Specifications

7.8.1 Frequency Converter with Modbus RTU 170
7.8.2 Modbus RTU Message Structure 170
7.8.3 Start/Stop Field 171
7.8.4 Address Field 171
7.8.5 Function Field 171
7.8.6 Data Field 171
7.8.7 CRC Check Field 171
7.8.8 Coil Register Addressing 171
7.8.9 How to Control the Frequency Converter 173
7.8.10 Function Codes Supported by Modbus RTU 173
7.8.11 Modbus Exception Codes 174
7.9 Parameter Access
174
7.9.1 Parameter Handling 174
7.9.2 Storage of Data 174
7.9.3 IND 174
7.9.4 Text Blocks 174
7.9.5 Conversion Factor 174
7.9.6 Parameter Values 174
7.10 Examples
174
7.10.1 Read Coil Status (01 HEX) 175
7.10.2 Force/Write Single Coil (05 HEX) 175
7.10.3 Force/Write Multiple Coils (0F HEX) 175
7.10.4 Read Holding Registers (03 HEX) 176
7.10.5 Preset Single Register (06 HEX) 176
7.10.6 Preset Multiple Registers (10 HEX) 177
7.11 Danfoss FC Control Profile
178
8 General Specifications and Troubleshooting
183
8.1 General Specifications
183
8.1.1 Mains Supply 3x380-480 V AC 183
8.1.2 Mains Supply 3x525-690 V AC 185
8.1.3 12-Pulse Specifications 188
8.2 Efficiency
194
8.3 Acoustic Noise
194
8.4 Peak Voltage on Motor
195
8.5 Special Conditions
196
8.5.1 Purpose of Derating 196
8.5.2 Derating for Ambient Temperature 196
8.5.3 Automatic Adaptations to Ensure Performance 197
8.5.4 Derating for Low Air Pressure 197
8.5.5 Derating for Running at Low Speed 198
Contents VLT® HVAC Drive FC 102 Design Guide
6 MG16C102 - Rev. 2013-08-20