 87

5. How to Install

VLT

HVAC Drive Design Guide Contents

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

Mechanical Installation 93

Accessory Bag 93

Electrical Installation 95

Removal of Knockouts for Extra Cables 95

Access to Control Terminals 103

Electrical Installation, Control Terminals 104

Final Set-Up and Test 108

Additional Connections 110

Installation of misc. connections 114

Safety 117

EMC-correct Installation 118

AC Line Supply Interference/Harmonics 122

Residual Current Device 122

6. Application Examples

125

Start/Stop 125

Pulse Start/Stop 125

Potentiometer Reference 126

Automatic Motor Adaptation (AMA) 126

Smart Logic Control 127

Smart Logic Control Programming 127

SLC Application Example 127

BASIC Cascade Controller 129

Pump Staging with Lead Pump Alternation 130

System Status and Operation 131

Fixed Variable Speed Pump Wiring Diagram 132

Lead Pump Alternation Wiring Diagram 132

Cascade Controller Wiring Diagram 133

Start/Stop conditions 133

7. RS-485 Installation and Set-up

135

RS-485 Installation and Set-up 135

FC Protocol Overview 138

Network Configuration 139

FC Protocol Message Framing Structure 139

Examples 145

Modbus RTU Overview 146

Contents VLT

HVAC Drive Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

Modbus RTU Message Framing Structure 147

How to Access Parameters 152

Examples 153

Danfoss FC Control Profile 160

8. Troubleshooting

167

Alarms and warnings 167

Index

173

VLT

HVAC Drive Design Guide Contents

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

1. How to Read this Design Guide VLT

HVAC Drive Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

1. How to Read this Design Guide

1.1.1. Copyright, Limitation of Liability and Revision Rights

This publication contains information proprietary to Danfoss A/S. By accepting and using this

manual, the user agrees that the information contained herein will be used solely for operating

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

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

lication is protected under the copyright laws of Denmark and most other countries.

Danfoss A/S does not guarantee 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 A/S has tested and reviewed the documentation within this manual,

Danfoss A/S makes no warranty or representation, neither expressed nor implied, with respect to

this documentation, including its quality, performance or fitness for a particular purpose.

In no event shall Danfoss A/S be liable for direct, indirect, special, incidental or consequential

damages arising from the use or the inability to use information contained in this manual, even if

advised of the possibility of such damages. In particular, Danfoss A/S is not responsible for any

costs, including, but not limited to, those incurred as a result of lost profits or revenue, loss of or

damages to equipment, loss of computer programs, loss of data, the costs to substitute these, or

any claims by third parties.

Danfoss A/S reserves the right to revise this publication at any time and to make changes to its

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

or changes.

1.1.2. AvailableLiterature

Available literature for VLT HVAC Drive

-Instruction Manual MG.11.Ax.yy provides the necessary information for getting the drive

up and running.

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

customer design and applications.

-Programming Guide MG.11.Cx.yy provides information on how to program and includes

complete parameter descriptions.

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

-VLT

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

-Instruction Manual VLT

HVAC Drive BACnet, MG.11.Dx.yy

-Instruction Manual VLT

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

-Instruction Manual VLT

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

-Instruction Manual VLT

HVAC Drive LonWorks, MG.11.Ex.yy

-Instruction Manual VLT

HVAC Drive Metasys, MG.11.Gx.yy

VLT

HVAC Drive Design Guide 1. How to Read this Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

x = Revision number

yy = Language code

Danfoss Drives technical literature is also available online at

www.danfoss.com/BusinessAreas/

DrivesSolutions/Documentations/Technical+Documentation

1.1.3. Approvals

1.1.4. Symbols

Symbols used in this guide.

NOTE

Indicates something to be noted by the reader.

Indicates a general warning.

Indicates a high-voltage warning.

*Indicates default setting

1. How to Read this Design Guide VLT

HVAC Drive Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

1.1.5. Abbreviations

Alternating current AC

American wire gauge AWG

Ampere/AMP A

Automatic Motor Adaptation AMA

Current limit ILIM

Degrees Celsius °C

Direct current DC

Drive Dependent D-TYPE

Electro Magnetic Compatibility EMC

Electronic Thermal Relay ETR

drive FC

Gram g

Hertz Hz

Kilohertz kHz

Local Control Panel LCP

Meter m

Millihenry Inductance mH

Milliampere mA

Millisecond ms

Minute min

Motion Control Tool MCT

Nanofarad nF

Newton Meters Nm

Nominal motor current IM,N

Nominal motor frequency fM,N

Nominal motor power PM,N

Nominal motor voltage UM,N

Parameter par.

