Danfoss VLT series Guide

Contents
1. How to Read this Design Guide
5
Copyright, Limitation of Liability and Revision Rights 5
Approvals 6
Symbols 6
Abbreviations 7
Definitions 7
2. Introduction to the VLT HVAC Drive 13
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 55
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 85
Ordering form 85
Type Code String 86
Ordering Numbers 87
5. How to Install 93
VLT
®
HVAC Drive Design Guide Contents
MG.11.B4.22 - VLT®is a registered Danfoss trademark. 1

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
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
2 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. 3

1. How to Read this Design Guide VLT
®
HVAC Drive Design Guide
4 MG.11.B4.22 - VLT®is a registered Danfoss trademark.
1

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. 5
1

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
6 MG.11.B4.22 - VLT®is a registered Danfoss trademark.
1

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:
I
VLT,MAX
The maximum output current.
I
VLT,N
The rated output current supplied by the adjustable frequency drive.
U
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. 7
1

Motor:
f
JOG
The motor frequency when the jog function is activated (via digital terminals).
f
M
The motor frequency.
f
MAX
The maximum motor frequency.
f
MIN
The minimum motor frequency.
f
M,N
The rated motor frequency (nameplate data).
I
M
The motor current.
I
M,N
The rated motor current (nameplate data).
n
M,N
The rated motor speed (nameplate data).
P
M,N
The rated motor power (nameplate data).
T
M,N
The rated torque (motor).
U
M
The instantaneous motor voltage.
U
M,N
The rated motor voltage (nameplate data).
1. How to Read this Design Guide VLT
®
HVAC Drive Design Guide
8 MG.11.B4.22 - VLT®is a registered Danfoss trademark.
1

Break-away torque
η
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. 9
1

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
10 MG.11.B4.22 - VLT®is a registered Danfoss trademark.
1