Danfoss VLT HVAC

Start/Stop 119
Pulse Start/Stop 119
Potentiometer Reference 120
Automatic Motor Adaptation (AMA) 120
Smart Logic Control 120
Smart Logic Control Programming 121
SLC Application Example 121
BASIC Cascade Controller 123
Pump Staging with Lead Pump Alternation 124
System Status and Operation 124
Fixed Variable Speed Pump Wiring Diagram 125
Lead Pump Alternation Wiring Diagram 125
Cascade Controller Wiring Diagram 126
Start/Stop conditions 126
7 RS-485 Installation and Set-up 129
RS-485 Installation and Set-up 129
FC Protocol Overview 131
Network Configuration 131
FC Protocol Message Framing Structure 132
Examples 137
Modbus RTU Overview 138
Modbus RTU Message Framing Structure 139
How to Access Parameters 143
Examples 144
Danfoss FC Control Profile 150
8 General Specifications and Troubleshooting 155
Mains Supply Tables 155
General Specifications 169
Efficiency 173
Acoustic Noise 174
Peak Voltage on Motor 174
Special Conditions 179
Troubleshooting 181
Alarms and Warnings 181
Alarm Words 185
Warning Words 186
Extended Status Words 187
Fault Messages 188
Index
194
Contents VLT
®
HVAC Drive Design Guide
2 MG.11.B9.02 - VLT
®
is a registered Danfoss trademark