Protective Extra Low Voltage PELV

Printed Circuit Board PCB

Rated Inverter Output Current IINV

Revolutions Per Minute RPM

Second s

Torque limit TLIM

Volt V

1.1.6. Definitions

Drive:

VLT,MAX

The maximum output current.

VLT,N

The rated output current supplied by the adjustable frequency drive.

VLT, MAX

The maximum output voltage.

Input:

Control command

You can start and stop the connected motor using

the LCP and the digital inputs.

Functions are divided into two groups.

Functions in group 1 have higher priority than

functions in group 2.

Group 1 Reset, Coasting stop, Reset and Coasting

stop, Quick stop, DC braking, Stop and the

"Off" key.

Group 2 Start, Pulse start, Reversing, Start reversing,

Jog and Freeze output

VLT

HVAC Drive Design Guide 1. How to Read this Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

Motor:

JOG

The motor frequency when the jog function is activated (via digital terminals).

The motor frequency.

MAX

The maximum motor frequency.

MIN

The minimum motor frequency.

M,N

The rated motor frequency (nameplate data).

The motor current.

M,N

The rated motor current (nameplate data).

M,N

The rated motor speed (nameplate data).

M,N

The rated motor power (nameplate data).

M,N

The rated torque (motor).

The instantaneous motor voltage.

M,N

The rated motor voltage (nameplate data).

1. How to Read this Design Guide VLT

HVAC Drive Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

Break-away torque

VLT

The efficiency of the adjustable frequency drive is defined as the ratio between the power output

and the power input.

Start-disable command

A stop command belonging to the group 1 control commands - see this group.

Stop command

See Control commands.

References:

Analog Reference

A signal transmitted to the analog inputs 53 or 54 can be voltage or current.

Bus Reference

A signal transmitted to the serial communication port (FC port).

Preset Reference

A defined preset reference to be set from -100% to +100% of the reference range. Selection of

eight preset references via the digital terminals.

Pulse Reference

A pulse frequency signal transmitted to the digital inputs (terminal 29 or 33).

Ref

MAX

Determines the relationship between the reference input at 100% full scale value (typically 10 V,

20 mA) and the resulting reference. The maximum reference value set in par. 3-03.

Ref

MIN

Determines the relationship between the reference input at 0% value (typically 0 V, 0 mA, 4 mA)

and the resulting reference. The minimum reference value set in par. 3-02.

Miscellaneous:

Analog Inputs

The analog inputs are used for controlling various functions of the adjustable frequency drive.

VLT

HVAC Drive Design Guide 1. How to Read this Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

There are two types of analog inputs:

Current input, 0-20 mA and 4-20 mA

Voltage input, 0-10 V DC.

Analog Outputs

The analog outputs can supply a signal of 0-20 mA, 4-20 mA, or a digital signal.

Automatic Motor Adaptation, AMA

AMA algorithm determines the electrical parameters for the connected motor at standstill.

Brake Resistor

The brake resistor is a module capable of absorbing the braking energy generated in regenerative

braking. This regenerative braking energy increases the intermediate circuit voltage, while a brake

chopper ensures that the energy is transmitted to the brake resistor.

CT Characteristics

Constant torque characteristics used for screw and scroll refrigeration compressors.

Digital Inputs

The digital inputs can be used for controlling various functions of the adjustable frequency drive.

Digital Outputs

The drive features two solid state outputs that can supply a 24 V DC (max. 40 mA) signal.

DSP

Digital Signal Processor.

Relay Outputs:

The adjustable frequency drive features two programmable relay outputs.

ETR

Electronic Thermal Relay is a thermal load calculation based on present load and time. Its purpose

is to estimate the motor temperature.

GLCP:

Graphical Local Control Panel (LCP102)

Initializing

If initializing is carried out (par. 14-22), the programmable parameters of the adjustable frequency

drive return to their default settings.

Intermittent Duty Cycle

An intermittent duty rating refers to a sequence of duty cycles. Each cycle consists of an on-load

and an off-load period. The operation can be either a periodic or non-periodic duty.

1. How to Read this Design Guide VLT

HVAC Drive Design Guide

MG.11.B4.22 - VLT®is a registered Danfoss trademark.

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