Danfoss VLT series Design Guide

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.

Danfoss VLT series Specifications

General

Series	VLT
Category	DC Drives
Output Voltage	0-100% of input voltage
Protection Features	Overvoltage, Undervoltage, Overcurrent, Overtemperature, Short Circuit, Ground Fault
Communication Interfaces	Profibus, CANopen
Enclosure Rating	IP20, IP21, IP55, IP66
Cooling Method	Forced Air Cooling, Convection Cooling
Control Mode	Sensorless Vector, Closed Loop Vector
Ambient Temperature	-10°C to +50°C (14°F to 122°F)